LCoS-based wavelength selective switch

Abstract

The embodiment of the invention discloses a WSS. The arrangement scheme of optical fiber array output ports of the WSS is that the centers of the output ports are arranged along a curve or a combinedline comprising line segments, and a straight line connected with the centers of any two output ports on the curve or the combined line cannot pass through an input port. A light beam received from the input port is diffracted to the output port through an LCoS panel, and a straight line through which each order of diffraction order generated by diffraction passes intersects with the curve or theline segment and has only one intersection point. According to the WSS provided by the embodiment of the invention, the number of output ports and the isolation performance can be effectively improved, and the practicability is high.

Description

technical field [0001] The present application relates to the field of optical communication, in particular to a wavelength selective switch based on an LCoS (Liquid Crystal on Silicon, liquid crystal on silicon) optical switching engine. Background technique [0002] With the rapid growth of network traffic and bandwidth, operators have increasingly urgent demands on the intelligent scheduling function of the underlying WDM network, which has led to ROADM (Reconfigurable Optical Add-Drop Multiplexer, Reconfigurable Optical Add-Drop Multiplexer ) is gradually adopted by more and more high-end operators' networks. After ROADM is introduced into the network, operators can quickly provide wavelength-level services, which facilitates network planning, reduces operating expenses, facilitates maintenance, and reduces maintenance costs. [0003] ROADM requires a considerable amount of WSS (Wavelength selective switch, wavelength selective switch) to optically interconnect the inpu...

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Problems solved by technology

However, in this case, it is possible for light from other diffraction orders to enter other output ports

These diffracted lights, such as 0th order, -1st order, +2nd order, etc., may cause crosstalk in subsequent optical links after entering the corresponding input port

for example, figure 1 , when the +1 order diffracted light needs to be output from the output port 3, the other several diffracted orders may be output from other ports as crosstalk light, thus forming the same frequency crosstalk, and once this part of the signal enters the corresponding output port It is difficult to eliminate and affect system performance

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