Patent US5455710A successfully refreshed from Google Patents.
US5455710A
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Optical amplifier for amplifying a signal light and a continuous light having a wave length different from the signal light
Assignee: Ando Electric Co Ltd
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Filing: 1995-01-26
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Granted: 1995-10-03
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Expires: 2015-01-26
Abstract
Abstract In an optical amplifier a signal light of a wave length λ a is coupled with a continuous light of a wave length λ b and amplified by an optical fiber amplifier. Then, the amplified output light is subjected to filtration to select the light of the wave length λ a alone, so that the ASE power is reduced and the dynamic range of the optical fiber amplifier from the minimum light receipt power to the saturation after amplification can be enlarged, and, in the case that the signal light is pulse-modulated, the deterioration of the extinction ratio is minimized.
Inventors
- 👤 Toshiyuki Takeda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:31
CPC Classifications
H; H01; H01S; H01S3/00; H01S3/05; H01S3/06; H01S3/063; H01S3/067; H01S3/06754; H01S2301/00; H01S2301/02; H01S3/09; H01S3/091; H01S3/094; H01S3/094003
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
144 words
An optical amplifier for amplifying a signal light which comprises: a first optical source for generating a signal light having a wavelength π a; a second optical source for generating a continuous light having a wavelength π b which is different from π a; an optical coupler for optically coupling the signal light and the continuous light to output a mixed signal light; an optical fiber amplifier for amplifying the mixed signal light, said amplifier introducing an amplified spontaneous emission (ASE); and an optical filter for allowing passage of the signal light having the wavelength π a and preventing passage of other wavelengths including the continuous light having the wavelength π b, whereby noise from the ASE is generally suppressed and a dynamic range of the signal light from the noise derived from the ASE is controlled by the use of the continuous light.
Claim 2
Dependent Claim
144 words
An optical amplifier for amplifying a signal light which comprises: a first optical source for generating a signal light having a wavelength π a; a second optical source for generating a continuous light having a wavelength π b which is different from π a; an optical coupler for optically coupling the signal light and the continuous light to output a mixed signal light; an optical fiber amplifier for amplifying the mixed signal light, said amplifier introducing an amplified spontaneous emission (ASE); and an optical filter for allowing passage of the signal light having the wavelength π a and preventing passage of other wavelengths including the continuous light having the wavelength π b, whereby noise from the ASE is generally suppressed and a dynamic range of the signal light from the noise derived from the ASE is controlled by the use of the continuous light.
Claim 3
Dependent Claim
25 words
An optical amplifier for amplifying a signal light according to claim 1, wherein the continuous light having the wavelength π b is an intensity-modulated light.
Claim 4
Dependent Claim
25 words
An optical amplifier for amplifying a signal light according to claim 1, wherein the signal light having the wavelength π a is a pulse-modulated light.
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) | 1998-10-02 | 1999-04-03 | 1999-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-10-02 | 2003-04-03 | 2003-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-10-02 | 2007-04-03 | 2007-10-03 | $7700.00 | Window Closed / Lapsed |