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US4784466A
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Optical transmission system comprising a radiation source and a multipleclad monomode optical transmission fibre with a negative-step index profile
Assignee: US Philips Corp
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Filing: 1986-09-17
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Granted: 1988-11-15
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Expires: 2006-09-17
Abstract
Abstract An optical transmission system is described which comprises a radiation source (30) and a multiple-clad monomode optical transmission fibre (10) with a negative-step index profile. In order to improve the efficiency of coupling the radiation from the source into the transmission fibre a single-clad-monomode transmission fibre (20), whose end portion which faces the source is tapered, is arranged between the source and said fibre.
Inventors
- 👤 Giok D. Khoe
- 👤 Peter K. Bachmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:26
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/24; G02B6/42; G02B6/4201; G02B6/4202; G02B6/4203
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
48 words
An optical transmission system comprising a radiation source; a multiple-clad monomode optical transmission fibre with a negative-step index profile; and a single-clad monomode optical transmission fibre, having a tapered core characterized by a first refractive index, arranged between the multiple-clad monomode optical transmission fibre and the radiation source.
Claim 2
Dependent Claim
48 words
An optical transmission system comprising a radiation source; a multiple-clad monomode optical transmission fibre with a negative-step index profile; and a single-clad monomode optical transmission fibre, having a tapered core characterized by a first refractive index, arranged between the multiple-clad monomode optical transmission fibre and the radiation source.
Claim 3
Dependent Claim
31 words
An optical transmission system as claimed in claim 1, wherein the single clad fibre and the multiple clad fibre are characterized by a substantially equal spot size at an interface therebetween.
Claim 4
Dependent Claim
28 words
An optical transmission system as claimed in claim 1 or 2, further comprising a lens system interposed between the radiation source and the single-clad monomode optical transmission fibre.
Claim 5
Dependent Claim
37 words
An optical transmission system as claimed in claim 3, wherein the lens system comprises a transparent material which is applied to one end of the single-clad monomode optical transmission fibre and which has a spherical outer surface.
Claim 6
Dependent Claim
35 words
An optical transmission system as claimed in claim 4, wherein the lens material is characterized by a higher refractive index than the refractive index of the core material of the single-clad monomode optical transmission fibre.
Claim 7
Dependent Claim
49 words
An optical transmission system as claimed in claim 4, wherein the lens material has a refractive index which is substantially equal to the refractive index of the core material and in that the lens material has a melting temperature which is lower than that of the transmission fibre material.
References Cited (Backward Citations)
US4143940A
Cited
US4243399A
Cited
US4370021A
Cited
US4252403A
Cited
US4440470A
Cited
GB2116744A
Cited
US4601535A
Cited
US4701011A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-11-15 | 1992-05-16 | 1992-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-11-15 | 1996-05-16 | 1996-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-11-15 | 2000-05-16 | 2000-11-15 | $7700.00 | Window Closed / Lapsed |