Multi-wavelength laser

Abstract

The invention discloses a multi-wavelength laser, which comprises a reference wavelength tunable laser, N-1 subordinate wavelength tunable lasers, N beam splitters, a phase modulator and N-1 frequencydifference detection devices, wherein the reference wavelength tunable laser is connected with a beam splitter, the beam splitter comprises two output ports, and one of the output ports is connectedwith the phase modulator; the phase modulator is connected with the N-1 frequency difference detection devices respectively; the N-1 subordinate wavelength tunable lasers are in one-to-one correspondence with the remaining N-1 beam splitters and the N-1 frequency difference detection devices, the subordinate wavelength tunable lasers are connected with the corresponding beam splitters, each corresponding beam splitter comprises two output ports, and one of the output ports is connected with the corresponding frequency difference detection device; and N is a positive integer not less than 2. Compared with an existing multi-wavelength laser, the multi-wavelength laser disclosed by the invention has higher frequency offset precision as the multi-wavelength optical signals generated by the phase modulator have accurate frequency intervals.

Description

technical field [0001] The present application relates to the technical field of optical fiber communication, in particular to a multi-wavelength tunable laser. Background technique [0002] At present, the wavelength tunable laser is one of the very important optoelectronic devices in the optical fiber communication system. It can be used not only as the light source at the transmitting end, but also as the local oscillator laser at the coherent receiving end. As people's demand for system transmission capacity continues to increase, the single-wavelength transmission capacity can be increased to 100Gbit / s, 200Gbit / s, or even 400Gbit / s and higher by increasing the baud rate and modulation order of the transmission signal, but The increase of baud rate and modulation order will limit the performance of single-wave large-capacity transmission, resulting in a decrease in transmission distance. Multi-channel parallel transmission can reduce the single-wave rate and increase th...

AI Technical Summary

Problems solved by technology

[0005] The purpose of this application is to provide a multi-wavelength laser, which solves the problems of low frequency deviation accuracy and limited application scenarios of existing multi-wavelength light sources

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