FWDM-1521-7D-xx SFP Product Specification – September 2005
Finisar
IX.
Digital Diagnostic Functions
All Finisar SFPs support the 2-wire serial communication protocol outlined in the SFP
MSA
5
. These SFPs use an Atmel AT24C01A 128 byte E
2
PROM with an address of A0h
(see table below for E
2
PROM contents). For details on interfacing with the E
2
PROM, see
the Atmel data sheet titled “AT24C01A/02/04/08/16 2-Wire Serial CMOS E
2
PROM.”
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 Transceivers
8
(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
I C Clock Speed
Accuracy
Internal Transceiver
Temperature
Internal Transceiver
Supply Voltage
Tx Bias Curent
Tx Output Power
Received Average Power
Range
Internal Transceiver
Temperature
Internal Transceiver
Supply Voltage
Tx Bias Curent
Tx Output Power
Received Average Power
2
Symbol
DD
Temperatu
re
Min Typ
0
-3
-3
-10
-3
-3
Max
100,000
+3
+3
+10
+3
+3
Units Notes/Conditions
Hz
°C
%
%
dB
dB
Bus can be driven blind
Measured at controller IC
Measured at controller IC
DD
Voltage
DD
Bias
DD
TxPower
DD
RxPower
100% tested in production
tested at room temp to
±2
dB
100% tested in production
tested at room temp to
±2
dB
DD
Temperatu
re
-40
3.0
0
-10
-23
85
4.0
90
5
0
°C
V
mA
dBm
dBm
DD
Voltage
DD
Bias
DD
TxPower
DD
RxPower
©
Finisar Corporation September 2005 Rev.D
Page 7
FINISAR [ FINISAR CORPORATION. ]
