An Optical Filter with Bandwidth Compression

Abstract

The invention discloses an optical filter adopting bandwidth compression. The optical filter comprises a light input unit (1-1), a light splitting unit (1-2) and a reflecting unit (1-3), wherein a plurality of channels are formed in the light input unit (1-1), the light splitting unit (1-2) is located between the light input unit (1-1) and the reflecting unit (1-3), and the reflecting unit (1-3) and the channels of the light input unit (1-1) are arranged in an optical coupling manner; the channels of the light input unit (1-1) are distributed in a central symmetric manner and are in cascading connection, each pair of symmetrical channels is located in two-dimensional space and allows light incoming and outgoing for one time, and each outgoing channel is connected with the next incoming channel in sequence until the last pair of channels. With the adoption of the two-dimension central symmetric structure, the coupling error of the channels is reduced to the minimum, insertion loss after repeated cascading connection can be approximately taken as repeated accumulation of central elements, the multiplexing influence of an input end is low, and great compression of a bandwidth index is realized.

Description

technical field [0001] The invention provides an optical filter with bandwidth compression, which belongs to the field of optical communication and optical sensing. Background technique [0002] With the development of optical communication technology, especially the maturity and continuous improvement of DWDM technology, narrow-channel, high-speed communication systems are constantly being born. Optical filters are the basic devices of optical communication and optical sensing, and the basic technology to realize complex functions. Optical filters have become an integral part of these technologies or systems. The precise wavelength filtering capability will help realize the monitoring of system operation status and accurately complete complex and difficult functions such as multi-wavelength switching. [0003] With the improvement of communication requirements, the signal rate increases, the channel capacity increases, and more stringent standards are proposed for channel...

AI Technical Summary

Problems solved by technology

[0010] The domestic patent CN103257404A describes a cascading scheme that directly connects the output terminal to the input terminal twice and passes through the filter element. This scheme has limited bandwidth compression effect because it can only complete two cascading effects and does not have higher In terms of scalability, it does not have easy portability, so it can only be used as a limited bandwidth compression solution for a single device

It has great limitations in effect and applicability

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