US5388171A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Semiconductor laser module
Assignee: Sumitomo Electric Industries Ltd
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Filing: 1993-04-09
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Granted: 1995-02-07
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Expires: 2013-04-09
Abstract
Abstract A semiconductor laser module is used for transmitting signals by optical fiber in optoelectronic communication. The module comprises a semiconductor laser, a lens, a receptacle and a lens holder. Reflection beams at an end of a fiber must not return to the semiconductor laser. To deviate the reflection beams from the semiconductor, a key-shaped glass block is mounted in the receptacle in tight contact with the end of a fiber. Repetition of putting on and taking off ferrules contaminates the glass block. Adhesion of dust deteriorates the performance against noise induced in the laser by the return of the beam. To avoid the adhesion of dust to the surface of the transparent block, a key-shaped transparent block is inserted into an axial hole of the receptacle, separating from the block. A gap between the block and fiber prohibits dust from cohering to the block. The deviation of axes of the receptacle and lens holder is small enough. The assembly is easy. The coupling between the receptacle and lens holder has strong mechanical strength.
Inventors
- 👤 Hisato Michikoshi
- 👤 Hiromi Nakanishi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 00:06
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/24; G02B6/42; G02B6/4201; G02B6/4204; G02B6/4207
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
101 words
A semiconductor laser module comprising: a semiconductor laser for emitting light beams; a lens for converging the light beams; a lens holder having an axial bore for keeping the lens in the axial bore and the semiconductor laser at an end of the axial bore; a ferrule holding an end of an optical fiber; a receptacle having an axial hole for supporting the ferrule, the receptacle being connected to the lens holder; and a transparent block with imparallel front and rear surfaces fixed in the axial hole of the receptacle, the transparent block being separated from the end of the fiber.
Claim 2
Dependent Claim
101 words
A semiconductor laser module comprising: a semiconductor laser for emitting light beams; a lens for converging the light beams; a lens holder having an axial bore for keeping the lens in the axial bore and the semiconductor laser at an end of the axial bore; a ferrule holding an end of an optical fiber; a receptacle having an axial hole for supporting the ferrule, the receptacle being connected to the lens holder; and a transparent block with imparallel front and rear surfaces fixed in the axial hole of the receptacle, the transparent block being separated from the end of the fiber.
Claim 3
Dependent Claim
61 words
A semiconductor laser module as claimed in claim 1, wherein a thickness D of the transparent block is approximately 0.3 mm to 6 mm, a gap d separating the transparent block from the end of the fiber is approximately 0.05 mm to 3 mm and an inclination angle held between the imparallel front and rear surfaces is approximately 2° to 20°.
Claim 4
Dependent Claim
20 words
A semiconductor laser module as claimed in claim 2, wherein the front surface of the transparent block has antireflection coating.
Claim 5
Dependent Claim
20 words
A semiconductor laser module as claimed in claim 2, wherein the rear surface of the transparent block has antireflection coating.
Claim 6
Dependent Claim
23 words
A semiconductor laser module as claimed in claim 2, wherein both the front and rear surfaces of the transparent block have antireflection coating.
Claim 7
Dependent Claim
33 words
A semiconductor laser module as claimed in claim 2, wherein the front surface of the transparent block does not coincide with a point at which the light beams are converged by the lens.
Claim 8
Dependent Claim
33 words
A semiconductor laser module as claimed in claim 2, wherein the rear surface of the transparent block does not coincide with a point at which the light beams are converged by the lens.
Claim 9
Dependent Claim
27 words
A semiconductor laser module as claimed in claim 2, wherein the front surface of the transparent block is not perpendicular to the axial line of the receptacle.
Claim 10
Dependent Claim
53 words
A semiconductor laser module as claimed in claim 1, wherein an inclination angle θ 1 of the front surface of the transparent block to an axial line of the receptacle is larger than an inclination angle θ 2 of the rear surface of the transparent block to an axial line of the receptacle.
Claim 11
Dependent Claim
20 words
A semiconductor laser module as claimed in claim 9, wherein the front surface of the transparent block has antireflection coating.
Claim 12
Dependent Claim
20 words
A semiconductor laser module as claimed in claim 9, wherein the rear surface of the transparent block has antireflection coating.
Claim 13
Dependent Claim
23 words
A semiconductor laser module as claimed in claim 9, wherein both the front and rear surfaces of the transparent block have antireflection coating.
Claim 14
Dependent Claim
33 words
A semiconductor laser module as claimed in claim 9, wherein the front surface of the transparent block does not coincide with a point at which the light beams are converged by the lens.
Claim 15
Dependent Claim
33 words
A semiconductor laser module as claimed in claim 9, wherein the rear surface of the transparent block does not coincide with a point at which the light beams are converged by the lens.
Claim 16
Dependent Claim
27 words
A semiconductor laser module as claimed in claim 9, wherein the front surface of the transparent block is not perpendicular to the axial line of the receptacle.
Claim 17
Dependent Claim
20 words
A semiconductor laser module as claimed in claim 1 wherein the front surface of the transparent block has antireflection coating.
Claim 18
Dependent Claim
20 words
A semiconductor laser module as claimed in claim 1, wherein the rear surface of the transparent block has antireflection coating.
Claim 19
Dependent Claim
23 words
A semiconductor laser module as claimed in claim 1, wherein both the front and rear surfaces of the transparent block have antireflection coating.
Claim 20
Dependent Claim
33 words
A semiconductor laser module as claimed in claim 1, wherein the front surface of the transparent block does not coincide with a point at which the light beams are converged by the lens.
Claim 21
Dependent Claim
33 words
A semiconductor laser module as claimed in claim 1, wherein the rear surface of the transparent block does not coincide with a point at which the light beams are converged by the lens.
Claim 22
Dependent Claim
27 words
A semiconductor laser module as claimed in claim 1, wherein the front surface of the transparent block is not perpendicular to the axial line of the receptacle.
Claim 23
Dependent Claim
116 words
A semiconductor laser module comprising: a semiconductor laser for emitting light beams; a lens for converging the light beams; a lens holder having an axial bore for keeping the lens in the axial bore and the semiconductor laser at an end of the axial bore; a ferrule holding an end of an optical fiber, the end of the fiber being substantially perpendicular to an optical axis of the fiber; a receptacle having an axial hole for supporting the ferrule, the receptacle being connected to the lens holder; and a transparent block with imparallel front and rear surfaces fixed in the axial hole of the receptacle, the transparent block being separated from the end of the fiber.
Claim 24
Dependent Claim
116 words
A semiconductor laser module comprising: a semiconductor laser for emitting light beams; a lens for converging the light beams; a lens holder having an axial bore for keeping the lens in the axial bore and the semiconductor laser at an end of the axial bore; a ferrule holding an end of an optical fiber, the end of the fiber being substantially perpendicular to an optical axis of the fiber; a receptacle having an axial hole for supporting the ferrule, the receptacle being connected to the lens holder; and a transparent block with imparallel front and rear surfaces fixed in the axial hole of the receptacle, the transparent block being separated from the end of the fiber.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-02-06 | 1998-08-08 | 1999-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-02-06 | 2002-08-08 | 2003-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-02-06 | 2006-08-08 | 2007-02-07 | $7700.00 | Window Closed / Lapsed |