Transfer device of all-optical wavelength based on lithium niobate fiber waveguide ring chamber

Abstract

The invention discloses an all-optical wavelength conversion device based on a lithium niobate optical waveguide ring cavity, which comprises a first optical coupler, an erbium-doped optical fiber amplifier, a polarization controller, a PPLN optical waveguide, and an optical An isolator, a second optical coupler and a pump light wavelength selector constitute a ring cavity laser with a built-in PPLN optical waveguide. The PPLN optical waveguide processes the signal light and the pump light generated by the internal lasing of the ring cavity laser to cause nonlinear effects to achieve wavelength conversion; the converted idle light is output from the second optical coupler. On the one hand, the present invention makes full use of two cascaded second-order nonlinear effects in the PPLN optical waveguide to realize various all-optical wavelength conversion functions, which greatly improves the flexibility of wavelength conversion; on the other hand, the ring cavity laser inside the device is used to generate pumping Light, get rid of the previous dependence on expensive external cavity lasers as external pump light sources, the device structure is simple and easy to implement, the cost is greatly reduced, and the operation is reliable.

Description

technical field [0001] The invention relates to the technical fields of nonlinear optical frequency mixing and all-optical signal processing, in particular to an all-optical wavelength conversion device based on a lithium niobate optical waveguide ring cavity. 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, four...

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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 conversion can save an external pump light source, but the tunable intracavity wavelength conversion cannot be realized because the pump light is located at the quasi-phase matching wavelength of the SHG process

In addition, the intracavity wavelength conversion based on SFG+DFG has not been reported so far because it needs to save two external pump light sources at the same time.

In addition, most of the existing wavelength conversions still stay in single-channel-single-channel wavelength conversion, for single-channel-dual-channel tunable wavelength conversion, Less attention has been paid to conversion, and simultaneous conversion of multiple channels.

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