Wavelength selecting switch

Abstract

The invention discloses a wavelength selecting switch. The wavelength selecting switch comprises a collimating input / output device (101), a polarizing and beam-splitting device (102), a beam-expanding and light-splitting prism group (103), a reflective grating (104), a focusing device (105) and an attenuating and switching device (106) which are sequentially arranged, wherein the beam-expanding and light-splitting prism group (103) comprises multiple pairs of prism pairs arranged in pairs, and performs beam expansion on linear polarized light; the reflective grating (104) splits the beam-expanded linear polarized light, and the beam-expanded linear polarized light runs through a part of the prism pairs in the beam-expanding and light-splitting prism group (103) for further expanding the light-splitting capability so as to uniformly disperse optical signals, corresponding to respective wavelengths, in input optical signals; the focusing device (105) focuses the uniformly-dispersed optical signals corresponding to the respective wavelengths into the attenuating and switching device (106); the attenuating and switching device (106) adjusts the attenuation amount and selects an output port. The wavelength selecting switch is compact in optical path structure and the number of packaging components is reduced.

Description

technical field [0001] The invention relates to an optical communication device, in particular to a wavelength selective switch with a compact structure, and belongs to the field of optical communication. Background technique [0002] According to the function and index requirements to be achieved, the optical path structure of all wavelength selective switches currently includes the following basic components: collimation input and output devices, beam expanders, beam splitters, focusing devices and attenuation switching devices. The collimation input and output device can be composed of fiber optic array + microlens array, or directly assembled from multiple single collimators; the beam expander can be composed of a group of prisms, or a lens with a certain focal length; The spectroscopic device is generally a grating, which can be a transmission grating or a reflective grating; the focusing device can be a set of lenses or a concave mirror, which is used to focus the ligh...

AI Technical Summary

Problems solved by technology

[0004] In view of the fact that the wavelength selective switch must contain the above-mentioned basic components, the fabrication of the wavelength selective switch often faces problems such as large optical path structure size and many package components.

In addition, in order to improve the bandwidth index, it is required to increase the light splitting ability of the grating, but this will increase the difference in the width and size of each wavelength unit in the attenuation switching device, thereby increasing the process difficulty of the attenuation switching component and causing the performance difference of each wavelength unit

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