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Unformatted text preview: 342 Transmission System Engineering current to be increased as the laser ages, inducing a small wavelength shift. With typical channel spacings of 100 GHz or thereabouts, this is not a problem, but with tighter channel spacings, it may be desirable to operate the laser in constant current mode and tolerate the penalty (if any) due to the reduced output power. 5.10 Design of Soliton Systems Although much of our discussion in this chapter applies to the design of soliton systems as well, there are a few special considerations in the design of these systems, which we now briey discuss. We discussed the fundamentals of soliton propagation in Section 2.6. Soliton pulses balance the effects of chromatic dispersion and the nonlinear refractive index of the fiber, to preserve their shapes during propagation. In order for this balance to occur, the soliton pulses must have not only a specific shape but also a specific energy....
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- Spring '09