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US5912754A
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Method for transmitting WDM optical signal to be amplified by optical amplification repeaters and systems used in same
Assignee: NEC Corp
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Filing: 1996-10-17
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Granted: 1999-06-15
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Expires: 2016-10-17
Abstract
Abstract It is the object of the invention to eliminate a limitation on the transmission distance of a WDM optical transmission system caused by wavelength dependencies of gains of optical amplification repeaters. The transmission characteristic of optical signal of the transmission system against the signal wavelength can be flatted by using plural kinds of the optical amplification repeaters with different gain peak wavelengths, and the longer transmission distance can be obtained.
Inventors
- 👤 Tadashi Koga
- 👤 Yasuhiro Aoki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 03:43
CPC Classifications
H; H04; H04B; H04B10/00; H04B10/29; H04B10/291; H04B10/293; H04B10/2933; H04B10/2935; H04B10/2912
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
132 words
A method for transmitting a wavelength division multiplexed optical signal to be amplified by optical amplification repeaters, comprising the steps of: multiplexing optical signals of predetermined wavelengths to provide said wavelength division multiplexed optical signal; transmitting said wavelength division multiplexed optical signal through an optical fiber transmission line; and amplifying said wavelength division multiplexed optical signal at predetermined repeating points of said optical fiber transmission line by said optical amplification repeaters, wherein said optical amplification repeaters, are divided into a plurality of kinds of optical amplification repeaters, wherein each kind of optical amplification repeater has a gain peak wavelength which is different from each other kind of optical amplification repeater, and wherein each kind of optical amplification repeater includes a plurality of optical amplification repeaters having the same identical gain peak wavelength.
Claim 2
Independent Claim
132 words
A method for transmitting a wavelength division multiplexed optical signal to be amplified by optical amplification repeaters, comprising the steps of: multiplexing optical signals of predetermined wavelengths to provide said wavelength division multiplexed optical signal; transmitting said wavelength division multiplexed optical signal through an optical fiber transmission line; and amplifying said wavelength division multiplexed optical signal at predetermined repeating points of said optical fiber transmission line by said optical amplification repeaters, wherein said optical amplification repeaters, are divided into a plurality of kinds of optical amplification repeaters, wherein each kind of optical amplification repeater has a gain peak wavelength which is different from each other kind of optical amplification repeater, and wherein each kind of optical amplification repeater includes a plurality of optical amplification repeaters having the same identical gain peak wavelength.
Claim 3
Dependent Claim
28 words
The method as defined in claim 1, wherein: said plurality of kinds are equal to or less than a number of said optical signals of said predetermined wavelengths.
Claim 4
Dependent Claim
22 words
The method as defined in claim 1, wherein: said gain peak wavelengths are different from said predetermined wavelengths of said optical signals.
Claim 5
Dependent Claim
22 words
The method as defined in claim 1, wherein: said gain peak wavelengths are equal to said predetermined wavelengths of said optical signals.
Claim 6
Independent Claim
196 words
A system for transmitting a wavelength division multiplexed optical signal to be amplified by optical amplification repeaters, comprising: a plurality of optical transmitters for transmitting a plurality of optical signals of predetermined wavelengths different from each other; an optical coupler for multiplexing said plurality of optical signals to provide a wavelength division multiplexed optical signal; an optical fiber for propagating said wavelength division multiplexed optical signal; means for amplifying said wavelength division multiplexed optical signal at predetermined points of said optical fiber by said optical amplification repeaters; an optical splitter for splitting said wavelength division multiplexed optical signal propagated through said optical fiber to provide said plurality of optical signals of said predetermined wavelengths; a plurality of optical receivers for receiving said plurality of optical signals of said predetermined wavelengths splitted by said optical splitter; wherein said optical amplification repeaters are divided into a plurality of kinds of optical amplification repeaters, wherein each kind of optical amplification repeater has a gain peak wavelength which is different from each other kind of optical amplification repeater, and wherein each kind of optical amplification repeater includes a plurality of optical amplification repeaters having the same identical gain peak wavelength.
Claim 7
Independent Claim
196 words
A system for transmitting a wavelength division multiplexed optical signal to be amplified by optical amplification repeaters, comprising: a plurality of optical transmitters for transmitting a plurality of optical signals of predetermined wavelengths different from each other; an optical coupler for multiplexing said plurality of optical signals to provide a wavelength division multiplexed optical signal; an optical fiber for propagating said wavelength division multiplexed optical signal; means for amplifying said wavelength division multiplexed optical signal at predetermined points of said optical fiber by said optical amplification repeaters; an optical splitter for splitting said wavelength division multiplexed optical signal propagated through said optical fiber to provide said plurality of optical signals of said predetermined wavelengths; a plurality of optical receivers for receiving said plurality of optical signals of said predetermined wavelengths splitted by said optical splitter; wherein said optical amplification repeaters are divided into a plurality of kinds of optical amplification repeaters, wherein each kind of optical amplification repeater has a gain peak wavelength which is different from each other kind of optical amplification repeater, and wherein each kind of optical amplification repeater includes a plurality of optical amplification repeaters having the same identical gain peak wavelength.
Claim 8
Dependent Claim
28 words
The system as defined in claim 5, wherein: said plurality of kinds are equal to or less than a number of said optical signals of said predetermined wavelengths.
Claim 9
Dependent Claim
22 words
The system as defined in claim 5, wherein: said gain peak wavelengths are different from said predetermined wavelengths of said optical signals.
Claim 10
Dependent Claim
22 words
The system as defined in claim 5, wherein: said gain peak wavelengths are equal to said predetermined wavelengths of said optical signals.
Claim 11
Dependent Claim
99 words
In a method for transmitting a wavelength division multiplexed optical signal, in which plural optical signals having different wavelengths from each other are transmitted through an optical fiber and are amplified by multi-stage optical amplification repeaters, a plurality of said optical amplification repeaters are divided into a plurality of kinds of optical amplification repeaters, wherein each kind of optical amplification repeater has a gain peak wavelength which is different from each other kind of optical amplification repeater, and wherein each kind of optical amplification repeater includes a plurality of optical amplification repeaters having the same identical gain peak wavelength.
Claim 12
Dependent Claim
99 words
In a method for transmitting a wavelength division multiplexed optical signal, in which plural optical signals having different wavelengths from each other are transmitted through an optical fiber and are amplified by multi-stage optical amplification repeaters, a plurality of said optical amplification repeaters are divided into a plurality of kinds of optical amplification repeaters, wherein each kind of optical amplification repeater has a gain peak wavelength which is different from each other kind of optical amplification repeater, and wherein each kind of optical amplification repeater includes a plurality of optical amplification repeaters having the same identical gain peak wavelength.
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