Coherent light generators – Particular temperature control – Heat sink
Patent
1989-11-15
1991-07-16
Gonzalez, Frank
Coherent light generators
Particular temperature control
Heat sink
372101, 357 74, 357 81, H01S 343
Patent
active
050330527
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention generally relates to optical semiconductor devices and production methods thereof, and more particularly to a semiconductor device which is used in the field of optical communication or optical transmission and a production method thereof.
DESCRIPTION OF THE RELATED ART
For example, in an optical communication system which uses an optical fiber as an optical transmission path, an optical semiconductor element and a light receiving end surface of an optical fiber are fixed with a predetermined positional relationship and a condenser lens is provided between the optical semiconductor element and the light receiving end surface so that a light emitted from the semiconductor element is directed within the optical fiber. The semiconductor element is a semiconductor laser, a light emitting diode or the like. The lens is provided to make a beam conversion so as to obtain a high coupling efficiency between the optical semiconductor element and the optical fiber, because the beam parameters of the optical semiconductor element and the optical fiber greatly differ and the optical coupling loss would otherwise become large if the two were simply arranged close to each other. Normally, the optical semiconductor element, the lens and the optical fiber are used in the form of an optical semiconductor module which is assembled integrally. In such an optical semiconductor module, the positional relationships of the constituent parts directly affect the optical coupling efficiency, and it is required that each constituent part is positioned with an extremely high accuracy of 1 .mu.m or less. In addition, it is also required that this high positioning accuracy is maintained for a long period of time.
FIG. 1 schematically shows an example of a conventional optical semiconductor module. Light emitted from an optical semiconductor element 1 is formed into generally parallel light beams by a lens 2, transmitted in a forward direction through an optical isolator 3, and is directed to an optical fiber 6 by being converged by Green rod lenses 4 and 5. When producing this kind of optical semiconductor module, the optical semiconductor element 1 and the lens 2 are fixed with a predetermined positional relationship to constitute an optical semiconductor assembly 7 which is indicated by a phantom line while the Green rod lens 5 and the optical fiber 6 are fixed with a predetermined positional relationship to constitute a fiber assembly 8 which is indicated by a phantom line. The assemblies 7 and 8, the optical isolator 3 and the Green rod lens 4 are assembled integrally. The constituent parts of the optical semiconductor module are made in the form of assemblies because it is simple to adjust the optical axis by adjusting the positional relationships of the assemblies.
FIG. 2 schematically shows another example of a conventional optical semiconductor module. In FIG. 2, those parts which are essentially the same as those corresponding parts in FIG. 1 are designated by the same reference numerals, and a description thereof will be omitted. In FIG. 2, the light which is emitted from the optical semiconductor element 1 with a predetermined angular aperture is formed into the generally parallel light beams by the lens 2 and converged by a lens 9 to enter the end surface of the optical fiber 6. The lens 9 and the optical fiber 6 are fixed with a predetermined positional relationship and constitute a fiber assembly 8a which is indicated by a phantom line. OA denotes the optical axis.
FIG. 3 is a perspective view of the conventional optical semiconductor assembly 7. In FIG. 3, the optical semiconductor element (semiconductor laser chip) 1 is mounted on a chip carrier 12 which is made of copper, for example. The chip carrier 12 is soldered on a block 14 which is made of stainless steel (SUS), and the block 14 is fixed on a SUS base 16 by a laser welding after the position of the block 14 is adjusted in a Z-axis direction which corresponds to the direction of the height of the block 14. A lens ho
REFERENCES:
patent: 4793688 (1988-12-01), Aiki et al.
patent: 4834492 (1989-05-01), Ishii et al.
Masuko Takayuki
Moriya Kaoru
Okushima Hiroki
Fujitsu Limited
Gonzalez Frank
Hansen Galen J.
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