A Grating-Type Polarization-Insensitive Multi-Channel WDM Receiver

A polarization-insensitive grating filter technology, applied in the field of optical communication, can solve the problems of high refractive index difference, large birefringence, and inability to apply optical fiber communication systems, etc., and achieve the effects of low cost, low crosstalk, and large production potential

Active Publication Date: 2021-11-19
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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  • A Grating-Type Polarization-Insensitive Multi-Channel WDM Receiver
  • A Grating-Type Polarization-Insensitive Multi-Channel WDM Receiver
  • A Grating-Type Polarization-Insensitive Multi-Channel WDM Receiver

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specific Embodiment

[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 polarization-insensitive multi-channel wavelength division multiplexing receiver. The two ends of the polarization rotating beam splitter are respectively connected to one end of the first and second connecting waveguides, and N receiving units are connected in series between the first and second connecting waveguides, and each receiving unit includes a bidirectional grating filter, a mode filter and a dual-port detector, N bidirectional grating filters and N mode filters are alternately connected in series and then connected between the straight-through end and the cross end of the polarization rotating beam splitter, the forward and the cross ends of each bidirectional grating filter Both reverse download waveguides are connected to a two-port detector. The invention realizes the polarization insensitivity of the multi-channel wavelength division multiplexing receiver, and obtains a multi-channel wavelength division multiplexing receiver with low insertion loss, low crosstalk and flat-top response in each channel, which is compatible with CMOS technology, It has the advantages of simple structure, low insertion loss and low crosstalk.

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 Patents(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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