Abstract:
A voltage converter circuit, includes: a power switch for generating a pulse-width-modulation (PWM) signal to drive a current load, wherein the PWM signal toggles between a first level and a second level; a sensing pin, receiving a first sensing signal when the PWM signal is at the first level, and receiving a second sensing signal when the PWM signal is at the second level; a parameter sampling and setting unit, having an input terminal coupling to the sensing pin, generating a default current or a default voltage on the sensing pin and sampling the second sensing signal to generate a sampling signal when the PWM signal is at the second level, and holding the sampling signal to set a parameter of the voltage converter circuit when the PWM signal is at the first level.

Description:
BACKGROUND 
       [0001]    1. Technical Field 
         [0002]    This disclosure relates to a photoelectric conversion device, especially to a device performing a conversion between an optical and an electric signal. 
         [0003]    2. Description of Related Art 
         [0004]    As the demand on data transmission quantity and transmission rate are increasing, the old-fashioned way of transmitting data with bronze wires is insufficient for nowadays requirements. In recent years, the high-speed data transmission by optical fibers has been a major trend. In the infrastructure of optical fiber transmission, optical engines are indispensable to perform a conversion between an optical signals and electrical signals, while the method of assembling and the efficiency of photo-coupling of an optical engine had been constantly improved to lower cost and enhance the performance. The following references are referred for understanding the prior arts of the skill: U.S. Pat. Nos. 5,684,902, 6,234,687, 6,676,302; US patent application number 20030103735, 20040264884; China patent number CN1288465C, CN201903673U. 
       SUMMARY 
       [0005]    In view of above problems, this disclosure provides an optical engine which is easy for assembling, with high optical-coupling efficiency and decreased optical path compared to the prior arts. 
         [0006]    In the first embodiment, an optical engine including a fiber joint, a fiber pad, a lens set and a photoelectric module is disclosed. The fiber joint has a fiber installation part and an optical signal output part. The fiber installation part is for accommodating a plurality of fibers. The optical signal output part includes a plurality of fiber positioning through holes each positions one of the plurality of fibers with one terminal and outputs an optical signal of the corresponding fiber with the other terminal. The fiber pad is disposed on the fiber installation part and has a plurality of fiber guiding grooves which respectively guide the plurality of fibers to the corresponding fiber positioning through holes. The lens set is coupled to the fiber joint and has an optical signal input side, an optical signal output side, a plurality of first lenses and a plurality of second lenses. The plurality of first lenses are disposed on the optical signal input side for receiving the optical signals coming from the plurality of optical positioning through holes. The plurality of second lenses are disposed on the optical signal output side for outputting the optical signals originated from the plurality of first lenses. The photoelectric module is coupled to the lens set and has a plurality of photoelectric components for converting the optical signals coming from the plurality of second lenses into electric signals. 
         [0007]    In the second embodiment, an optical engine including a fiber joint, a fiber pad and a photoelectric module is disclosed. The fiber joint has a fiber installation part and an optical signal output part. The fiber installation part is for accommodating a plurality of fibers. The optical signal output part includes a plurality of fiber positioning through holes each positions one of the plurality of fibers with one terminal and outputs an optical signal of the corresponding fiber with the other terminal. The fiber pad is disposed on the fiber installation part and has a plurality of fiber guiding grooves which respectively guide the plurality of fibers to the corresponding fiber positioning through holes. The photoelectric module is assembled to the fiber joint and has a plurality of photoelectric components for converting the optical signals coming from the plurality of fiber positioning through holes into electric signals. 
         [0008]    In the third embodiment, an optical engine including a fiber joint, a lens set and a photoelectric module is disclosed. The fiber joint has a fiber installation part and an optical signal output part. The fiber installation part is for accommodating a plurality of fibers. The optical signal output part includes a plurality of fiber positioning through holes each positions one of the plurality of fibers with one terminal and outputs an optical signal of the corresponding fiber with the other terminal. The lens set is assembled to the fiber joint and has an optical signal input side, an optical signal output side, a plurality of first lenses and a plurality of second lenses. The plurality of first lenses are disposed on the optical signal input side for receiving the optical signals coming from the plurality of optical positioning through holes. The plurality of second lenses are disposed on the optical signal output side for outputting the optical signals originated from the plurality of first lenses. Diameters of the plurality of first lenses are different from those of the plurality of second lenses. The photoelectric module is assembled to the lens set and the fiber joint. The photoelectric module has a plurality of photoelectric components for converting the optical signals coming from the plurality of second lenses into electric signals. 
         [0009]    In the fourth embodiment, an optical engine including a fiber joint, a photoelectric module and a plurality of positioning components is disclosed. The fiber joint includes a fiber installation part and an optical signal output part. The fiber installation part is for accommodating a plurality of fibers. The optical signal output part includes a plurality of fiber positioning through holes and a plurality of positioning hole. Each of the plurality of fiber positioning through holes positions one of the plurality of fibers with one terminal and outputs an optical signal of the corresponding fiber with the other terminal. The photoelectric module is assembled to the fiber joint and includes a plurality of photoelectric components and a plurality of positioning parts. The plurality of photoelectric components is for converting the optical signals coming from the plurality of fiber positioning through holes into electric signals. Each of the plurality of positioning parts has a positioning component guiding groove and a positioning hole. The positioning component guiding groove is for guiding and plugging a positioning component into the positioning hole. The plurality of positioning components is combined with the plurality of positioning holes on the fiber joint and the photoelectric module respectively to assemble the fiber joint and the photoelectric module detachably. The plurality of positioning components are discrete components separated from the fiber joint and the photoelectric module before assembling. 
         [0010]    In the last embodiment, an optical engine including a fiber join, a photoelectric module, a circuit board and a plurality of amplifiers is disclosed. The fiber joint has a fiber installation part and an optical signal output part. The fiber installation is for accommodating a plurality of fibers. The optical signal output part includes a plurality of fiber positioning through holes each positions one of the plurality of fibers with one terminal and outputs an optical signal of the corresponding fiber with the other terminal. The photoelectric module is assembled to the fiber joint and includes a plurality of photoelectric components and a plurality of output conducting lines. The plurality of photoelectric components are disposed on a first surface of the photoelectric module and for converting the optical signals coming from the plurality of fiber positioning through holes into electric signals. The plurality of output conducting lines are bent to be disposed on the first surface and a second surface of the photoelectric module wherein one terminal of each of the plurality of output conducting lines disposed on the first surface and electrically connected to one of the plurality of the photoelectric components, and the other terminal of each of the plurality of output conducting lines disposed on the second surface. The circuit board has a plurality of through holes wherein the fiber joint and the photoelectric module are disposed on a top surface of the circuit board. The plurality of output conducting lines are electrically connected to the circuit board. The plurality of amplifiers are disposed on a bottom surface of the circuit board and electrically connected to the plurality of output conducting lines via the plurality of through holes for receiving and amplifying the electric signals on the plurality of output conducting lines. 
         [0011]    These and other objectives of this disclosure will no doubt become obvious to those of ordinary skill in the art after reading the following detailed description of the preferred embodiments that is illustrated in the various figures and drawings. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0012]      FIG. 1A  is an exploded view of the first embodiment of an optical engine of the present disclosure. 
           [0013]      FIG. 1B  is a perspective view of the first embodiment of an optical engine of the present disclosure. 
           [0014]      FIG. 2A  is a perspective view of an embodiment of a fiber joint of the optical engine in  FIG. 1A  and  FIG. 1B . 
           [0015]      FIG. 2B  is another perspective view of the fiber joint in  FIG. 2A . 
           [0016]      FIG. 2C  is a perspective view of another embodiment of a fiber joint of the optical engine in  FIG. 1A  and  FIG. 1B . 
           [0017]      FIG. 3A  is a perspective view of an embodiment of a fiber pad of the optical engine in  FIG. 1A  and  FIG. 1B . 
           [0018]      FIG. 3B  is another perspective view of the fiber pad in  FIG. 3A . 
           [0019]      FIG. 4A  is a perspective view of an embodiment of an optical signal input side of a lens set in  FIG. 1A  and  FIG. 1B . 
           [0020]      FIG. 4B  is a perspective view of an embodiment of an optical signal output side of the lens set in  FIG. 1A  and  FIG. 1B . 
           [0021]      FIG. 4C  is a side view of the lens set in  FIG. 4A  and  FIG. 4B . 
           [0022]      FIG. 5A  is a perspective view of an embodiment of a photoelectric module in  FIG. 1A  and  FIG. 1B . 
           [0023]      FIG. 5B  is a perspective view of another embodiment of a photoelectric module in  FIG. 1A  and  FIG. 1B . 
           [0024]      FIG. 5C  is another perspective view of the photoelectric module in  FIG. 5A . 
           [0025]      FIG. 5D  is still another perspective view of the photoelectric module in  FIG. 5A . 
           [0026]      FIG. 6A  is a perspective view of an embodiment of an optical engine of the present disclosure including a circuit board. 
           [0027]      FIG. 6B  is a perspective view of the optical engine in  FIG. 6A  including a cover. 
           [0028]      FIG. 7A  is an exploded view of the second embodiment of an optical engine of the present disclosure. 
           [0029]      FIG. 7B  is a perspective view of the second embodiment of an optical engine of the present disclosure. 
           [0030]      FIG. 8A  is an exploded view of the third embodiment of an optical engine of the present disclosure. 
           [0031]      FIG. 8B  is a perspective view of the third embodiment of an optical engine of the present disclosure. 
           [0032]      FIG. 9A  is an exploded view of the fourth embodiment of an optical engine of the present disclosure. 
           [0033]      FIG. 9B  is a perspective view of the fourth embodiment of an optical engine of the present disclosure. 
       
    
    
     DETAILED DESCRIPTION OF THE EMBODIMENTS 
       [0034]      FIG. 1A  and  FIG. 1B  are respectively an exploded view and a perspective view of the first embodiment of an optical engine  100  of the present disclosure. As shown in the figures, the optical engine  100  of the embodiment includes a fiber joint  110 , a fiber pad  120 , a lens set  130  and a photoelectric module  140 . 
         [0035]    The fiber joint  110  has a fiber installation part  112  and an optical signal output part  114 . The fiber installation part  112  is for accommodating a plurality of fibers  116 . The optical signal output part  114  includes a plurality of fiber positioning through holes  118  each positions one of the plurality of fibers  116  when plugging thereto and outputs an optical signal of the corresponding one of the plurality of fibers  116 . 
         [0036]    The fiber pad  120  is disposed on the fiber installation part  112  and has a plurality of fiber guiding grooves  122  which respectively guide the plurality of fibers  116  to the corresponding fiber positioning through holes  118 . 
         [0037]    The lens set  130  is coupled to and assembled to the optical signal output part  114  of the fiber joint  110  for enhancing an efficiency of the optical coupling. The lens set  130  has an optical signal input side  132 , an optical signal output side  134 , a plurality of first lenses  136  and a plurality of second lenses  138  (please refer to  FIG. 4A  and  FIG. 4B ). The plurality of first lenses  136  are disposed on the optical signal input side  132  for receiving the optical signals coming from the plurality of optical positioning through holes  118 . The plurality of second lenses  138  are disposed on the optical signal output side  134  for outputting the optical signals originated from the plurality of first lenses  136 . 
         [0038]    The photoelectric module  140  is coupled to and assembled to the lens set  130  and the fiber joint  110 . The photoelectric module  140  has a plurality of photoelectric components  140 , such as photodiodes, for converting the optical signals coming from the plurality of second lenses  138  to electric signals. 
         [0039]    In this embodiment, the optical engine  100  can further include at a plurality of positioning components  150 , and the optical signal output part  114  of the fiber joint  110 , the lens set  130  and the photoelectric module  140  can respectively include a plurality of positioning holes  152  matching to the plurality of positioning components  150  assembling the fiber joint  110 , the lens set  130  and the photoelectric module  140  detachably. As shown in  FIG. 1A , one terminal of each positioning component  150  is plugged to one of the positioning holes  152  of fiber joint  110 , and the other terminal of each positioning component  150  is plugged to one of the positioning holes  152  of photoelectric module  140  through one of the positioning holes  152  of the lens set  130 . Thus all aforementioned components are assembled together. Note that the plurality of positioning components  150  are discrete components separated from the fiber joint  110 , the lens set  130  and the photoelectric module  140  before assembling. 
         [0040]    It is also noted that though the plurality of positioning components  150  of this embodiment are discrete components, it is not meant to limit the scope of the present disclosure. For example the positioning components  150  can be directly disposed or formed on the fiber joint  110  or the photoelectric module  140  before assembling, or they can be respectively disposed or formed on the fiber joint  110  and the photoelectric module  140  before assembling. Then together with the positioning holes  152  of the lens set  130 , all the fiber joint  110 , the lens set  130  and the photoelectric module  140  are assembled into one piece. 
         [0041]    As shown in  FIG. 1A  and  FIG. 1B , the preceding paragraphs described an operation of the optical engine  100  as a receiving terminal. However the optical engine  100  of this embodiment can also be adopted as a transmitting terminal. As shown in the figures, when the optical engine  100  is adopted as a transmitting terminal, a plurality of photoelectric components  142  of the photoelectric module  140  receive a plurality of electric signals and convert them into a plurality of optical signals outputting to the plurality of second senses  138  of the lens set  130 . Said optical signals are then passed to the plurality of fiber positioning through holes  118  through the second lenses  138  and the first lenses  136 , and respectively coupled to the plurality of fibers  116  positioned by the fiber positioning through holes  118 . Thus the optical signals can be transmitted to a far end through the plurality of fibers  116 . 
         [0042]    Note that it is common knowledge to those skilled in the art that the optical engine  100  of the present disclosure described as a receiving terminal can also be adopted as a transmitting terminal. Thus once the optical engine  100  of the present disclosure as a receiving terminal is clearly described in the following embodiments, the corresponding adoptions as a transmitting terminal will not be described further and can still be fully understand by those skilled in the art. 
         [0043]      FIG. 2A  and  FIG. 2B  are perspective views of an embodiment of the fiber joint  110 . As shown in the figures, the fiber installation part  112  of the fiber joint  110  includes at least one first fixing part  113 , which are two assembling slots in this embodiment, for fixing the fiber pad  120 . The volume, shape and location of the first fixing part  113  shown in this embodiment are not meant to limit the scope of the present disclosure. Those skilled in the art can determine the volume, shape and location of the first fixing part  113  according to different applications after understanding the present disclosure to fix the fiber pad  120  to the fiber installation part  112 . Also note that though the fiber pad  120  is fixed to the fiber joint  110  by the first fixing part  113  in this embodiment, it is not meant to limit the scope of the present disclosure. Other prior arts, such as gluing, screwing and molding, can be adopted in the present disclosure to fix the fiber pad  120  to the fiber joint  110 . 
         [0044]      FIG. 2C  is a perspective view of another embodiment of the fiber joint. As shown in figure, the surface of the fiber joint  200  adopted to assemble and couple to the lens set  130  is an inclined plane  202 . Thus an interference caused by a partial reflection when an optical signal walking through an interface formed on the inclined plane  202  can be alleviated. Also a gap formed by the inclined plane  202  can be adopted to observe the alignment of the photoelectric components  142  and the fibers  116  to determine if an adjustment should be performed. In this embodiment, the inclined plane is formed by mechanical polishing, and an angle theta between the inclined plane and a vertical line is between 1 and 6 degrees wherein 1 and 6 degrees are included. The preferred angle is between 4 and 6 degrees wherein 4 and 6 degrees are included. Besides in this embodiment, both sides of the optical signal output part  114  of the fiber joint  200  can further include a plurality of assembling grooves  172  for assembling to a cover which is adopted for shielding and protection. Note that the way of forming the inclined plane, the design value of the angle theta and the design of the assembling grooves  172  in this embodiment is for illustration purpose but not to limit the scope of the present disclosure. Those skilled in the art can perform equivalent implementations of this embodiment according to the present disclosure. For example the inclined plane  202  can be formed concurrently with the fiber joint  200  by injection molding, or the inclined plane  202  can be formed by performing laser cutting on fiber joint  200 . The inclined plane  202  can be multi-sectional such as bi-sectional. The fiber joint  200  can be assembled to the cover by gluing, screwing or molding instead of by the guiding grooves  172 . 
         [0045]      FIG. 3A  and  FIG. 3B  are perspective views of an embodiment of the fiber pad  120  of the optical engine  100  in  FIG. 1A  and  FIG. 1B . The fiber pad  120  includes at least one second fixing part  121 , which are two assembling tenons in this embodiment, matching to the first fixing part  113  of the fiber installation part  112  on structure to fix the fiber pad  120  to the fiber installation part  112  by assembling the second fixing part  121  to the first fixing part  113 . The volume, shape and location of the second fixing part  121  shown in this embodiment are not meant to limit the scope of the present disclosure. Those skilled in the art can determine the volume, shape and location of the second fixing part  121  matching to the first fixing part  113  according to different applications after understanding the present disclosure. Also note that the fiber pad  120  can be fixed to the fiber joint  110  by other prior arts such as gluing, screwing and molding. 
         [0046]    As shown in  FIG. 3A  and  FIG. 3B , in this embodiment, the lengths of the plurality of fiber guiding grooves  122  of the fiber pad  120  increase or decrease gradually on space. The fiber pad  120  further includes a plurality of separating islands  124  for separating the plurality of fiber guiding grooves  122 . Different angles α can be designed between a plane of each of side walls of the separating islands  124  and a tangent line of the corresponding guiding groove wherein the side walls are at the terminal away from the fiber positioning through holes  118 . The angle α corresponding to the separating islands  120  at the both sides of the fiber pad  120  can be designed larger, for example 8 degrees, while the angle α corresponding to the separating islands  120  in between can be designed smaller, for example 0 degrees. Thus enhance the convenience when installing fibers thereto. Note that the design of increasing or decreasing the lengths of the fiber guiding grooves  112  gradually on space and the design of the angle α, for example in  FIG. 3B  the angles α1, α2, α3, α4, α5 are 8 degrees, 4.5 degrees, 0 degrees, 4.5 degrees and 8 degrees respectively, is not meant to limit the scope of the present disclosure. Those skilled in the art can determine the lengths of the fiber guiding grooves  122  and the angle α according to different applications after understanding the present disclosure. For example the lengths of the plurality of fiber guiding grooves  122  can be all the same or different values for each. The arrangement of the lengths of the plurality of fiber guiding grooves  122  can be increasing or decreasing gradually on space, or be longer or shorter for those at the both sides, or even be arbitrary value for each. The angles α, which can be zero or non-zero, for a part of or all the terminals of the separating islands  124  away from the fiber positioning through holes  118  can be all the same or different values for each. The arrangement of the angles α can be increasing or decreasing gradually on space, or be longer or shorter for those at the both sides, or even be arbitrary value for each. 
         [0047]      FIG. 4A  and  FIG. 4B  are perspective views of an embodiment of the lens set  130  in  FIG. 1A  and  FIG. 1B . In this embodiment, diameters of the plurality of the first lenses  136  are smaller than those of the plurality of the second lenses  138 . That is, the first lenses  136  disposed on the optical signal input side  132  are lens with small diameters while the second lenses  138  disposed on the optical signal output side  134  are lens with large diameters. Besides, the first lenses  136  and the second lenses  138  in this embodiment are aspheric lenses. Thus the efficiency of the optical coupling of the present disclosure can be enhanced up to 50%, and the optical path can be effectively decreased. However the embodiment described in this paragraph is a best mode but not to limit the scope of the present disclosure. Those skilled in the art can design diameters and categories of the lenses according to different applications considering optical path and wavelength after understanding the present disclosure. For example the diameters of the first lenses  136  can be equal to or larger than those of the second lenses  138 . The first lenses  136  and the second lenses  138  can be all spherical lenses, spherical lenses and aspheric lenses respectively, or vice versa. 
         [0048]      FIG. 5A  is a perspective view of an embodiment of the photoelectric module  140  in  FIG. 1A  and  FIG. 1B . In this embodiment the photoelectric module  140  includes a plurality of photoelectric components  142 , a plurality of amplifiers  144  and a plurality of output terminals  146 . The plurality of amplifiers  144  are for amplifying electric signals coming from the plurality of photoelectric components  142  and outputting the amplified signals. The plurality of output terminals  146  are for conducting the amplified signals coming from the amplifiers  144 . Besides, a part of the plurality of amplifiers  144  and the plurality of photoelectric components  142  are disposed on the same plane and electrically connected to each other, and the rest of the plurality of amplifiers  144  are disposed on another plane perpendicular to the plane the photoelectric components  142  disposed thereon and are electrically connected to the photoelectric components  142  by wire-bonding. The photoelectric module  140  further includes a plurality of positioning parts  147  each has a positioning component guiding groove  148  and a positioning hole  152 . The positioning component guiding groove  148  is for guiding and plugging a positioning component, for example the aforementioned independent positioning components  150 ), into the positioning hole  152 . Thus facilitate the assembling and positioning of the related parts. Moreover, the photoelectric module  140  can further comprise a plurality of circuit board positioning parts  149  for fixing the photoelectric module  140  to a circuit board. 
         [0049]    Note that in the prior arts, the amplifiers and the photoelectric module are disposed separately on the same plane of a circuit board. However in the aforementioned embodiment, the amplifiers  144  are disposed directly on the photoelectric module  140  having the photoelectric components  142 . Compared to the prior arts, the distance between the photoelectric components  142  and the amplifier  144  are decreased, thus the noise in high-frequency transmission is alleviated. The photoelectric components  142  and the amplifier  144  can also be electrically connected by wire-bonding and packaged together to lower the transmission loss. Besides, the positioning parts  147  disclosed in the aforementioned embodiment can facilitate the assembling of the optical engine  100  compared to the prior arts. Note that besides fixing the photoelectric module  140  to a circuit board by the circuit board positioning parts  149  as described in the aforementioned embodiment, other methods can also be adopted such as gluing, screwing or molding. 
         [0050]    Also note that though the plurality of amplifiers  144  are disclosed as disposed on two separated planes in the aforementioned embodiment, it is not meant to limit the scope of the present disclosure. For example the plurality of amplifiers  144  can be incorporated into one amplifier module comprising a plurality of amplifying circuits and is disposed on any one of the two said planes. The plurality of amplifiers  144  can also be disposed on only one of the two said planes. 
         [0051]      FIG. 5B ,  FIG. 5C  and  FIG. 5D  are perspective views of another embodiment of the photoelectric module  140  in  FIG. 1A  and  FIG. 1B . The major difference of this embodiment and that of  FIG. 5A  is the structural design of the output terminals  146  of the photoelectric module  140 , the allocation of the amplifiers  144  and the electrical conducting path between the amplifier  144  and the output terminals  146 . As shown in  FIG. 5B , the photoelectric module  140  includes a plurality of photoelectric components  142  and a plurality of output conducting lines  146 . The plurality of photoelectric components  142  are disposed on a first surface  141  of the photoelectric module  140  for converting the optical signals coming from the plurality of fiber positioning through holes  118  into electric signals. The plurality of output conducting lines  146  are bent to be disposed on the first surface  141  and a second surface  143 , such as a bottom surface, of the photoelectric module  140 , wherein one terminal of each of the plurality of output conducting lines  146  is disposed on the first surface  141  and electrically connected to one of the plurality of the photoelectric components  142  while the other terminal of each of the plurality of output conducting lines  146  is disposed on the second surface  143  and electrically connected to a circuit board  160 . The circuit board  160  includes a plurality of through holes (not shown in the figures). The aforementioned fiber joint  110 , the lens set  130  and the photoelectric module  140  are disposed on a top surface  164  of the circuit board  160 . The plurality of output conducting lines  146  are electrically connected to the plurality of through holes of the circuit board  160 . Moreover, a plurality of amplifiers  144  are disposed on a bottom surface  166  of the circuit board  160  at a location closest to or corresponding to the plurality of output conducting lines  146  to minimize the distance of signal transmission. The plurality of amplifiers  144  are electrically connected to the plurality of output conducting lines  146  via the plurality of through holes for receiving and amplifying the electric signals on the plurality that of output conducting lines  146 . 
         [0052]    Note that this embodiment can be applied when the surface of the photoelectric module  140  is not large enough for disposing all amplifiers  144 . Instead of that, all or some of the amplifiers  144  are disposed on the circuit board  160  and by applying the way disclosed in this embodiment, the signal transmission distance between the amplifiers  144  and the photoelectric module  146  can be effectively decreased. In other words, by the structure of the output conducting lines  146  bent along the first surface  141  and the second surface  143  of the photoelectric module  140 , and by allocating the plurality of amplifiers  144  closest to or corresponding to the output conducting lines  146  and electrically connected to them via the through holes of the circuit board  160 , the noise in high-frequency transmission can be alleviated because the distance between the photoelectric components  142  and the amplifiers  144  is decreased compared to the prior arts. Also the design is simplified and the transmission loss is decreased compared to the prior arts. Also note that the positioning parts  147  shown in  FIG. 5A  can be applied in this embodiment to facilitate the assembling of the photoelectric module  140  in the photo engine  100  compared to the prior arts. 
         [0053]    Please refer to  FIG. 5A  again. In this embodiment, each amplifier  144  can further include one or many driving circuits. Thus when the photoelectric module  140  of the optical engine  100  is adopted as a signal transmitter, the driving circuits can send a plurality of electric signals to and drive the photoelectric components  142  to generate a plurality of optical signals accordingly. The plurality of optical signals are sent to the fiber joint  110  through the second lenses  138 , the first senses  136  sequentially, then photo-coupled to the plurality of fibers  116  disposed on the fiber joint  110 . Finally the plurality of optical signals are sent to a far-end terminal through the fibers  116 . Besides, to optimize the transmission rate when considering the transmission distance to the far-end terminal, the amplifiers  144  can be designed as in the following descriptions. The part of the amplifiers  144  disposed on the same plane as the photoelectric components  142  can include one or many high-speed driving circuits to drive the photoelectric components  142  with higher transmission rate when the transmission distance is shorter since this part of the amplifiers  144  are closer to the photoelectric components which induce less transmission loss and less noise in high-frequency transmission. While the rest of the amplifiers  144  disposed on another plane perpendicular to the plane the photoelectric components  142  disposed thereon can include one or many low-speed driving circuits to drive the photoelectric components  142  with lower transmission rate when the transmission distance is longer. The embodiment described in this paragraph is not to limit the scope of the present disclosure. Those skilled in the art can determine the volume and category of the driving circuits designed in the amplifiers according to the practical requirements on applications after understanding the present disclosure. For example each of the amplifiers  144  can include one or many high-speed driving circuits to provide higher transmission rate, or each of the amplifiers  144  can include one or many low-speed driving circuits to provide lower transmission rate. Even only one of the amplifiers  144  includes many high-speed and/or low-speed driving circuits. Besides, those skilled in the art can adopt independent drivers (not shown in the figures) instead of the driving circuits incorporated in the amplifiers  144  and determine the volume, category and allocation of the independent drivers according to the practical requirements on applications after understanding the present disclosure. 
         [0054]    According to the aforementioned embodiments, when the photoelectric components  142  and the driving circuits are disposed on the same plane of the photoelectric module  140 , the distance between both is short thus high-speed transmission can be performed. And when the photoelectric components  142  and the driving circuits are disposed on two different planes of the photoelectric module  140 , the distance between both is longer thus it is preferred to be adopted in low-speed transmission. However in the prior arts, the driving circuits are disposed separately with the photoelectric module  140  with even longer distance between the photoelectric components  142  and the driving circuits. Thus the transmission rate is improved by the present disclosure compared to the prior arts. Note that the amplifiers  144  shown in  FIG. 5B ,  FIG. 5C  and  FIG. 5D  can also include the driving circuits as described in the embodiment of  FIG. 5A . The photoelectric module  140  shown in  FIG. 5B ,  FIG. 5C  and  FIG. 5D  can also adopt independent drivers for driving the photoelectric components  142  to generate a plurality of optical signals when the photoelectric module  140  of the optical engine  100  is adopted as a signal transmitter. 
         [0055]      FIG. 6A  and  FIG. 6B  are perspective views of an embodiment of the optical engine  100  of the present disclosure. The optical engine  100  further includes a circuit board  160  as shown in  FIG. 6A , and a cover  170  as shown in  FIG. 6B , and/or a glue not shown in the figures. The circuit board  160  is for disposing the fiber joint  110 , the lens set  130  and the photoelectric module  140 . The cover  170  and the circuit board  160  forms an accommodating space for accommodating the fiber joint  110 , the fiber pad  120 , the lens set  130  and the photoelectric module  140 . Both sides of the optical signal output part  114  of the fiber joint  110  have a plurality of assembling grooves  172 , shown in  FIG. 6B  and also  FIG. 2C , for assembling to the cover  170 . The glue is for sealing the accommodating space. 
         [0056]      FIG. 7A  is an exploded view of the second embodiment of an optical engine  700  of the present disclosure.  FIG. 7B  is a perspective view of the second embodiment of the optical engine  700  of the present disclosure. The major difference of this embodiment and that of  FIG. 1A  and  FIG. 1B  is that the lens set  130  is not adopted in this embodiment. The optical signals sent by the fiber joint  110  are photo-coupled to photoelectric components  142  directly. As shown in  FIG. 7A  and  FIG. 7B , the optical engine  700  includes a fiber joint  110 , a fiber pad  120  and a photoelectric module  140 . The fiber joint  110  includes a fiber installation part  112  and an optical signal output part  114 . The fiber installation part  112  is for accommodating a plurality of fibers  116 . The optical signal output part  114  includes a plurality of fiber positioning through holes  118  each positions one of the plurality of fibers  116  with one terminal and outputs an optical signal of the corresponding fiber with the other terminal. The fiber pad  120  is disposed on the fiber installation part  112  and includes a plurality of fiber guiding grooves  122  which respectively guide the plurality of fibers  116  to the corresponding fiber positioning through holes  118 . The photoelectric module  140  is assembled to the fiber joint  110  and includes a plurality of photoelectric components  142  for converting the optical signals coming from the plurality of fiber positioning through holes  118  into electric signals. 
         [0057]    Note that the fiber joint  110 , the fiber pad  120  and the photoelectric module  140  described in this embodiment can further include a part of or all the technical characteristics of those described in the aforementioned embodiments. For example the assembling method of the fiber joint  110  and the fiber pad  120 , the determination of the length of the fiber guiding grooves  122  and the design of the photoelectric module  140 . Those skilled in the art can apply a part of or all the technical characteristics of those described in the aforementioned embodiments in this embodiment after understanding the aforementioned embodiments. Thus without effecting the understanding of the present disclosure, the descriptions of applications of these technical characteristics is omitted herein. 
         [0058]      FIG. 8A  is an exploded view of the third embodiment of an optical engine  800  of the present disclosure.  FIG. 8B  is a perspective view of the third embodiment of the optical engine  800  of the present disclosure. The major difference of this embodiment and that of  FIG. 1A  and  FIG. 1B  is that the fiber pad  120  is not adopted in this embodiment. A plurality of fibers  116  are positioned to a plurality of fiber positioning through holes  118  of the fiber joint  110  directly. As shown in  FIG. 8A  and  FIG. 8B , the optical engine  800  includes a fiber joint  110 , a lens set  130  and a photoelectric module  140 . The fiber joint  110  includes a fiber installation part  112  and an optical signal output part  114 . The fiber installation part  112  is for accommodating a plurality of fibers  116 . The optical signal output part  114  includes a plurality of fiber positioning through holes  118  each positions one of the plurality of fibers  116  with one terminal and outputs an optical signal of the corresponding fiber  116  with the other terminal. The lens set  130  is assembled to the fiber joint  110  and includes an optical signal input side  132 , an optical signal output side  134 , a plurality of first lenses  136  and a plurality of second lenses  138  (as also shown in  FIG. 4A ,  FIG. 4B ,  FIG. 4C  and  FIG. 4   d ). The plurality of first lenses  136  are disposed on the optical signal input side  132  for receiving the optical signals coming from the plurality of optical positioning through holes  118 . The plurality of second lenses  138  are disposed on the optical signal output side  134  for outputting the optical signals originated from the plurality of first lenses  136 . Diameters of the plurality of first lenses  136  are different from those of the plurality of second lenses  138 . The photoelectric module  140  is assembled to the lens set  130  and the fiber joint  110 . The photoelectric module  140  includes a plurality of photoelectric components  142  for converting the optical signals coming from the plurality of second lenses  138  into electric signals. 
         [0059]    Note that the fiber joint  110 , the lens set  130  and the photoelectric module  140  described in this embodiment can further include a part of or all the technical characteristics of those described in the aforementioned embodiments. For example the determination of the diameter and category of the first lenses  136  and the second lenses  138 , and the design of the photoelectric module  140 . Those skilled in the art can apply a part of or all the technical characteristics of those described in the aforementioned embodiments in this embodiment after understanding the aforementioned embodiments. Thus without effecting the understanding of the present disclosure, the descriptions of applications of these technical characteristics is omitted herein. 
         [0060]      FIG. 9A  is an exploded view of the fourth embodiment of an optical engine  900  of the present disclosure.  FIG. 9B  is a perspective view of the fourth embodiment of the optical engine  900  of the present disclosure. The major difference of this embodiment and that of  FIG. 1A  and  FIG. 1B  is that the fiber pad  120  and the lens set  130  are not adopted in this embodiment. Instead a plurality of fibers  116  are positioned to a plurality of fiber positioning through holes  118  of the fiber joint  110  directly, and the optical signals sent by the fiber joint  110  are photo-coupled to photoelectric components  142  directly. As shown in  FIG. 9A  and  FIG. 9B , the optical engine  900  includes a fiber joint  110 , a photoelectric module  140  and a plurality of positioning components  150 . The fiber joint  110  includes a fiber installation part  112  and an optical signal output part  114 . The fiber installation part  112  is for accommodating a plurality of fibers  116 . The optical signal output part  114  includes a plurality of fiber positioning through holes  118  and a plurality of positioning hole  152  (as also shown in  FIG. 2A ). Each of the fiber positioning through holes  118  positions one of the plurality of fibers  116  with one terminal and outputs an optical signal of the corresponding fiber  116  with the other terminal. The photoelectric module  140  is assembled to the fiber joint  110  and includes a plurality of photoelectric components  142  and a plurality of positioning parts  147  (as also shown in  FIG. 5A ). The plurality of photoelectric components  142  are for converting the optical signals coming from the plurality of fiber positioning through holes  118  into electric signals. Each of the plurality of positioning parts  147  includes a positioning component guiding groove  148  and a positioning hole  152  (as also shown in  FIG. 5A ). The positioning component guiding groove  148  is for guiding and plugging a positioning component into the positioning hole  152 . The plurality of positioning components  150  are combined with the plurality of positioning holes  152  on the fiber joint  110  and the photoelectric module  140  respectively to assemble the fiber joint  110  and the photoelectric module  140  detachably. The plurality of positioning components  150  are discrete components separated from the fiber joint  110  and the photoelectric module  140  before assembling. 
         [0061]    Note that the fiber joint  110  and the photoelectric module  140  described in this embodiment can further include a part of or all the technical characteristics of those described in the aforementioned embodiments. For example the design of the photoelectric module  140  and the adoption of the discrete positioning components  150 .