Page 731 - Introduction to Information Optics

Exercises / .1 5
12.25 E. P. Ippen, in Laser Applications to Optics and Spectraxcopy, vol. 2, Addison-Wesley,
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S, E. Miller and A. G. Chynoweth, eds., Academic Press, New York, 1979.
12.27 G. P. Agrawal, Fiber-Optic Communication Systems, 2nd edition, John Wiley & Sons. Inc..
New York, 1997
12.28 M. Klimek et al, 2000, "Advances in Passive Optical Networking," NFOECOO. 699.
12.29. Mary Jander, "PONs: Passive Aggression," Lightreading. com. 5/8/2000
12.30 A. A. M. Saleh, 2000, "Transparent Optical Networking in Backbone Networks," Optical
Fiber Conference 2000, ThD7-l, 62.
12.31 J. L. Zyskind, et al., 2000, "High-Capacity, Ultra- Long-Haul Transmission," NFOECOO.
342.
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50-GHz Channel Spacing in the Zero-Dispersion Region over 640 km of 1.55-jum Disper-
sion-Shifted Fiber," OFC'99, PD9, San Diego, CA, 1999.
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DBR Lasers," J. Quantum Electr., vol. 31, no. 1, 75.
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EXERCISES

12.1 One digital voice channel takes up 64 kb/s. How many voice channels
can an OC-192 (9.953.28 Gb/s) system deliver?
12.2 Decibel (dB) is commonly used in communications. It can represent
absolute signal power, defined as P (dBm) = 10 log (P(mW)), and
relative level, denned as AP (dB) = 10 Log (PI (mW)/P2 (mW)). 0 dBm
represents 1 mW and 3 dB represents two times. An optical amplifier
has —5 dBm total input from an 80-channel DWDM signal. Suppose
all channels have the same power. What is the input power to the
amplifier for each channel?
12.3 Noise power in a fiber-optic communication system depends linearly on
the measurement bandwidth. The OC-192 receiver requires that the
incoming signal has a minimum optical signal-to-noise ratio (OSNR) of
25 dB, for 0.1-nm bandwidth. What is the requirement of OSNR for
0.5-nm bandwidth?
12.4 In DWDM systems, one method is to use an optical bandpass filter
(BPF) to pick out a single channel from a composite DWDM signal,
and feed it to the receiver. Since the optical receiver reacts to a wide
spectrum of light, it falls on the optical BPF to suppress out-of-band
noises before they flood the receiver. If the receiver requires that the