FTLF1322S2xTR 2x10 Pin SFF Product Specification – October 2006
Finisar
VIII. Analog Diagnostics Functions
(T
op
= -40 to 85
°C,
V
CC
= 3.00 to 3.60 Volts)
Parameter
Transmitter
Monitor photodiode current monitor
Laser bias current monitor
Symbol
Pmon+,
Pmon-
Bmon+,
Bmon-
Min
0
0
Typ
Max
Vcc
Vcc
Unit
V
V
Ref.
1
2
Notes:
1. Pins 19 and 20 provide an analog voltage output proportional to the monitor photodiode current,
per the following formula: I
BIAS
= .V(Pmon+ - Pmon-) / 200Ω. The figure below shows the
equivalent circuit.
2. Pins 17 and 18 provide an analog voltage output proportional to the laser bias current, per the
following formula: I
BIAS
= .V(Bmon+ - Bmon-) / 10Ω. The figure below shows the equivalent
circuit.
3.
Vcc
Laser
3 KΩ
Bmon+
10
Ω
Bmon-
3 KΩ
Ibias
Imon
3 KΩ
200
Ω
Pmon-
Vcc
Monitor
Photodidoe
3 KΩ
Pmon+
Analog monitoring function connections.
©
Finisar Corporation October, 2006 RevD
Page 6
FINISAR [ FINISAR CORPORATION. ]
