Optical Communication systems

In Optical Communication systems based on Wavelength Division Multiplexing, N signal laser beams at N different wavelengths (each carrying modulated user information) are coupled into the CIC and propagate down the fiber along with the pump.

While the pump ``loses'' photons to excite the ions as it propagates, the signals stimulate emission from the excited ions and ``gain'' photons.Since the probability of stimulated emission depends on the photon wavelength, so does the Gain. The Gain clearly also depends on the total number of excited ions in the fiber, since the more the ions, the larger the average number of stimulated emissions per input photon.

June 17, 2011

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