Polarization-independent direct detection system and method based on light intensity modulated signal
A modulation signal and detection system technology, applied in the direction of polarization multiplexing system, transmission system, electromagnetic wave transmission system, etc., can solve the problems of increasing system cost and achieve the effect of simplifying complexity and improving transmission capacity
Active Publication Date: 2018-01-02
WUHAN POST & TELECOMM RES INST CO LTD
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[0003] The purpose of the present invention is to overcome the disadvantages of the above-mentioned background technology, provide a polarization-independent direct detection system and method based on optical intensity modulation signals, and increase the transmission capacity of the system to the original two without significantly increasing the system cost. times
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[0025] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0026] see figure 1 As shown, an embodiment of the present invention provides a polarization-independent direct detection system based on an optical intensity modulation signal. The system includes a sending end and a receiving end. The sending end includes a first laser, a first polarization beam splitter, and a first intensity modulator. , the second intensity modulator, the polarization coupler, the second laser, the third laser, the first polarization controller, the second polarization controller, the coupler, the output end of the first laser and the input end of the first polarization beam splitter connected, the first polarization beam splitter has two output ends, one output end is connected to the first intensity modulator, and the other output end is connected to the second intensity modulator, the output end of the first i...
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The invention discloses a polarization-independence direct detection system and method based on a light intensity modulation signal, and relates to the field of optical fiber communication. The method comprises the following steps that: a sending send divides light signals into two beams of perpendicular signals in a polarization state, the two signals in the polarization state are respectively modulated in an intensity modulation mode, and polarization multiplexing signals are formed after the two signals pass through a polarization coupler; two beams of lasers perpendicular in polarization direction are used as two pilot signals used for carrying out frequency beating with the polarization multiplexing signals on a receiving end so as to realize polarization-independence light signal receiving; and the receiving end divides the received signals into two beams of perpendicular signals in a polarization state, the two beams of signals respectively are subjected to re-sampling changing into doubled sampling, then a conventional constant modulus algorithm is utilized for processing, and recovered signals are directly judged. According to the invention, the transmission capacity of the system is doubled without increasing the cost of the system.
Description
technical field [0001] The invention relates to the field of optical fiber communication, in particular to a polarization-independent direct detection system and method based on light intensity modulation signals. Background technique [0002] The current low-cost optical fiber communication system usually adopts the method of intensity modulation and direct detection, and is mainly used in the fields of optical interconnection, access network and metropolitan area network. Most of the existing optical fiber communication systems are limited to single-polarization transmission. Therefore, the transmission capacity of the existing optical fiber communication systems is limited and cannot meet the application requirements of the market. Contents of the invention [0003] The purpose of the present invention is to overcome the shortcomings of the above-mentioned background technology, provide a polarization-independent direct detection system and method based on optical inten...
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IPC IPC(8): H04B10/2569H04B10/532H04B10/54H04B10/66H04J14/06
CPCH04B10/2569H04B10/532H04B10/54H04B10/66H04J14/06
Inventor 李响
Owner WUHAN POST & TELECOMM RES INST CO LTD