FWDM-1621-7D-xx SFP Product Specification – September 2005
IX.
Digital Diagnostic Functions
All Finisar SFPs support the 2-wire serial communication protocol outlined in the SFP
MSA5. These SFPs use an Atmel AT24C01A 128 byte E2PROM with an address of A0h
(see table below for E2PROM contents). For details on interfacing with the E2PROM, see
the Atmel data sheet titled “AT24C01A/02/04/08/16 2-Wire Serial CMOS E2PROM.”6
Finisar’s CWDM SFPs also support extended diagnostic features as described in Finisar
Applications Note AN-2030, “Digital Diagnostic Monitoring Interface for Optical
Transceivers”7, and additional information is available in SFF standard titled: “Digital
Diagnostic Monitoring Interface for Optical Transceivers8 (SFF-8472 rev9.3). A
controller IC that monitors system parameters such as laser current, module temperature,
transmitter power, and received power is accessible at address A2H.
I2C clock speed, digital diagnostic accuracy and digital diagnostic range can be found in
the table below. Values in the table represent the worst-case values over temperature,
voltage, and life.
Parameter
Symbol Min Typ Max Units Notes/Conditions
I2C Clock Speed
Accuracy
0
100,000
Hz
°C
%
Bus can be driven blind
Measured at controller IC
Measured at controller IC
Internal Transceiver
Temperature
Internal Transceiver
Supply Voltage
Tx Bias Curent
Tx Output Power
DDTemperature
DDVoltage
-3
-3
+3
+3
DDBias
DDTxPower
-10
-3
+10
+3
%
dB
100% tested in production
tested at room temp to ±2 dB
100% tested in production
tested at room temp to ±2 dB
Received Average
Power
DDRxPower
-3
+3
dB
Range
Internal Transceiver
Temperature
DDTemperature -40
85
°C
V
Internal Transceiver
Supply Voltage
Tx Bias Curent
Tx Output Power
Received Average
Power
DDVoltage
3.0
4.0
DDBias
0
90
5
-7
mA
dBm
dBm
DDTxPower
DDRxPower
-10
-30
Ó Finisar Corporation September 2005 Rev. F
Page 7
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