Driving module of multi-path synchronous output laser light source

Abstract

The invention discloses a driving module of a multi-path synchronous output laser light source, the driving module comprises a multi-path laser light source generation circuit, a temperature control circuit and a processor, and is characterized in that the multi-path laser light source generation circuit comprises a trigger signal synchronization circuit, a driving circuit and a DFB laser modulation circuit; any one of the trigger signal synchronization circuit, the driving circuit and the DFB laser modulation circuit is connected with the processor, the temperature control circuit collects the temperature in a cavity of the DFB laser modulation circuit and feeds back the temperature to the processor, and the processor adjusts the temperature by controlling a TEC refrigeration sheet. The enhanced output signal is driven by the driving circuit to have ultra-narrow pulse width, good stability, small output jitter, large extinction ratio and stable power and wavelength; the driving circuit is good in technical index consistency, and can repeatedly realize multi-path stable laser light source 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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