ディジタルコヒーレント通信用狭線幅半導体レーザー

摘要

Wavelength tunable lasers are key components as light sources in large capacity optical core networks that employ dense wavelength-division-multiplexing techniques. Digital coherent technologies are now being developed in order to increase the transmission capacity for next generation optical networks. In such systems, an advanced modulation/detection technique will be used, and low phase noise characteristics will be essential for tunable laser sources. This article reviews techniques for reducing the phase noise of tunable lasers.