Full optical wavelength converting device based on non-linear optical waveguide

Abstract

The invention discloses an all-optical wavelength converting device based on non-linear optical waveguide. The device comprises a first optical coupler, an erbium-doped optical fiber amplifier, a polarization controller, a PPLN waveguide, an optical isolator, a second optical coupler and a pump optical wavelength selector, which are connected in sequence by optical paths in clockwise direction to form an annular cavity laser with the built-in PPLN optical waveguide. The first optical coupler and the second optical coupler respectively provide a signal light input port and a converted idle light output port for the external. The non-linear optical waveguide is the PPLN optical waveguide and the pump optical wavelength selector is a dual wavelength selector or a multiple wavelength selector. The pump light produced by signal light and the inner of the annular cavity by lasing carries out non-linear mutual interaction in the PPLN optical waveguide to generate converted idle light, so as to realize wavelength converting. The device can realize tunable wavelength converting of single-channel to dual-channel and single-channel to multi-channel (broadcasting type) and input and output tunable wavelength converting with the advantages of flexible converting function, compact and easily realizable structure and low cost.

Description

technical field [0001] The invention relates to the technical field of nonlinear optical frequency mixing and the technical field of all-optical signal processing, in particular to an all-optical wavelength conversion device based on a nonlinear optical waveguide. Background technique [0002] The all-optical wavelength converter can completely copy the information carried by one optical wavelength to another optical wavelength, and is an indispensable key device in the future Dense Wavelength Division Multiplexing (DWDM) optical network. Wavelength conversion technology helps to realize wavelength reuse, effectively perform dynamic routing selection, reduce network congestion and blocking rate, and then improve the flexibility and scalability of optical networks. Currently commonly used all-optical wavelength conversion technologies mainly include: cross-gain modulation (XGM), cross-phase modulation (XPM), nonlinear optical loop mirror (NOLM), laser gain saturation effect, ...

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Problems solved by technology

However, in the reported SHG+DFG and SFG+DFG wavelength conversion schemes, it is necessary to use an expensive external cavity laser as an external pump light source, especially the wavelength conversion based on SFG+DFG requires the use of two external pump light sources at the same time , which greatly increases the complexity of the wavelength converter and increases the cost of the system

Although C.Q.Xu et al in the article "Intracavity wavelength conversions employing a MgO-doped LiNbO 3 quasi-phase-matched waveguide and an erbium-doped fiber amplifier," J.Opt.Soc.Amer.B, vol.20, No.10, pp.2142-2149, Oct.2003, proposed based on SHG+DFG The intracavity wavelength conversio

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