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A Monolithic MQW InP-InGaAsP-Based Optical Comb Generator

Renaud, C C, Pantouvaki, M, Gregoire, S, Lealman, I, Cannard, P, Cole, S, Moore, R, Gwilliam, R and Seeds, A J (2007) A Monolithic MQW InP-InGaAsP-Based Optical Comb Generator IEEE Journal of Quantum Electronics, 43 (11). ISSN 0018-9197


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We report the first demonstration of a monolithic optical-frequency comb generator. The device is based on multi-section quaternary/quaternary eight-quantum-well InP-InGaAsP material in a frequency-modulated (FM) laser design. The modulation is generated using quantum-confined Stark-effect phase-induced refractive index modulation to achieve fast modulation up to 24.4 GHz. The laser was fabricated using a single epitaxial growth step and quantum-well intermixing to realize low-loss phase adjustment and modulation sections. The output was quasicontinuous wave with intensity modulation at less than 20% for a total output power of 2 mW. The linewidth of each line was limited by the linewidth of the free running laser at an optimum of 25 MHz full-width at half-maximum. The comb generator produces a number of lines with a spacing exactly equal to the modulation frequency (or a multiple of it), differential phase noise between adjacent lines of -82 dBc/Hz at 1-kHz offset (modulation source-limited), and a potential comb spectrum width of up to 2 THz (15 nm), though the comb spectrum was not continuous across the full span.

Item Type: Article
Additional Information: Published in <i>Journal of Quantum Electronics,</i> Vol. 43, Iss. 11. Copyright 2007 IEEE. Click <a href=>here</a> to access the journal's website.
Divisions: Faculty of Engineering and Physical Sciences > Electronic Engineering > Advanced Technology Institute > Ion Beam Centre
Depositing User: Mr Adam Field
Date Deposited: 27 May 2010 14:06
Last Modified: 23 Sep 2013 18:26

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