All-optical tunable multichannel filter based on periodically polarized lithium niobate crystal

Abstract

The invention provides an all-optical tunable multichannel filter based on a periodically poled lithium niobate crystal and belongs to the field of optical communication and microwave photonics. According to the filter, the sum frequency effect in the second-order nonlinear effect of the periodically polarized lithium niobate crystal is utilized to realize the filtering of signals, simultaneous filtering of multiple channels can be realized by inputting the pump light with multiple wavelengths, and the central wavelength and extinction ratio of the filtering channels can realize the all-optical tuning; tuning characteristics of the channels are independent and do not influence each other, and the filter has the characteristics of simple structure, multi-channel simultaneous filtering, convenient tuning and the like.

Description

technical field

[0001] The invention belongs to the fields of optical communication and microwave photonics, in particular to an all-optical tunable multi-channel filter based on periodically polarized lithium niobate crystals. Background technique

[0002] In the field of optical communication and microwave photonics, optical fiber is often used as a physical medium for information transmission, forming a fiber optic communication network or a fiber optic microwave photonic system. In these transmission applications, the use of wavelength division multiplexing technology can greatly expand the transmission signal bandwidth on a limited physical medium. In the process of signal transmission, it is often necessary to process the communication signal or microwave signal modulated on the light, such as filtering is a common signal processing. The traditional processing method at the transmission intermediate node is to convert the optical signal into an electrical signal, and ...

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