Raman-amplified optical transmission system and method for amplifying optical signals
A technology of Raman amplification and Raman amplifier, which is applied in the field of Raman amplification optical transmission system, can solve the problems of compromising cost-effective system implementation simplicity, etc., and achieve the effects of easy tuning, cost reduction and size reduction
Inactive Publication Date: 2007-02-14
ALCATEL LUCENT SAS
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Problems solved by technology
With regard to cost-effectiveness and compactness of implementation, this approach has major disadvantages as it uses multiple diodes
Furthermore, in such systems, gain control for constant gain involves complex joint control of the multiple diodes, which in turn compromises cost-effectiveness and simplicity of system implementation
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[0022] figure 1 An optical transmission system 1 according to the invention is shown arranged between a transmitter 2 for generating and transmitting an optical signal S and a receiver 3 for receiving and processing the optical signal S. FIG. The optical transmission system 1 comprises a distributed Raman amplifier (DRA) in a transmission or link optical fiber 4 arranged for receiving an optical signal S from a transmitter 2 . To amplify the signal S, the DRA is pumped by means of a pump 5 for pumping the transmission fiber 4, as figure 1 Indicated by the arrow P in. So far, the system 1 comprises a first multiplexer 6 operatively connected to the delivery fiber 1 and the pump 5 . The pump 5 comprises three laser pump diodes 5.1, 5.2 and 5.3 operating at different respective pump wavelengths λP1, λP2 and λP3, where λP1figure 1, the pumping of the DCF 9 (i.e. the DCM) by means of the DCF pump 10 is shown by the arrow P'. So far, the system 1 comprises a second multiplexer 11...
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A Raman-amplified optical transmission system (1) comprises at least one transmission fiber (4) for Raman amplifying of an optical signal (S), at least one corresponding pump (5, 5.1, 5.2, 5.3) for pumping the transmission fiber (4) at a plurality of pumping wavelengths (»P1, »P2, »P3), at least one Lumped Raman Amplifier LRA (9, 10, 11) for imparting an additional gain on the optical signal (S), and at least one corresponding LRA pump (10, 10.1) for pumping the lumped Raman amplifier LRA. According to the present invention the LRA pump (10, 10.1) is adapted to operate at a single LRA pumping wavelength (»P3), which is essentially equal to one of the pumping wavelengths (»P3) of the pump (5, 5.3) for pumping the transmission fiber (4). In this way the present invention provides an optical transmission system (1) and a corresponding method for amplifying optical signals (S), respectively, which distinguish themselves with respect to cost effectiveness, compactness of realisation, and possible gain control, particularly in relation with constant-gain operation, from prior art solutions.
Description
technical field [0001] The present invention relates to a Raman amplified optical transmission system comprising at least one transmission fiber for Raman amplification of optical signals; at least one corresponding pump for pumping said transmission fiber at a plurality of pumping wavelengths; at least a lumped Raman amplifier (LRA) for providing additional gain to the optical signal; and at least one corresponding LRA pump for pumping the lumped Raman amplifier LRA. [0002] Furthermore, the invention relates to a method for amplifying an optical signal in an optical transmission system comprising the step of Raman amplifying an optical signal in at least one transmission fiber by pumping at a plurality of pump wavelengths ; and imparting additional gain to the amplified optical signal in at least one lumped Raman amplifier. Background technique [0003] In long-distance optical communication systems, erbium doped fiber amplifiers (erbium doped fiber amplifiers: EDFAs) ar...
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IPC IPC(8): H04B10/12H04B10/17H04B10/2513H04B10/291
CPCH04B10/2916H04B2210/003H04B10/25133
Inventor 卡特琳·马丁内利多米尼克·安妮·蒙加尔迪安
Owner ALCATEL LUCENT SAS