title: 40 nm wavelength tunable gain-switched optical comb source.
abstract: A wavelength tunable optical comb is generated based on the gain-switching of an externally seeded Fabry-Pérot laser diode. The comb consists of about eight clearly resolved 10 GHz coherent sidebands within 3 dB spectral envelope peak and is tunable over the entire C-band (1530 to 1570 nm). The optical linewidth of the individual comb tones is measured to be lower than 100 kHz, and the RIN of the individually filtered comb tones (<-120 dB/Hz) is shown to be comparable to the entire unfiltered comb (<-135 dB/Hz). Besides, expansion of the tunable gain switched comb is achieved with the aid of an optical phase modulator, resulting in near doubling of the number of comb tones.
authors.affiliation: The Rince Institute, Dublin City University, Glasnevin, Dublin 9, Ireland. zhourui85@gmail.com
authors.forename: Rui
authors.initials: R
authors.lastname: Zhou
authors.forename: Sylwester
authors.initials: S
authors.lastname: Latkowski
authors.forename: John
authors.initials: J
authors.lastname: O'Carroll
authors.forename: Richard
authors.initials: R
authors.lastname: Phelan
authors.forename: Liam P
authors.initials: LP
authors.lastname: Barry
authors.forename: Prince
authors.initials: P
authors.lastname: Anandarajah