Phase-coherent repetition rate multiplication of a mode-locked laser from 40 MHz to 1 GHz by injection locking

TL;DR

This paper demonstrates a fiber-based method to multiply a mode-locked laser’s repetition rate from 40 MHz to 1 GHz using injection locking, maintaining phase coherence for potential applications in high-speed optical systems.

Contribution

It introduces a fiber-integrated injection locking technique to coherently multiply laser repetition rates from 40 MHz to 1 GHz, preserving phase coherence.

Findings

Repetition rate successfully increased to 1 GHz

Phase coherence maintained between master and slave lasers

System implemented predominantly in fiber

Abstract

We have used injection locking to multiply the repetition rate of a passively mode-locked femtosecond fiber laser from 40 MHz to 1 GHz while preserving optical phase coherence between the master laser and the slave output. The system is implemented almost completely in fiber and incorporates gain and passive saturable absorption. The slave repetition rate is set to a rational harmonic of the master repetition rate, inducing pulse formation at the least common multiple of the master and slave repetition rates.