Optical mixer for reflective coherent receivers
A technology of coherent receiver and optical mixer, applied in the field of optical devices, can solve the problems of poor temperature stability, uncompact structure of optical mixer, etc.
Active Publication Date: 2013-06-26
HUAZHONG UNIV OF SCI & TECH
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[0007] The invention provides a reflective coherent receiver optical mixer, which solves the problems of uncompact structure and poor temperature stability of existing optical mixers
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[0040] Below in conjunction with accompanying drawing and embodiment the present invention is described in detail, in order to clearly determine the position of each device in the present invention, in figure 1 The space Cartesian coordinate system XYZ is given in .
[0041] Such as figure 1 As shown, in the embodiment of the present invention, a polarization splitter 1, a 1 / 2 wave plate 2, a phase shifter 3, a first shift crystal 4, a 1 / 4 wave plate 5 and a combination mirror 6 are sequentially arranged along the incident optical path, 1 / 4 wave plate 5, first displacement crystal 4, 1 / 2 wave plate 2, and second displacement crystal 7 are sequentially arranged on the reflection optical path of combined reflector 6, wherein 1 / 2 wave plate 2, first displacement crystal 4 , 1 / 4 wave plate 5 is a shared device;
[0042] The polarization separator 1 is composed of a polarization separation prism and a 45-degree reflective mirror; the polarization separation prism is composed of t...
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The invention relates to an optical mixer for reflective coherent receives, belongs to optical devices of optical fiber communication and solves the problem that existing optical mixers are non-compact in structure and poor in temperature stability. A polarization separator, a 1 / 2 wave plate, a phase shift plate, a first shift crystal, a 1 / 4 wave plate and a combined reflecting mirror are sequentially arranged along an incident light path, and the 1 / 4 wave plate, the first shift crystal, the 1 / 2 wave plate and a second shift crystal are sequentially arranged on a reflecting light path of the combined reflecting mirror, wherein the 1 / 2 wave plate, the first shift crystal and the 1 / 4 wave plate are shared devices. Polarization separating is realized through a polarization separation prism, 90-degree phase shift is realized through the phase shift plate, safe-phase and orthogonal output light required is obtained by adopting the reflecting structure, birefringent crystals, the 1 / 4 wave plate, the 1 / 2 wave plate and the combined reflecting mirror, and polarization and phase diversity control is realized. The optical mixer is compact in integral structure, mature in processing technique of various devices, good in temperature stability and high in polarization extinction ratio, and can be used for optical signal coherent modulation by advanced modulation formats and polarization multiplexing way 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 reflective coherent receiver optical mixer, which is used to realize coherent reception and demodulation of optical signals transmitted in optical fibers using polarization multiplexing and advanced modulation formats. 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 hexadecimal quadrature amplitude modulation (DP-16QAM) format using polarization multiplexing is a typical optical signal multiplexing and mod...
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IPC IPC(8): G02B27/28
Inventor 柯昌剑钱路万助军潘登
Owner HUAZHONG UNIV OF SCI & TECH