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By James J. Coleman, A. Catrina Bryce and Chennupati Jagadish (Eds.)

ISBN-10: 0123910668

ISBN-13: 9780123910660

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Nakamura et al. (1973) published results showing that an optically pumped GaAs diode laser with built-in corrugation feedback has narrowed spectral emission. Soon afterwards, Scifres et al. (1974) presented the first demonstration of an electrically pumped diode laser which included a uniform internal distributed feedback (DFB) grating. In the following decades, substantial performance improvements have been achieved, with grating stabilized single emitters now delivering >10W CW powers and peak power conversion efficiencies of >60%.

Experimental far field of eleven 21-element SCOWA arrays coherently SCOW Lasers and Amplifiers 29 The possibility of chip mode lasing at very high-drive currents due to imperfect AR coating is another limiting factor. We are therefore investigating a single-pass amplifier configuration that uses angled-facet amplifier elements to suppress any chip lasing and does not require an optical isolator. The challenge here is to obtain high efficiency from the singlepass amplifier elements. 4. 1. , 2005).

5mm typically have electrical-tooptical conversion efficiency (E–O) between 2% and 10%. The efficiency of an optical transmitter will be dominated by the final power amplifier. In an SOA, the photon density is low near the input facet, and carriers in this region are lost to spontaneous emission noise and nonradiative recombination heat. , 2008). The independent bias control of the input and output sections of the amplifier allows for a current reduction in the input section where the device is least efficient.

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Advances in Semiconductor Lasers by James J. Coleman, A. Catrina Bryce and Chennupati Jagadish (Eds.)


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