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US 2007/0165299 A1Published application
Multi-wavelength light amplifier
AssigneeFujitsu Limited
InventorsYasushi SUGAYA, Miki TAKEDA, Susumu KINOSHITA, Terumi CHIKAMA
Life of this patent
Estimating the term…
Abstract
A multi-wavelength light amplifier includes a first-stage light amplifier which has a first light amplifying optical fiber amplifying a light input, a second stage light amplifier which has a second light amplifying optical fiber amplifying a first light output from the first-stage light amplifier, and an optical system which maintains a second light output of the second-stage light amplifier at a constant power level. The first-stage and second-stage light amplifiers have different gain vs wavelength characteristics so that the multi-wavelength light amplifier has no wavelength-dependence of a gain thereof,
Claims24
An optical transmission system comprising:
- an optical transmitter transmitting a WDM optical signal including a plurality of optical signals with different wavelengths;
- a multi-stage optical amplifier receiving the WDM optical signal transmitted by the optical transmitter, amplifying the received WDM optical signal and outputting the amplified WDM optical signal;
- and
- an optical receiver receiving the amplified WDM optical signal output from the multi-stage optical amplifier, the multi-stage optical amplifier including
- a first stage optical amplifier amplifying the WDM optical signal received by the multi-stage optical amplifier,
- a level controller controlling a power level of the WDM optical signal amplified by the first stage optical amplifier,
- a second stage optical amplifier amplifying the WDM optical signal of which level is controlled by the level controller, and
- an optical coupler splitting the WDM optical signal amplified by the second stage optical amplifier into a monitor optical signal and the amplified WDM optical signal to be output from the multi-stage optical amplifier.
5 more elements
An optical transmission system comprising:
- a first optical transmission line through which a WDM optical signal including a plurality of optical signals with different wavelengths is transmitted;
- a multi-stage optical amplifier receiving the WDM optical signal from the first optical transmission line, amplifying the received WDM optical signal and outputting the amplified WDM optical signal;
- and
- a second optical transmission line through which the amplified WDM optical signal output from the multi-stage optical amplifier is transmitted, wherein the multi-stage optical amplifier includes
- a front stage optical amplifier amplifying the received WDM optical signal to produce a front stage amplified WDM optical signal,
- a level controller controlling a power level of the front stage amplified WDM optical signal and outputting a controlled WDM optical signal,
- a rear stage optical amplifier amplifying the controlled WDM optical signal and outputting a rear stage amplified WDM optical signal, and
- an optical coupler splitting the rear-stage amplified WDM optical signal into a monitor optical signal and the amplified WDM optical signal to be output from the multi-stage optical amplifier.
5 more elements
An optical transmission system comprising:
- an optical transmitter transmitting a WDM optical signal including a plurality of optical signals with different wavelengths;
- a multi-stage optical amplifier amplifying the WDM optical signal transmitted from the optical transmitter and outputting the amplified WDM optical signal;
- and
- an optical receiver receiving the amplified WDM optical signal output from the multi-stage optical amplifier, wherein the multi-stage optical amplifier includes
- a first stage optical amplifier amplifying the WDM optical signal transmitted from the optical transmitter,
- a level controller controlling a power level of the WDM optical signal amplified by the first-stage optical amplifier,
- a second stage optical amplifier amplifying the WDM optical signal of which level is controlled by the level controller and outputting the amplified WDM optical signal, and
- an optical coupler splitting a monitor WDM optical signal off from amplified WDM optical signal output by the second stage optical amplifier.
5 more elements
An optical transmission system comprising:
- an optical transmitter transmitting a WDM optical signal including a plurality of optical signals with different wavelengths through a first optical transmission line;
- a multi-stage optical amplifier receiving the WDM optical signal from the first optical transmission line and amplifying the received WDM optical signal, the multi-stage optical amplifier including
- a first stage optical amplifier amplifying the received WDM optical signal,
- a level controller controlling a power level of the WDM optical signal amplified by the first-stage optical amplifier,
- a second stage optical amplifier amplifying the WDM optical signal of which level is controlled by the level controller and outputting an amplified WDM optical signal, and
- an optical coupler splitting a monitor WDM optical signal off from the amplified WDM optical signal output by the second stage optical amplifier,
- an optical receiver receiving the WDM optical signal amplified by the multi-stage optical amplifier through a second optical transmission line.
4 more elements
An apparatus comprising:
- a multi-stage optical amplifier amplifying a WDM optical signal including a plurality of optical signals with different wavelengths received from an optical transmitter and outputting an amplified WDM optical signal, the multi-stage optical amplifier including
- a first stage optical amplifier amplifying the WDM optical signal received from the optical transmitter,
- a level controller controlling a power level of the WDM optical signal amplified by the first stage optical amplifier,
- a second stage optical amplifier amplifying the WDM optical signal of which level is controlled by the level controller and outputting the amplified WDM optical signal, and
- an optical coupler splitting a monitor WDM optical signal off from the amplified WDM optical signal output by the second stage optical amplifier.
2 more elements
An apparatus comprising:
- a multi-stage optical amplifier amplifying a WDM optical signal including a plurality of optical signals with different wavelengths, the multi-stage optical amplifier including
- a front stage optical amplifier amplifying the WDM optical signal to produce a front stage amplified WDM optical signal,
- a level controller controlling a power level of the front stage amplified WDM optical signal and outputting a controlled WDM optical signal,
- a rear stage optical amplifier amplifying the controlled WDM optical signal to produce a rear stage amplified WDM optical signal, and
- an optical coupler splitting a monitor WDM optical signal off from the rear stage amplified WDM optical signal.
2 more elements
Dependencies are inferred from the claim text.