Light transmission system and method for compensating wavelength dispersion of master signal by complexing non-chromatic dispersion control signal
A technology for controlling signal and wavelength dispersion, applied in the field of optical transmission system, can solve the problem that the transmission system cannot perform remote control and monitoring
Inactive Publication Date: 2008-09-24
NEC CORP
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Problems solved by technology
However, this transmission system cannot perform its remote control and monitoring functions when frame misalignment occurs in the received signal
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[0013] Referring now to FIG. 1, there is shown a long-distance optical transmission system according to an exemplary embodiment of the present invention. The optical transmission system comprises an optical transmitter 12, which receives an optical signal from a subscriber transmitter 11 on the upstream side of the transmission system, and transmits its output to an optical transmission link 13, and an optical receiver 14, which receives via the optical transmission link 13 output of the optical transmitter 12, and transmit the optical signal as a replica of the original optical signal of the user transmitter 11 to the user receiver 15 on the downstream side of the system.
[0014] The optical transmitter 12 includes an optical-to-electrical converter 101 that converts optical signals from the user transmitter 11 into electrical signals, and a clock and data recovery circuit 102 that recovers original data and clock signals and feeds them into a signal processing circuit 103 . ...
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This invention refers to an optical transmission system and method for compensating wavelength dispersion of main signal by multiplexing dispersion-free control signal. At the transmit end of an optical transmission link, a main signal and a control signal are multiplexed into an optical multiplex signal and forwarded to the link. The frequency of the control signal is much lower than the frequency of the main signal so that the control signal is not affected by the wavelength dispersion effect of the transmission link. At the receive end of the link, the optical multiplex signal is de-multiplexed, recovering the main signal and the control signal. An amount of compensation necessary to compensate for the wavelength dispersion of the recovered main signal is detected and used in combination with the dispersion-free control signal to compensate for the wavelength dispersion of the optical main signal. The main signal and the control signal may either be frequency division multiplexed or wavelength division multiplexed into the optical multiplex signal.
Description
[0001] This application is based on and claims the benefit of priority from Japanese Patent Application No. 2007-078032 filed on March 25, 2007, the entire disclosure of which is incorporated herein by reference. technical field [0002] The present invention relates to optical transmission systems and, more particularly, to optical transmission systems and methods for compensating for wavelength dispersion of an optical main signal that occurs during transmission over long-distance optical transmission links. Background technique [0003] A long-distance optical transmission link includes an optical transmitter disposed at the transmitting end of the optical transmission link, and an optical receiver at the receiving end of the link. The optical transmitter receives the optical signal from the user transmitter, converts it into an optical signal with a preset wavelength and a preset power level, and sends the optical signal to the optical receiver through a transmission link...
Claims
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IPC IPC(8): H04B10/18H04B10/06H04B10/04H04B10/07H04B10/077H04B10/079H04B10/2507H04B10/2525H04B10/54H04B10/58H04J14/00H04J14/02
CPCH04B10/2513H04J14/02
Inventor 山田圭一
Owner NEC CORP