Wavelength selective switch

Abstract

The invention discloses a wavelength selective switch. The wavelength selective switch comprises an input fiber port, an output fiber port, a fiber collimator array, a polarization control unit, a beam shaping system, a chromatic dispersion unit, an achromatism processing unit and a miniature reflection switch engine, wherein the polarization control unit decomposes incident light signals into two parallel beams which are transmitted in the same direction and are identical in polarization direction, so that polarization dependent loss of an optical system is reduced; a miniature reflection unit of the miniature reflection switch engine has the characteristics of a high fill factor, high mirror surface flatness and the like, so that the characteristic of a superflat transmission band of the wavelength selective switch is achieved.

Description

technical field [0001] The invention relates to the fields of optical fiber communication systems and network optical wavelength switching devices, in particular to a wavelength selective switch. Background technique [0002] Wavelength Division Multiplexing (WDM) technology is more and more widely applied to optical communication networks, and its network topology has become more complex. Devices and equipment with intelligent functions such as wavelength routing on network cross nodes The demand is becoming stronger and stronger to realize flexible scheduling of services and effective management of bandwidth. However, the previous wavelength division multiplexing network is essentially a point-to-point line combination, and most optical layer networks can only be constructed through optical line systems implemented by terminal stations. The optical add-drop multiplexer (Optical Add-drop Multiplexer, OADM) that appeared later has gradually realized the evolution from point...

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Problems solved by technology

Later, in order to realize channel switching in more dimensional directions, the micromirror array adopts a two-dimensional structure, that is to say, the rotation direction of the mirror surface can be parallel to or perpendicular to the dispersion direction of the grating, although this WSS More input and output ports are realized, but more problems are introduced, such as slow channel switching speed, large crosstalk between channels, unbalanced channel signal loss, large passband gain jitter, etc., and stability is difficult to guarantee , it is difficult to apply to the industrial field

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