Tài liệu Fibre optic communication systems P7 ppt

... Chapter 6 that with the advent of optical amplifiers, fiber losses are no longer a major limiting factor for optical communication systems. Indeed, mod- ern lightwave systems are often limited by the ... are unsuitable for long-haul systems for which GVD must be compensated along the transmission line in a periodic fashion. What one needs for such systems is an all-optical, fiber-based,...

Ngày tải lên: 21/01/2014, 06:20

... commu- nication channel. The major component of optical transmitters is an optical source. Fiber -optic communication systems often use semiconductor optical sources such as light-emitting diodes ... 45 ◦ with Chapter 3 Optical Transmitters The role of the optical transmitter is to convert an electrical input signal into the cor- responding optical signal and then launch it into the opti...

Ngày tải lên: 24/12/2013, 01:16

... numbers. Chapter 6 Optical Amplifiers As seen in Chapter 5, the transmission distance of any fiber -optic communication sys- tem is eventually limited by fiber losses. For long-haul systems, the loss ... Several kinds of optical amplifiers were developed during the 1980s, and the use of optical amplifiers for long-haul lightwave systems became widespread during the 1990s. By 1996, optical am...

Ngày tải lên: 21/01/2014, 06:20

... aspects of coherent lightwave systems are reviewed in Section 10.6 where we also discuss the status of such systems at the end of 2001. 478 Fiber -Optic Communications Systems, Third Edition. Govind ... phase coherence of the optical carrier plays an important role in the implementation of such schemes, such optical communica- tion systems are called coherent lightwave systems. Coher...

Ngày tải lên: 21/01/2014, 06:20

... of the resulting optical signal. Most digital lightwave systems employ OOK in combination with PCM. 1.3 Optical Communication Systems As mentioned earlier, optical communication systems differ ... communication systems currently use optical fibers, the commonly used term for them is fiber -optic communication systems. The term lightwave system is also sometimes used for fiber -...

Ngày tải lên: 24/12/2013, 01:16

... an optical pulse would broaden on propagation inside the fiber. In some optical communication systems, the frequency spread ∆ ω is determined by the range of wavelengths ∆ λ emitted by the optical ... guiding 23 Fiber -Optic Communications Systems, Third Edition. Govind P. Agrawal Copyright  2002 John Wiley & Sons, Inc. ISBNs: 0-471-21571-6 (Hardback); 0-471-22114-7 (Electronic) 68 C...

Ngày tải lên: 24/12/2013, 01:16

... nonetheless useful for optical communication systems simply because of their higher sensitivity. Receiver sensitivity is an important issue in the design of lightwave systems and is discussed ... fluctuations in all optical receivers even when the incident optical power P in is constant. Of course, additional noise is generated if P in is itself fluctuating be- cause of noise produced by...

Ngày tải lên: 24/12/2013, 01:16

... progress Chapter 5 Lightwave Systems The preceding three chapters focused on the three main components of a fiber -optic communication system—optical fibers, optical transmitters, and optical receivers. In this ... constitute a basic element of all communication systems, including LANs, MANS, and other distribution networks. 5.2 Design Guidelines The design of fiber -optic communicati...

Ngày tải lên: 24/12/2013, 01:16

... Channel selection through a tunable optical filter. 8.2 WDM Components The implementation of WDM technology for fiber -optic communication systems re- quires several new optical components. Among them ... a device acts as an “optical tap” as it leaves the contents of the WDM signal intact. Chapter 8 Multichannel Systems In principle, the capacity of optical communication systems can...

Ngày tải lên: 21/01/2014, 06:20

... optical solitons into a practical candidate for modern lightwave systems [5]–[9]. In this chapter we fo- cus on soliton communication systems with emphasis on the physics and design of such systems. ... of solitons in optical fibers and their use for optical communications were suggested in 1973 [2], and by 1980 solitons had been observed experimentally [3]. The potential of solitons fo...

Ngày tải lên: 21/01/2014, 06:20