Performance analysis of Doppler shift induced optical filtering and inband crosstalk penalties in intersatellite link optical switching nodes

In this work we have examined Doppler induced inband crosstalk penalty and signal distortion penalty due to cascaded optical devices in a switching node in a WDM lower earth orbit (LEO) IM/DD inter-satellite network. Our analysis showed that at a given Doppler shift both the above penalties can be minimized by judiciously choosing the cascaded optical devices bandwidth of over its nominal bandwidth. Probability of error due to in-band crosstalk has been evaluated and it is found that the signal-spontaneous emission beat noise can significantly increase in-band crosstalk power penalty by 7 dB at a ber 10⁻¹². We also observed noise floor at a certain crosstalk level of the switch.