Method for manufacturing all-optical wavelength convertor with tunable non-periodic broadband

Abstract

The invention relates to a method for manufacturing an all-optical wavelength convertor with tunable non-periodic broadband, and belongs to the technical field of optical communication. The method comprises that: a magnesium doped lithium niobate wafer is selected, a titanium diffused waveguide structure is manufactured on the wafer, and a polarization direction of each electric domain area in anoptical superlattice is calculated; the wafer is subjected to room temperature electric field polarization to change the polarization direction in the electric domain according to obtained positive and negative domain arranging order, namely the wafer is subjected to the room temperature electric field polarization to realize periodic reversal of a crystal poling domain so as to realize non-periodic optical superlattice in a crystal; and finally, a polaroid sheet is arranged in front of a light transmitting light path of the wafer to obtain the all-optical wavelength convertor with tunable non-periodic superlattice wavelength. The all-optical wavelength convertor reduces cost, can overcome the defects of sunken conversion efficiency and occupation of communication wavelength when frequency doubling and difference frequency are in cascade connection, and realizes ultra wide band N*M wavelength channel conversion on the premises of greatly improving the conversion efficiency and not changing wavelength conversion output spectrum.

Description

technical field [0001] The invention relates to a manufacturing method of a device in the technical field of optical communication, in particular to a manufacturing method of a broadband tunable all-optical wavelength converter based on aperiodic optical superlattice dual-wavelength pumping. Background technique [0002] Existing wavelength conversion devices mainly include cross-gain modulation and cross-phase modulation wavelength converters based on Semiconductor Optical Amplifier (SOA), and Mach-Zehnder (Mach-Zehnder) wavelength converters. Amplitude, frequency, and phase all have defects of incomplete transparent conversion; based on SOA or passive waveguide, such as four-wave mixing of optical fiber, although it is a completely transparent all-optical conversion, it is a third-order nonlinear process and has low conversion efficiency. problems, and this wavelength converter is noisy, easy to cause crosstalk, and its application is limited; in general, the second-order ...

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Problems solved by technology

The secondary cascade effect used in the wavelength converter based on the optical superlattice waveguide structure can be divided into two categories: one is the single-pump frequency doubling and difference frequency cascade effect, such as: based on the frequency doubling and difference frequency cascade effect The manufacturing method of the wavelength-tunable broadband all-optical wavelength converter has the following disadvantages: the nonlinear coefficient of frequency doubling is not large, and a high pump optical power is required to obtain a considerable conversion efficiency, which is different from the low required in optical communication. The pump power threshold does not match. In the single pump wavelength conversion scheme, when the wavelength of the signal light approaches the wavelength of the pump light, the conversion efficiency will be depressed, so some channels near the wavelength of the pump light have to be discarded; the other type is Double pumping (dual pumping refers to two pump sources) and frequency and difference frequency cascade effect, in this type of method, the signal light and converted light are distributed on both sides of the pump light, so at least one wavelength channel is occupied, no Conducive to the full use of the communication band

The wavelength conversion uses a single-pump frequency doubling process, and there is a problem that the single-pump power threshold is too high, one wavelength channel is occupied, and the conversion efficiency will be depressed.

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