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Chapter 12: Optical performance monitoring of optical phase-modulated signal... - Pg. 319

CHAPTER Optical performance monitoring of optical phase­modulated signals 12 Bartlomiej Kozicki NTT Network Innovation Laboratories, NTT Corporation, Japan 12.1 INTRODUCTION The continuing growth of the traffic volume generated by broadband Internet connections, distributed storage services, or cloud/grid computing is placing a rising demand on network operators to provide increasing amounts of bandwidth. This is expected to occur without significant changes in pricing of the services, which forces network operators to look for novel solutions in the field of optical transport networks. In order to take advantage of the available resources efficiently, the envi- saged transparent optical network will accommodate dense wavelength-division-multiplexed 1