Grating type multi-channel wavelength division multiplexing receiver insensitive to polarization

A polarization-insensitive, grating filter technology, applied in the field of optical communication, can solve the problems of large birefringence, high refractive index difference, and cannot be applied to optical fiber communication systems, and achieves low insertion loss, low cost, and large production potential. Effect

Active Publication Date: 2020-10-02
ZHEJIANG UNIV
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Problems solved by technology

However, due to the high refractive index difference and sub-micron cross-sectional size of silicon nanowires, silicon nanowires often have large birefringence, and most silicon-based wave division multiplexing devices are polarization-sensitive, which makes them unable to be applied to practical optical fibers. In the communication system

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  • Grating type multi-channel wavelength division multiplexing receiver insensitive to polarization
  • Grating type multi-channel wavelength division multiplexing receiver insensitive to polarization
  • Grating type multi-channel wavelength division multiplexing receiver insensitive to polarization

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[0052] The silicon nanowire optical waveguide based on silicon insulator (SOI) material is selected: the core layer is silicon material, the thickness is 220nm, and the refractive index is 3.4744; the lower cladding material is SiO 2 , with a thickness of 2 μm and a refractive index of 1.4404; the upper cladding material is SiO 2 , with a thickness of 1.2 μm, the design and simulation are carried out for CWDM4 devices in the O-band communication band, and N=4 at this time.

[0053] An adiabatic evolution coupling structure is employed for the mode demultiplexers (including the pre / post mode demultiplexers of each bidirectional grating filter).

[0054] For four multimode waveguide gratings, the selected parameters are that the total width of the grating is 850nm, the grating tooth depth is 170nm, the number of grating periods is 200, the period number of the front / rear gradient grating is 20, and the duty ratio of the grating is 0.5. Four more The periods of the mode waveguid...

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Abstract

The invention discloses a grating type multi-channel wavelength division multiplexing receiver insensitive to polarization. Two ends of a polarization rotary beam splitter are respectively connected with one ends of the first and second connecting waveguides; n receiving units are connected in series between the first connecting waveguide and the second connecting waveguide. Each receiving unit comprises a bidirectional grating filter, a mode filter and a dual-port detector; the N bidirectional grating filters and the N mode filters are alternately connected in series in sequence and then connected between the straight-through end and the cross end of the polarization rotation beam splitter, and the forward downloading end waveguide and the reverse downloading end waveguide of each bidirectional grating filter are connected to a dual-port detector. The polarization insensitivity of the multi-channel wavelength division multiplexing receiver is realized, the multi-channel wavelength division multiplexing receiver with low insertion loss, low crosstalk and flat response of each channel is obtained, and the multi-channel wavelength division multiplexing receiver has the advantages ofcompatibility with a CMOS process, simple structure, low insertion loss, low crosstalk and the like.

Description

technical field [0001] The invention belongs to a receiver in the field of optical communication, and in particular relates to a grating type polarization-insensitive multi-channel receiver. Background technique [0002] With the rapid development of "Broadband China" and the advent of the 5G era, the demand for ultra-high-capacity optical interconnection of data services is becoming increasingly urgent. As we all know, the Wavelength Division Multiplexing (WDM) technology is one of the important technologies for enhancing data communication interconnection. WDM technology combines two or more optical carrier signals of different wavelengths at the sending end through a multiplexer and couples them to the same optical fiber for transmission; at the receiving end, the optical carrier signals of each wavelength are demultiplexed The signal is separated and the original signal is restored. The general WDM technology includes dense wavelength division multiplexing (Dense WDM, ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/293H04B10/60H04J14/02
CPCG02B6/29325G02B6/2938G02B6/29397H04B10/60H04J14/02
Inventor 戴道锌刘大建
Owner ZHEJIANG UNIV
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