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Optical mixer of coherent reception machine

A technology of coherent receivers and optical mixers, applied in electromagnetic receivers, instruments, optics, etc., can solve the problems of poor delay and temperature stability, and achieve mature processing technology, high polarization extinction ratio, and good temperature stability Effect

Active Publication Date: 2013-06-19
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

[0007] The invention provides a coherent receiver optical mixer, which solves the problems of delay difference and poor temperature stability between different output components of the existing optical mixer

Method used

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Embodiment Construction

[0029] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0030] Such as figure 1 As shown, in this embodiment, a wave splitter 1, a 50 / 50 beam splitter 2, a phase shifter 3, a wave combiner 4, a 1 / 2 wave plate 5, and a polarization splitter 6 are sequentially arranged along the direction of the optical path. Give the X, Y, Z axis directions of the Cartesian coordinate system;

[0031] The wave splitter 1 is composed of a superposition of a first displacement crystal and a second displacement crystal, the shape and size of the first displacement crystal and the second displacement crystal are the same, the main sections are parallel, and the orientations of the optical axes are opposite;

[0032] The 50 / 50 beam splitter 2 is composed of a cube beam splitter and a 45° reflector;

[0033] The phase shift plate 3 is composed of an upper 1 / 8 wave plate and a lower 1 / 8 wave plate stacked up and down, the fast a...

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Abstract

The invention discloses an optical mixer of a coherent reception machine, and belongs to optical devices of optical fiber communication. The optical mixer of the coherent reception machine solves the problems that delayed differences exist among different output components of an existing optical mixer, and temperature stability is poor. The optical mixer of the coherent reception machine is provided with a wave separator, a 50 / 50 beam splitter, a phase shift piece, a wave combiner, a 1 / 2 wave piece and a polarization separator along the direction of an optical path in sequence. The optical mixer of the coherent reception machine serves as a 2*8 optical mixer, and uses characteristics of a single-axis birefringent crystal to achieve polarization separation, beam combination and optical process compensation. Light beams achieve phase shift of an angle of 90 degrees through the phase shift piece, and phase diversity control is achieved. Eight quartz crystals with different thicknesses of the polarization separator are used for compensating the delayed differences among different optical paths. Different devices are mature in machining technology, and good in temperature stability. The optical mixer of the coherent reception machine is compact in overall structure, high in polarization extinction ratio, and capable of being used for coherent demodulation of optical signals by using an advanced modulation format and a polarization multiplexing mode in the optical fiber communication.

Description

technical field [0001] The invention belongs to an optical device for optical fiber communication, and in particular relates to a coherent receiver optical mixer, which is used for realizing coherent reception and demodulation of an optical signal transmitted in an optical fiber using a polarization multiplexing mode and an advanced modulation format. Background technique [0002] In recent years, with the continuous upgrading of optical fiber communication systems, optical signals transmitted in optical fibers have begun to use advanced modulation formats and present the characteristics of carrying information in the entire field (amplitude, frequency, phase, polarization). In view of this feature, the coherent detection method must be used at the receiving end of the system to obtain all the information carried by the optical signal. The quadrature phase-shift keying (DP-QPSK) format using polarization multiplexing is a typical optical signal multiplexing and modulation me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/61G02B27/28
Inventor 柯昌剑钱路万助军潘登
Owner HUAZHONG UNIV OF SCI & TECH
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