Patent ID: 6527454
Filing Date: 2003-03-04
Classification: G02B

Abstract:
An optical module comprising:transmission-light signal emitting means for emitting a transmission-light signal having a first wavelength band; an optical fiber for receiving a reception-light signal having a second wavelength band from an outside and transmitting the transmission-light signal emitted from the transmission-light signal emitting means; an optical waveguide for transmitting the transmission-light signal emitted from the transmission-light signal emitting means and the reception-light signal received by the optical fiber, giving a first travelling direction characteristic corresponding to a first direction to the reception-light signal and outputting the transmission-light signal to the optical fiber to transmit the transmission-light signal to the outside; light transmitting means for receiving the reception-light signal having the first travelling direction characteristic from the optical waveguide and transmitting the reception-light signal; and reception-light signal detecting means for detecting the reception-light signal transmitting through the light transmitting means, wherein the optical waveguide comprises a first core, having a first end facing the transmission-light signal emitting means and a second end extending in a second direction differing from the first direction, for transmitting the transmission-light signal received at the first end, giving a second travelling direction characteristic corresponding to the second direction to the transmission-light signal and outputting the transmission-light signal from the second end; a second core, connected with the second end of the first core at a connection point, for transmitting the reception-light signal; and a main filter, on which the connection point is placed, for reflecting a major portion of the transmission-light signal received at the connection point from the first core to the second core to output the major portion of the transmission-light signal from the optical fiber to the outside, transmitting the remaining portion of the transmission-light signal received at the connection point from the first core and the reception-light signal received at the connection point from the second core and sending the reception-light signal of the first travelling direction characteristic to the light transmitting means to make the reception-light signal detecting means detect the reception-light signal, while preventing the remaining portion of the transmission-light signal of the second travelling direction characteristic from being sent to the light transmitting means.