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Chapter 5 Transmission System Engineering > 5.6 Crosstalk - Pg. 304

304 Transmission System Engineering l 90% Data channels 10% 10% 90% Data channels l Loop filter Figure 5.8 Optical automatic gain control circuit for an optical amplifier. loop is encountered with amplifiers in the loop, and the total gain in the loop is comparable to the total loss in the loop, the loop may begin to lase. The effect here is similar to the optical automatic gain control circuit that we discussed in Section 5.5.5, but in this case lasing loops can cause power to be taken away from live channels and distributed to the channel that is lasing--a highly undesirable attribute. Note that