A Tunable Femtosecond Modelocked Semiconductor Laser for Applications in OTDM-Systems

Reinhold LUDWIG  Stefan DIEZ  Armin EHRHARDT  Lothar KULLER  Wilhelm PIEPER  Hans G. WEBER  

IEICE TRANSACTIONS on Electronics   Vol.E81-C   No.2   pp.140-145
Publication Date: 1998/02/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Ultrashort Optical Pulse Technologies and their Applications)
modelocked semiconductor laser,  femtosecond optical pulses,  optical time division multiplexing,  all-optical clock recovery,  pump and probe measurements,  

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In this paper, we describe the properties of an external cavity modelocked semiconductor laser with a tunability of wavelength, pulse width and repetition rate. This modelocked laser generates optical pulses with pulse widths down to 180 fs and with repetition rates up to 14 GHz in a 120 nm wavelength range near 1. 55 µm or 1. 3 µm. The generated pulses are close to the transform limit and are therefore suitable for very high speed communication systems. In addition to the tunability, this pulse source is a compact and mechanically stable device. We report on two applications of this pulse source in optical time division multiplexing experiments. In the first example the modelocked laser is used as an all-optical clock recovery. In the second example the modelocked laser was used to characterize an interferometric switch by pump-probe experiments.