Coherent Lightwave Communications Technology

1. Front Matter

   Pages i-xiii

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2. Introduction to coherent lightwave communications

   • Kiyoshi Nosu

   Pages 1-11

3. Theory of optical coherent detection

   • Katsushi Iwashita

   Pages 13-41

4. Coherent transmission technologies

   • Katsushi Iwashita, Nori Shibata

   Pages 43-102

5. Optical filters and couplers

   • Hiromu Toba, Masao Kawachi, Masaru Kawachi

   Pages 103-127

6. Optical frequency division multiplexing systems

   • Osamu Ishida, Hiromu Toba, Nori Shibata

   Pages 129-188

7. Optical amplifiers for coherent transmission and optical FDM

   • Takeshi Ito, Kyo Inoue

   Pages 189-215

8. System applications

   • Takeshi Ito, Kiyoshi Nosu

   Pages 217-240

9. Epilogue

   • Kiyoshi Nosu

   Pages 241-249

10. Back Matter

    Pages 251-258

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This book covers a wide range of technical issues relating to lightwave technologies using high coherence lightwaves. Electromagnetic wave communication started when the first wireless system was invented by Marconi in 1895. However, we had to wait about one hundred years to realize a similar technology in the lightwave frequency region. The invention of lasers in 1960 and two technology innovations in 1970 -low loss silica fiber and semiconductor lasers operating at room temperature - promoted the development of fiber-optic transmission systems. The deployment of high-speed long-haul fiber-optic transmission systems has led to the formation of domestic and international trunk networks. The installed fiber cables in local loop plants provide multimedia communication services including broadband video. However, present lightwave communication systems do not fully utilize the fruitful potential oflightwaves, namely the capacity of extremely high frequency electromagnetic information carrier waves. The frequency oflightwaves used for fiber-optic transmission is about 200 THz 14 (2 x 10 Hz), and the frequency bandwidth of the fiber low loss region is about 13 20 THz (2 x 10 Hz). Recent developments of narrow spectrum width semiconduc­ tor laser and planar optical waveguide devices offer us the possibilities for a new generation of lightwave-based communication systems. This book focuses on system aspects ofthe new generation lightwave communi­ cation technologies such as optical frequency division multiplexing and coherent detection. Chapter 1 overviews lightwave communication system technology.

• communication
• communication systems
• detection
• development
• filters
• laser
• transmission

`Although this book is entitled Coherent Lightwave Technology, which is its major theme, much of the material is also applciable more widely to multichannel optical transmission systmes in general. The scope of the book is from the basic theory of coherent communications through to practical engineered systems and their design.'
British Telecommunications Engineering

• Fujitsu Laboratories Ltd, Japan

  Sadakuni Shimada

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