A driving module for multi-channel synchronous output laser light source

Abstract

The invention discloses a drive module for multi-channel synchronous output laser light source, which includes a multi-channel laser light source generation circuit, a temperature control circuit and a processor. The multi-channel laser light source generation circuit includes a trigger signal synchronization circuit, a drive circuit and a DFB laser Modulation circuit; any trigger signal synchronization circuit, drive circuit and DFB laser modulation circuit are connected to the processor, the temperature control circuit collects the temperature in the cavity of the DFB laser modulation circuit and feeds it back to the processor, and the processor controls the TEC The cooling plate regulates the temperature. The invention drives and enhances the output signal through the driving circuit with ultra-narrow pulse width, good stability, small output jitter, large extinction ratio, stable power and wavelength; the technical index of the driving circuit is consistent, and the multi-channel stable laser light source can be repeatedly realized output.

Description

technical field [0001] The invention relates to the field of lasers, in particular to a driving module for multi-channel synchronous output laser light sources. Background technique [0002] At present, the QKD (Quantum Key Distribution, Quantum Key Distribution) communication system is mainly based on the BB84 protocol. The coding of this protocol requires the sending end of the QKD system to prepare two sets of non-orthogonal single photons of four polarization states. [0003] In the existing engineering schemes, there are usually two methods to realize the preparation of single photons with four polarization states. [0004] One method is: use a laser LD as the light source, divide it into four parts by the beam splitter BS, and connect the intensity modulator IM, the polarization beam splitter PBS and the electronically controlled polarization controller EPC in sequence on the four optical paths after the splitting. The polarization state single photon preparation of e...

AI Technical Summary

Problems solved by technology

However, because method two uses four lasers LD as the system light source, if the phases of the output of the four lasers cannot be guaranteed, there will be hidden dangers in the system security.

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