US4786140A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of modulating large-power light beams using fiber raman amplification
Assignee: Verizon Laboratories Inc
•
Filing: 1987-10-30
•
Granted: 1988-11-22
•
Expires: 2007-10-30
Abstract
Abstract Fast modulation on a low-power laser beam is transferred to a high-power beam when the high-power beam pumps to depletion the amplification of the low-power beam in a fiber Raman amplifier.
Inventors
- 👤 Paul Melman
- 👤 Mark L. Dakss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:00
CPC Classifications
H; H01; H01S; H01S3/00; H01S3/30; H01S3/302; Y; Y10; Y10S; Y10S359/00; Y10S359/90
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
163 words
A method of modulating a continuous-wave large-power light beam with Raman amplification comprising the steps of providing a length of low-loss optical fiber having an input end and an output end; applying said large-power light beam at a pump wavelength λ 1 to said input end of said optical fiber, whereby said output end of said fiber normally provides a first continuous-wave output beam at said pump wavelength λ 1 and a second output beam at a wavelength λ 2 , where the intensity of said first output beam is much higher than the intensity of said second output beam; and then, applying said large-power light beam at said pump wavelength λ 1 to said input end of said optical fiber, and applying a weak modulated optical signal at said wavelength λ 2 to said input end of said optical fiber, whereby said optical fiber, at said output end, provides a significantly modulated large-power light beam at said pump wavelength λ 1 .
Claim 2
Independent Claim
163 words
A method of modulating a continuous-wave large-power light beam with Raman amplification comprising the steps of providing a length of low-loss optical fiber having an input end and an output end; applying said large-power light beam at a pump wavelength λ 1 to said input end of said optical fiber, whereby said output end of said fiber normally provides a first continuous-wave output beam at said pump wavelength λ 1 and a second output beam at a wavelength λ 2 , where the intensity of said first output beam is much higher than the intensity of said second output beam; and then, applying said large-power light beam at said pump wavelength λ 1 to said input end of said optical fiber, and applying a weak modulated optical signal at said wavelength λ 2 to said input end of said optical fiber, whereby said optical fiber, at said output end, provides a significantly modulated large-power light beam at said pump wavelength λ 1 .
Claim 3
Dependent Claim
28 words
The method as recited in claim 1 further including amplification of modulation of said large-power light beam comprising the step of varying said length of said optical fiber.
Claim 4
Dependent Claim
14 words
The method as recited in claim 1 wherein said low-loss optical fiber is glass.
Claim 5
Dependent Claim
21 words
The method as recited in claim 1 wherein said low-loss optical fiber is constructed of fused quartz with a germanium-doped core.
Claim 6
Dependent Claim
12 words
The method as recited in claim 1 wherein 1/λ.sub.1 -1/λ.sub.2 =450 cm.sup.-1.
Claim 7
Independent Claim
142 words
A method of modulating a large-power light beam with Raman amplification comprising the steps of providing a length of low-loss optical fiber having an input end and an output end; applying a light beam at a pump wavelength λ 1 to said input end of said optical fiber of such an intensity that said output end of said fiber provides a first output beam at said pump wavelength λ 1 and a second output beam at a wavelength λ 2 , where the intensity of said first output beam is much higher than the intensity of said second output beam; and applying a weak modulated optical signal at said wavelength λ 2 to said input end of said optical fiber, whereby said optical fiber, at said output end, provides a significantly modulated large-power light beam at said pump wavelength λ 1 .
Claim 8
Independent Claim
142 words
A method of modulating a large-power light beam with Raman amplification comprising the steps of providing a length of low-loss optical fiber having an input end and an output end; applying a light beam at a pump wavelength λ 1 to said input end of said optical fiber of such an intensity that said output end of said fiber provides a first output beam at said pump wavelength λ 1 and a second output beam at a wavelength λ 2 , where the intensity of said first output beam is much higher than the intensity of said second output beam; and applying a weak modulated optical signal at said wavelength λ 2 to said input end of said optical fiber, whereby said optical fiber, at said output end, provides a significantly modulated large-power light beam at said pump wavelength λ 1 .
References Cited (Backward Citations)
US4616898A
Cited
US4401364A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-11-22 | 1992-05-23 | 1992-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-11-22 | 1996-05-23 | 1996-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-11-22 | 2000-05-23 | 2000-11-22 | $7700.00 | Window Closed / Lapsed |