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Digital Optical Coherent Detection and Its Application

Author: FengYong
Tutor: ZhangHanYi
School: Tsinghua University
Course: Electronic Science and Technology
Keywords: Digital coherent optical detection Dispersion compensation Polarization multiplexing QPSK Optical sampling
CLC: TN929.1
Type: Master's thesis
Year: 2010
Downloads: 188
Quote: 1
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Abstract


The digital coherent optical detection is an important development direction of the high - speed optical communication , it is using a combination of coherent reception and digital signal processing , having a high receiving sensitivity , high spectral efficiency , it is possible to fully compensate for light injury in the transmission of various linear and nonlinear damage and other advantages. Many domestic and foreign universities, research institutions as an important research direction . In addition , the industry has also invested great enthusiasm like Nortel and U2T , optical communication equipment and devices to speed up the development and introduction of 40Gb / s digital coherent receiver , digital coherent detection technology has become seize the commanding heights of the next-generation transport technologies . The paper around the digital coherent optical detection key technology and its application to expand , to obtain the following results of the work . The use of low-cost fiber optic devices produced a digital coherent receiver, one of the key components : polarization diversity optical 90-degree mixer and four output loss difference is less than 0.3 dB , the delay difference of less than 5ps , compared to commercial items , has the advantages of low cost, flexible and adjustable , stable performance . On this basis , developed IQ quadrature mixer in the digital coherent detection , digital dispersion compensation , digital polarization de- multiplexing and carrier phase recovery and other basic digital signal processing algorithm module structures based on digital coherent receiver hardware platform , conducted a number of experimental studies . 20Gb / s polarization multiplexing DPSK signal after 280km of single-mode fiber transmission experiment . Developed MSP430 MCU control the fiber loop control system using magneto-optical switch , 40Gb / s polarization-multiplexed QPSK signal loop transmission of 1200 km , the receiver bit error rate is less than 10 -3 . Using digital coherent detection monitoring signal generator modulation distortion , can monitor the parent structure in the dual parallel modulator MZM bias point deviation monitoring error lt ; the 5 o < / sup > . Pulse mode-locked laser output light as a local oscillator , coherent light pulse sampling preliminary experimental study to achieve a high speed optical NRZ the DPSK signal intensity eye diagram reconstruction . The local oscillator optical pulse width to 1 ps , in theory, can measure up to 200G symbol / s or more high - speed optical signal eye diagram .

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Wireless communications > Lightwave communications, laser communications
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