Ultra-Fast Semiconductor Laser Sources
The chapter focuses on ultra-fast light sources for achieving small footprint and lower-power-consumption optical transceivers and covers various important light sources such as directly-modulated diode lasers with high optical-gain materials, low chirp e
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Ultra-Fast Semiconductor Laser Sources Masahiro Aoki and Ute Troppenz
Abstract The chapter focuses on ultra-fast light sources for achieving small footprint and lower-power-consumption optical transceivers and covers various important light sources such as directly-modulated diode lasers with high optical-gain materials, low chirp externally-modulated diode lasers, and ultra-fast diode lasers with new structure and modulation scheme. The chapter starts with an in-depth theoretical treatment of key characteristics and dependences, illustrates typical realizations of ultra-fast diode lasers and integrated laser-modulators, and includes relevant operation and performance characteristics as well. In response to strong demand for datacom and access network applications selected variants of edge emitting transmitters are presented with particular emphasis on spectral and bandwidth efficiency.
4.1 Introduction Since the recovery from the ‘dot-com bubble’ (or ‘information technology bubble’) that occurred at the beginning of this century, demand for highly efficient transmission of huge amounts of data has soared with the explosive growth of broadband/broadgather data networks. Core/edge routers, switches, and data servers are now essential for the information and communications technology (ICT) that provides the infrastructure for our daily lives and our business activities in today’s ICTbased society. High-end ICT equipment depends heavily on fast optical data transmission technologies. Such technologies are essential not only in communication networks (for both telecommunications and mobile backhaul communication), but also in storage networks (so-called fiber channels) as well as in local area networks.
M. Aoki Center for Technology Innovation, Research & Development Group, Hitachi Ltd., 1-1, Omika 7, Hitachi-city, Ibaraki, Japan e-mail: [email protected] U. Troppenz (B) Fraunhofer Institute for Telecommuncations, Heinrich-Hertz-Institute, Einsteinufer 37, 10587 Berlin, Germany e-mail: [email protected] © Springer International Publishing Switzerland 2017 H. Venghaus, N. Grote (eds.), Fibre Optic Communication, Springer Series in Optical Sciences 161, DOI 10.1007/978-3-319-42367-8_4
M. Aoki and U. Troppenz Fig. 4.1 Footprint area and power consumption of 10 Gbit/s optical transceivers
Common technological keys enable high data throughput, high port densities and at the same time cost effectiveness. The total system performance depends heavily both on the data throughput of each channel port and on the integration density determined by the assembly size and power consumption of the components. That is why gigabit-per-second (Gbit/s) class optical transceivers with low power consumption and small footprints are so important. An example of the technology trend of optical transponders used for 10 Gbit/s systems is shown in Fig. 4.1, which plots the relationship between module footprint and total power consumption for several types of standard transceiver modules. The standard 10 Gbit/s optical
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