Alcatel 1660SM Technical Handbook page 563

SFP OPTICAL MODULE
SFP optical module is a pluggable fiber optic transceiver that arises from a Multi–Source Agreement.
Optical wavelength could be B&W or colored conform to CWDM grid. Line bit–rate could be single speed
or multi–rate.
On COWLA2 it's for now foreseen the use of mono–mode, multi–rate B&W or multi–rate 8 wavelength
colored SFP, capable of maximum span budget of about 80 Km.
Photo detector transceiver and laser transmitter achieve respectively optical to electrical and electrical to
optical conversion;
In addition there are some configuration and alarm pins:
– Tx fault indicates a laser fault
– LOS specifies an optical loss of signal
– Presence reflects the insertion–extraction of the module
– Tx disable when set shuts down the laser
– Rate select is an optional command for data rate select for multi–rate transceiver.
These signals are input–output of FPGA and can be read–written using dedicated registers. Tx disable
and LOS are used by FPGA for ALS functionality.
Tx disable, LOS and Presence are also connected to RIBUS block for testing or future utilization.
SFP module includes a 512 bytes serial EEPROM, that contains inventory and vendor specific
information. This EEPROM can be read and written via ISPB bus.
SERIALIZER/DESERIALIZER
"Deserializer" main functions are clock recovery, data re–sampling and 1 to 16 de–serialization over a
continuous bit–rate from 30 Mb/s up to 3.2 Gb/s.
"Serializer" main functions are data re–timing and 16 to 1 serialization over a continuous bit–rate from 30
Mb/s up to 3.2 Gb/s.
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