High speed modulation of semiconductor lasers pdf

The fast modulation of lasers is a fundamental requirement for applications in optical communications, highresolution spectroscopy and metrology. An overview is given of the direct modulation performance of highspeed semiconductor lasers, the highspeed response characteristics are described using a. Bistability, high speed modulation, noise and pulsations. Shaping current waveforms for direct modulation of semiconductor. The push for higher modulation frequencies, thereby allowing greater data rates, has motivated the. Highspeed modulation of semiconductor lasers ieee journals. Pdf highspeed modulation lasers for 100gbe applications. Highpower, 532 nmwavelength compact green laser module with high efficiency, highspeed modulation capability 19 january 2012 figure 1. Index terms semiconductor lasers, intersymbol interfer ence, time. Highspeed qmodulation of injectionlocked semiconductor. Highspeed modulation of a terahertz quantum cascade laser. A number of interesting applications exist for the direct modulation of semiconductor lasers at frequencies ranging from 1 to 10 ghz. The resonance frequency of directlymodulated lasers has been demonstrated up to 30 ghz.

In this thesis, experimental techniques for characterizing the highspeed performance of a semiconductor laser using electrical modulation and relative intensity. Ecent developments in semiconductor laser fabrication have led to dramatic improvements in highspeed direct modulation performance. Technical achievements as well as an improved understanding of the role of carrier dynamics in the modulation response have made much. For example, analog microwave modulation could be employed in a lowloss optical fiber entrance link from an antenna to a receiver panel several kilometers away. For bias cur rents above 53 ma, the peak height mp decreases due to the increasing gain compression term. Detunedloading effects on directlymodulated highspeed lasers. Highspeed direct modulation of semiconductor lasers. Furthermore, increased damping at higher resonance frequencies limit the maximum bandwidth to 40 ghz. This thesis describes seven different subjects relevant to semiconductor laser diodes which fall in the following three categories. The push for higher modulation frequencies, thereby allowing greater data rates, has motivated the scientific community for several decades. Wideband telecommunications require pulse code modulation pcm at bit rates in the neighborhood of. On ed32, highspeed modulation of semiconductor lasers. We propose a novel approach for highspeed direct modulation of optically injectionlocked semiconductor lasers by modulating the photon lifetime or the qfactor.

Semiconductor lasers are an integral part of highspeed telecommunications. High speed modulation of semiconductor lasers request pdf. High speed modulation of semiconductor lasers integrated. Highpower, 532 nmwavelength compact green laser module. The in tensity and frequency of semiconductor lasers can be conveniently modulated by modulating the current to the laser. Semiconductor lasers are an integral part of high speed telecommunications. The high speed direct modulation of semiconductor lasers has made tremendous progress since the early works of suemune et al.