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100G QSFP28 LR4 and CWDM4 Initialization Application Note Rev B

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100G QSFP28 LR4 and CWDM4 Initialization Application Note Rev B

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The purpose of this application note is to document the recommended power-on initialization sequence of Finisar’s 100 Gigabit Ethernet QSFP28 LR4 and CWDM4 modules. At the time of writing this application note, the affected part numbers are FTLC1151xDPL (25/28G) 10km LR4 and FTLC1152xGPL (25/28G) 2km CWDM4. Finisar’s QSFP28 modules implement a transmit input equalizer function that is designed to compensate the ISI and jitter, to provide an open eye to the transmit CDR (clock and data recovery). Equalization is a signal processing technique that boosts the high frequency component of the signal and reduces ISI.

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