Homodyne detection type coherent light transmission system

A technology of coherent optical transmission and homodyne detection, applied in optical fiber transmission, electromagnetic transmitter, electromagnetic receiver, etc., can solve the problems of high cost and high power consumption of coherent optical passive optical access network

Active Publication Date: 2014-12-17
INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI
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Problems solved by technology

[0004] The present invention solves the technical problems of high cost an

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  • Homodyne detection type coherent light transmission system

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[0023] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0024] see figure 1 As shown, a low-cost homodyne detection coherent optical transmission system for coherent passive optical access network, including:

[0025] A semiconductor laser light source a, which is used to output laser light;

[0026] A first polarization control device b, one end of which is connected to the output end of the semiconductor laser light source a, used to control the polarization state and polarization direction of the laser light output by the semiconductor laser light source a, so that the polarization direction of the laser light and the high-order format can be realized The X-axis in the c end face of the modulated photoelectric modulator is 45°, the projection of the laser in the X-axis dir...

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Abstract

The invention discloses a homodyne detection type coherent light transmission system. The homodyne detection type coherent light transmission system comprises a semiconductor laser light source, a first polarized light control device which enables an angle of 45 degrees to be formed between a polarization direction of a laser and an X-axis in an end face of a photoelectric modulator, the photoelectric modulator which modulates same-phase and orthogonal electric signal components to the laser, a second polarization control device which enables an angle of 45 degrees to be formed between the polarization direction of the X-axis light component of a first light beam and a main axis of a first polarizer i and enables an angle of 45 degrees to be formed between a polarization direction of an X-axis light component of a second light beam and a main axis direction of a second polarizer j, a light beam splitter which splits the laser into the first light beam and the second light beam, a quarter-wave plate which enlarges a phase difference between the X-axis component and a Y-axis light component in the first light beam by pi/2, the first/second polarizer which filters away a projection component of the first/second light beam on the main axis of the first/second polarizer i, and a first photoelectric detector, a second photoelectric detector and a baseband signal processing module all of which are used for signal demodulation.

Description

technical field [0001] The invention belongs to the technical field of optical fiber communication, and more specifically relates to a low-cost homodyne detection coherent optical transmission system for passive optical access networks. Background technique [0002] The application of dense wavelength division multiplexing and high-order modulation formats in coherent optical communication systems is a key technology for the realization of next-generation optical passive access networks with high spectrum utilization and more flexible and controllable access methods. However, compared with the point-to-point coherent optical communication system applied in the backbone network, the point-to-multipoint network topology supporting multi-user access makes people have to consider the cost and function of the network receiving unit. Consumption problem. There are two main reasons for the high cost and high power consumption of the receiver part of the traditional coherent optica...

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Application Information

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IPC IPC(8): H04B10/25H04B10/63H04B10/50
Inventor 郑建宇刘建国祝宁华孙文惠
Owner INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI
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