Dublin City University

Prince Anandarajah

Liam Barry

Eamonn Patrick Martin

Sylwester Latkowski

Slywester Latkowski

A gain switched dual comb spectroscopy device for spectroscopically detecting a sample substance, comprising a first slave laser light source configured to generate a first frequency comb having a first comb free spectral range, and a second slave laser light source configured to generate a second frequency comb having a second comb free spectral range which is different from the first comb free spectral range. A master laser light source is configured to inject seed light in to both slave laser light sources therewith to injection lock the generation of both the first and the second frequency combs. A photodetector part is arranged to combine the first and the second frequency combs and to detect a beat signal the spectrum of which comprises a third frequency comb including beat tones produced by interference between the combined first and second frequency combs.

Dual-comb spectroscopy

The present application provides an optical comb source in which the comb is produced by seeding a gain switched Fabry-P&#xe9;rot laser with light from a single mode laser, while at the same time driving the Fabry-P&#xe9;rot laser with a DC bias and RF signal.

Wavelength tunable comb source

The present application relates to comb frequency generator devices generally and more particularly to the use of comb generators for use in fibre optic communications. More particularly, the application provides a frequency comb generator device. The device comprises a laser (), a biasing circuit for providing a DC bias current (), an RF circuit () providing a RF signal and a drive circuit () for combining the RF signal with the DC bias current to provide a drive current to the laser (). With the DC bias current below threshold of the laser diode and RF bias with a frequence close to the relaxation ascillation frequency of the laser diode, a periodic pulse train is emitted with constant phase.

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Dublin, Ireland

Prince Anandarajah