Optimized pulse source based on a gain-switched laser diode in conjuction with a non-linearly chirped grating for 40 Gbit/s systems
Kaszubowska-Anandarajah, AleksandraORCID: 0000-0003-4811-9273, Clarke, Aisling M., Reid, Douglas A., Edvell, G., Roumieux, S., Anandarajah, Prince M.ORCID: 0000-0001-7335-8044, Barry, Liam P.ORCID: 0000-0001-8366-4790 and Harvey, John D.
(2004)
Optimized pulse source based on a gain-switched laser diode in conjuction with a non-linearly chirped grating for 40 Gbit/s systems.
In: LEOS 2004 - The 17th Annual Meeting of the IEEE Lasers and Electro-Optics Society, 7-11 Nov 2004.
A technique based on the design of an optimized source of pico-second optical pulses, which exhibits excellent temporal and spectral purity, is presented. The procedure entails an initial complete intensity and chirp characterization of pulses, from an externally injected-gain switched laser (EI-GSL), using the technique of frequency resolved optical gating (FROG). This characterization yields the parameters that are required for the design of a non-linearly chirped fibre Bragg grating (NC FBG) with a chirp profile that is opposite to that measured across the pulse. By employing the tailor made NC FBG after the gain-switched laser, direct compression of the gain-switched pulses is achieved, to obtain pedestal-free, near transform-limited, 7 ps pulses. The system viability, characterized by simulations, portrays a 6 dB difference in performance between a pulse source with insufficient TPSR and one that exhibits adequate TPSR &(ge; 30 dB).