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US5058986A
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Non-linear inferferometer
Assignee: IPG Photonics Corp
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Filing: 1989-12-11
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Granted: 1991-10-22
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Expires: 2009-12-11
Abstract
Abstract An optical fibre, loop interferometer (31) is formed from germania doped silica which exhibits Raman scattering at a threshold intensity to provide a transmitted optical signal from port (49) of coupler (35) whose intensity is a sigmoid function of the intensity of an optical signal input at port (39). It finds application in optical switching and logic operations on optical pulses.
Inventors
- 👤 Bimal K. Nayar
- 👤 Keith J. Blow
- 👤 Nicholas J. Doran
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:56
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/21; G02F3/00; G02F1/35; G02F1/3515; G02F1/3517; G02F1/3519
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
64 words
A non-linear interferometer having an output and an input and including an optically non-linear transmission medium producing an intensity dependent, relative phase shift between portions of an input optical signal, said transmission medium having an intensity dependent optical scattering above a predetermined non-zero intensity threshold such that the output intensity is at most a single period function of the intensity of the input signal.
Claim 2
Dependent Claim
64 words
A non-linear interferometer having an output and an input and including an optically non-linear transmission medium producing an intensity dependent, relative phase shift between portions of an input optical signal, said transmission medium having an intensity dependent optical scattering above a predetermined non-zero intensity threshold such that the output intensity is at most a single period function of the intensity of the input signal.
Claim 3
Dependent Claim
14 words
An interferometer as in claim 1 in which the interferometer comprises a fiber loop.
Claim 4
Dependent Claim
18 words
An interferometer as in claim 1 or 2 in which the intensity dependant optical scattering includes Raman scattering.
Claim 5
Dependent Claim
18 words
An interferometer as in claim 3 in which the transmission medium includes a germania doped silica optical fibre.
Claim 6
Dependent Claim
19 words
An interferometer as in claim 1 or 2 in which the optically non-linear transmission medium comprises polarisation-maining optical fibre.
Claim 7
Dependent Claim
24 words
An interferometer as in claim 1 or 2 in which the output intensity is a sigmoid function of the intensity of the input signal.
Claim 8
Dependent Claim
61 words
A non-linear interferometer as in claim 1 or 2 wherein said non-linear transmission medium has ends coupled to receive a portion of the optical input at each end, the intensities of the two portions being limited to substantially the same intensity after propagating a sufficient distance along the transmission medium above a predetermined input signal intensity due to said intensity-dependent scattering.
References Cited (Backward Citations)
EP0265233A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-10-21 | 1995-04-22 | 1995-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-10-21 | 1999-04-22 | 1999-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-10-21 | 2003-04-22 | 2003-10-22 | $7700.00 | Window Closed / Lapsed |