All-optical code type conversion device based on nonlinear optical waveguide loop mirror

Abstract

The invention relates to an overall optical code converter for nonlinear optical wave guide ring shape lens. It comprises nonlinear optical wave guide, tunable extension line, tunable filter and two optical couplers, with the nonlinear optical wave guide being PPLN or ALGaAs, forming into imbedded nonlinear optical wave guide ring through connection with two optical couplers, whose one port provides pumping light to the entry port after connecting with the tunable extension line, one port of the No. 1 photographic coupler entering into input as the input return to zero signal code, the other port at the same side connected with tunable filter and providing output port. It uses nonlinear optical wave guide and frequency two step nonlinear effect, cascade and interference principle to realize non return to zero code optical code conversion. It is simple, reliable, good in extension, quick in response speed, free from influence of radiating noise.

Description

technical field [0001] The invention belongs to the field of nonlinear optical frequency mixing technology and the field of all-optical signal processing, and specifically relates to an all-optical code conversion device based on a nonlinear optical waveguide ring mirror. The device is based on periodic polarization inversion lithium niobate (PPLN ) or periodic domain inversion of aluminum gallium arsenide (AlGaAs) passive optical waveguide second-order and cascaded second-order nonlinear effects, using a fiber loop mirror structure to realize non-return-to-zero code to return-to-zero code tunable all-optical code conversion. Background technique [0002] The future all-optical network will combine two key technologies of wavelength division multiplexing (WDM) and optical time division multiplexing (OTDM). It is more suitable to use the return-to-zero code (RZ) with the network. Therefore, at the interface between the two, the all-optical code conversion between the non-ret...

AI Technical Summary

Problems solved by technology

However, there are still some shortcomings, such as the response speed is not fast enough to work at a high speed of 40Gbit / s, and the inevitable spontaneous emission noise in the active medium will also have an adverse effect on high-speed all-optical code conversion, etc. These cannot meet the requirements of future high-speed optical communication networks

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