Source: http://www.google.com/patents/US8000567?dq=7350717
Timestamp: 2017-03-27 18:30:47
Document Index: 246956019

Matched Legal Cases: ['§120', '§119', 'Application No. 2002', 'art 108', 'art 108', 'art 108', 'art 108', 'art 108', 'art 108', 'art 108', 'art 108', 'art 108', 'art 308', 'art 308', 'art 308', 'art 308', 'art 308', 'art 308', 'art 308']

Patent US8000567 - Optical semiconductor module - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inPatentsAn optical semiconductor module including a base having installed on an optical fiber and an optical semiconductor element, and a package which houses the base on a bottom thereof and has a first side wall with an optical section through which the optical fiber is led and a second side wall facing the...http://www.google.com/patents/US8000567?utm_source=gb-gplus-sharePatent US8000567 - Optical semiconductor moduleAdvanced Patent SearchTry the new Google Patents, with machine-classified Google Scholar results, and Japanese and South Korean patents.Publication numberUS8000567 B2Publication typeGrantApplication numberUS 12/761,910Publication dateAug 16, 2011Filing dateApr 16, 2010Priority dateJun 14, 2002Fee statusPaidAlso published asUS7477810, US7738747, US20030235377, US20080031567, US20080267240, US20100195962Publication number12761910, 761910, US 8000567 B2, US 8000567B2, US-B2-8000567, US8000567 B2, US8000567B2InventorsJun Miyokawa, Takashi Koseki, Toru FukushimaOriginal AssigneeThe Furukawa Electric Co., Ltd.Export CitationBiBTeX, EndNote, RefManPatent Citations (44), Referenced by (1), Classifications (16), Legal Events (1) External Links: USPTO, USPTO Assignment, EspacenetOptical semiconductor module
US 8000567 B2Abstract
1. An optical semiconductor module including a base having installed thereon an optical fiber and an optical semiconductor element, and a package which houses the base on a bottom thereof and has a first side wall with an outlet section through which the optical fiber is led and a second side wall facing the first wall, wherein
the base is cut off to form a terrace at a lower corner on a side of the base facing the second side wall of the housing, wherein
a ratio of h/t is from 0.4 to 1.0 and a ratio of L/t is from 0.4 to 1.0, where t is a thickness of the base, h is a distance between the terrace and the bottom, and L is a width of the terrace.
2. The optical semiconductor module according to claim 1, wherein the outlet section is a snout-like outlet with a through hole, a cross-section of which at a base thereof is larger than that of the through hole at a free edge thereof.
3. The optical semiconductor module according to claim 2, wherein a diameter of the through hole at the base is larger than a diameter of the through hole at the free edge.
4. The optical semiconductor module according to claim 1, wherein the optical fiber includes an optical fiber connected to a lens.
5. The optical semiconductor module according to claim 1, wherein the optical semiconductor element includes at least one of a semiconductor laser element of a photodiode element.
This application is a division of U.S. Ser. No. 12/147,060, filed Jun. 26, 2008, which is a division and claims the benefit under 35 U.S.C. §120 from parent application, U.S. Ser. No. 11/837,084, (U.S. Pat. No. 7,477,810), filed Aug. 10, 2007, of which the entire contents of both are incorporated herein by reference. Application Ser. No. 11/837,084 is a continuation of U.S. Ser. No. 10/460,405 (U.S. Patent Publication No. 2003/0235377 A1) filed Jun. 13, 2003, and claims the benefit of priority under 35 U.S.C. §119 from Japanese Patent Application No. 2002-174969, filed Jun. 14, 2002.
FIG. 23A is a plan view of a part of a conventional semiconductor laser diode (hereinafter, “LD”) module, and FIG. 23B is a longitudinal cross-sectional view of the part. The LD module includes a base 6 onto which a heat sink 3 and a carrier 5 are soldered. On the heat sink 3, an LD element 1 and a thermistor 2 are mounted, and on the carrier 5, a photo diode (hereinafter, “PD”) element 4 is mounted. Further, a metal ferrule 7 a supporting an optical fiber 7 is fixed onto the base 6 via two support members 6 a by YAG laser welding or with solder. The welding points, in the drawings, are denoted by solid circles Pwd. The optical fiber 7 is precisely aligned so as to be optically coupled with a laser beam emitted from the LD element 1, and is fixed onto the support member 6 a. FIG. 24 is a longitudinal cross-sectional view of the conventional LD module, where the base 6 is accommodated within a package 8, and is fixed onto a bottom plate 8 e of the package 8. The package 8 is sealed with a lid 9 at the upper opening, thereby to complete the assembly of the LD module. A lensed fiber, one end of which being formed in a spherical or a wedged shape to serve as a lens portion, is used as the optical fiber 7 in order to ensure a high coupling efficiency between the optical fiber 7 and the laser beam emitted from the LD element 1. The other end of the optical fiber 7 is led out of the package 8 through a longitudinal hole 8 a of a snout 8 b prior to mounting of the base 6 onto the bottom plate 8 e of the package 8. A portion between the optical fiber 7 and the internal wall of the snout 8 b is hermetically sealed with sealant S like solder or synthetic resin.
Further, in the mounting step, the optical fiber 7 is often excessively bent at a portion A encircled by a dashed line in FIG. 25, by contact with the snout 8 b. In some cases, the optical fiber 7 is coated with metal (e.g., gold), in order to facilitate the hermetic sealing of the optical fiber 7 inside the inner space of the snout 8 b with solder S or other sealant, or in order to facilitate the soldering of the optical fiber 7 to the base 6. Such metal-coated optical fibers have a minimum allowable bending curvature radius larger than that of non-coated optical fibers and are more repulsive against the bending deformation. Therefore, the optical fiber 7 needs to be handled so as not to be bent too much.
The similar situation may be present not only in optical semiconductor modules in general of butterfly-type, including receiver modules (hereinafter, “PD modules”) having a PD element mounted on the base 6, but also in the LD module of so-called DIL (Dual In Line) type which utilizes a small-sized package.
FIG. 2 is a top plan view of a package of the LD module shown in
An optical semiconductor module according to a first embodiment of the present invention is an LD module. FIG. 1 is a longitudinal cross-sectional view of the LD module. This LD module 10 differs from the conventional LD module shown in FIG. 24, in that a base 11 is fixed onto the bottom plate 8 e instead of the base 6. On the base 11 are provided, the heat sink 3 mounting thereon the LD element 1 and the thermistor 2, the carrier 5 mounting thereon the PD element 4, and two pieces of support members 11 a supporting the metal ferrule 7 a holding the optical fiber 7. The metal ferrule 7 a is fixed to the base 11 through the two support members 11 a by YAG laser-welding or soldering. The optical fiber 7 is arranged to pass through the longitudinal hole 8 a of the snout 8 b. The portion between the optical fiber 7 and the internal wall of the snout 8 b is hermetically sealed with a sealant S like solder. The package 8 is sealed with the lid 9 at the upper opening. The package 8 also has a front wall 8 c and a rear wall 8 d that faces the front wall 8 c. FIG. 2 is a top plan view of the package 8. The package 8 is of a butterfly type having a plurality of leads Ld protruding from the package 8 at both sides. The snout 8 b is covered with a rubber covering Bg. A part of the optical fiber 7 that is led out of the package 8 is protected by a protective tube Tg. The package 8 has a length L not larger than 16 millimeter, a width W not larger than 10 millimeter, and a height H not larger than 8 millimeter, as shown in FIGS. 1 and 2.
FIG. 7 is a longitudinal cross-sectional view of an LD module according to the second embodiment of the present invention. The LD module 15 differs from the conventional LD module, in the shape of its package. The LD module 15 is configured as an optical semiconductor module having a butterfly-type package. As shown in FIG. 7, a snout 108 b of a package 108 consists of a first part 108 b 1 and a second part 108 b 2. The second part 108 b 2 has a larger diameter than that of the first part 108 b 1, and is positioned between the first part 108 b 1 and a front wall 108 c of the package 108. These first part 108 b 1 and the second part 108 b 2 have a longitudinal hole 108 a through them, for guiding the optical fiber 7 to the outside. The longitudinal hole 108 a consists of a first longitudinal hole 108 a 1 of the first part 108 b 1, and a second longitudinal hole 108 a 2 of the second part 108 b 2. The longitudinal hole 108 a is, concretely, formed such that an upper boundary FUI of the second longitudinal hole 108 a 2 is located higher than an upper boundary FUO of the first longitudinal hole 108 a 1. As a result, the optical fiber 7, when led to the outside of the package 108 through the longitudinal hole 108 a, is prevented from being brought into contact with the internal surface of the second longitudinal hole 108 a 2. Therefore, an excessive bending deformation of the optical fiber 7 is suppressed.
A package 208 may be used in place of the package 108 (see FIG. 9). The package 208 has a front wall 208 c, a rear wall 208 d, a bottom plate 208 e, and a snout 208 b. An external diameter of the snout 208 b is uniform along the longitudinal direction. The snout 208 b has a longitudinal hole 208 a whose diameter is linearly small toward the outside. In other words, the longitudinal hole 208 a has taper at its internal surface along the longitudinal direction. The taper may not necessarily be formed over the entire of the internal surface along its longitudinal direction but may be formed at least on a part thereof. For example, the taper is formed on only a part of the internal surface near the front wall 208 c. Further, a package 308 may be used in place of the package 108 (see FIG. 10). The package 308 has a front wall 308 c, a rear wall 308 d, a bottom plate 308 e, and a snout 308 b having a longitudinal hole 308 a. The snout 308 b has a first part 308 b 1 and a second part 308 b 2. A part of the longitudinal hole 308 a on the first part 308 b 1 has a uniform diameter along the longitudinal direction, and a part of longitudinal hole 308 a on the second part 308 b 2 has diameter that is linearly small toward the first part 308 b 1. External diameters of the snout 308 b are values corresponding to the diameters of the longitudinal hole 308 a of the first part 308 b 1 and of the second part 308 b 2.
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