Abstract
The maximum number of connectable laser diode optical switches (LDSWs) was studied through the baseband signal-to-noise ratio calculation. For an NRZ 100 Mbits−1 PCM-IM signal, 60 stages of LDSWs can be connected with a 6-nm optical bandpass filter inserted after the last stage at an input signal level of −30 dB m and an internal gain of 16 dB. A PCM-IM signal of 10 Gbits−1 can be transmitted through 130 stages of LDSWs at an internal gain of 8 dB and an input signal level of −20 dB m.
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