US4886334A
Expired / Lapsed
US
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Optical amplifying repeater
Assignee: NEC Corp
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Filing: 1988-09-01
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Granted: 1989-12-12
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Expires: 2008-09-01
Abstract
Abstract In an optical amplifying repeater, an input signal light which is propagated through a first transmission optical fiber is divided by an optical divider into a plurality of signal lights. Each of the signal lights is amplified in a corresponding optical amplifier among a plurality of optical amplifiers. The signal lights thus amplified are combined in an optical coupler to supply a second transmission optical fiber with a combined signal light. At least one of the optical amplifiers are controlled in its amplification gain so that a level of the combined signal light is held to be a predetermined value.
Inventors
- 👤 Yasuhiro Aoki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:57
CPC Classifications
H; H04; H04B; H04B10/00; H04B10/29; H04B10/291; H04B10/293; H04B10/2931; H01; H01S; H01S5/00; H01S5/50; H01S5/5009; H01S5/5018; H04B10/2912; H04B10/2914; H01S5/06; H01S5/068; H01S5/0683
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
134 words
An optical amplifying repeater comprising, an optical dividing means for dividing an input signal light propagated through a first transmission optical fiber into signal lights of a predetermined number, optical amplifiers of said predetermined number, each of said optical amplifiers amplifying a corresponding one of said signal lights to provide an amplified signal light, an optical combining means for combining said amplified signal lights from said optical amplifiers to supply a second transmission optical fiber with a combined signal light, a monitor means for the monitor of a level of said combined signal light to produce a monitor signal, and a control means for controlling an amplification gain of at least one optical amplifier among said optical amplifiers in response to said monitor signal whereby said level is held to be a predetermined value.
Claim 2
Dependent Claim
134 words
An optical amplifying repeater comprising, an optical dividing means for dividing an input signal light propagated through a first transmission optical fiber into signal lights of a predetermined number, optical amplifiers of said predetermined number, each of said optical amplifiers amplifying a corresponding one of said signal lights to provide an amplified signal light, an optical combining means for combining said amplified signal lights from said optical amplifiers to supply a second transmission optical fiber with a combined signal light, a monitor means for the monitor of a level of said combined signal light to produce a monitor signal, and a control means for controlling an amplification gain of at least one optical amplifier among said optical amplifiers in response to said monitor signal whereby said level is held to be a predetermined value.
Claim 3
Dependent Claim
77 words
An optical amplifying repeater according to claim 1, wherein each of said optical amplifiers includes a polarization splitter for dividing a corresponding one of said signal lights of said predetermined number into polarization components of TE and TM waves, a plurality of optical semiconductor laser amplifying elements each amplifying a corresponding signal light of said polarization components independently, and a polarization coupler for combining amplified signal lights supplied from said plurality of optical semiconductor laser amplifying elements.
References Cited (Backward Citations)
US4752120A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-12-11 | 1993-06-12 | 1993-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-12-11 | 1997-06-12 | 1997-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-12-11 | 2001-06-12 | 2001-12-12 | $7700.00 | Window Closed / Lapsed |