Digital Processing: Optical Transmission and Coherent Receiving Techniques
2014 by Taylor & Francis Group, LLC
Le Nguyen Binh
Optical communication technology has been extensively developed over the last 50 years, since the proposed idea by Kao and Hockham [1]. However, only during the last 15 years have the concepts of communication foundation, that is, the modulation and demodulation techniques, been applied. This is possible due to processing signals using real and imaginary components in the baseband in the digital domain. The baseband signals can be recovered from the optical passband region using polarization and phase diversity techniques, as well as technology that was developed in the mid-1980s. The principal thrust in the current technique and technology differs distinctively in the processing of baseband signals in the discrete/sampled digital domain with the aid of ultra-high-speed digital signal processors and analog-to-digital and digital-to-analog converters. Hence, algorithms are required for such digital processing systems. Over the years, we have also witnessed intensive development of digital signal processing algorithms for receivers in wireless transceivers, and especially in band-limited transmission lines to support high-speed data communications [2] for the Internet in its early development phase. We have now witnessed applications and further development of the algorithms from wireless and digital modems to signal processing in lightwave coherent systems and networks. This book is written to introduce this new and important development direction of optical communication technology. Currently, many research groups and equipment manufacturers are attempting to produce real-time processors for practical deployment of these DSPbased coherent transmission systems. Thus, in the near future, there will be new and significant expansion of this technology due to demands for more effective and memory-efficient algorithms in real time. Therefore, the author believes that there will be new books addressing these coming techniques and technological developments.
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