FTLF1421S1XCL 2x10 Pin SFF Product Specification – March 2006

F i n i s a r

© Finisar Corporation March, 2006 Rev A

Page 6

Parameter

Symbol

Min

Typ

Max

Unit

Ref.

Transmitter

Monitor photodiode current monitor

Pmon+,

Pmon-

0

Vcc

V

1

Laser bias current monitor

Bmon+,

Bmon-

0

Vcc

V

2

Receiver

Received photocurrent

Rpd

0

1

mA

3

Photodiode responsivity

R

0.5

0.9

1.0

A/W

Applied voltage at PD pin

Vpd

2.4

Vcc

V

3

Notes:

1.

Pins 19 and 20 provide an analog voltage output proportional to the monitor photodiode current,

equivalent circuit.

2.

Pins 17 and 18 provide an analog voltage output proportional to the laser bias current, per the

circuit.

3.

Pin 1 is used to monitor the received photocurrent. It must be connected to a positive voltage

within the range specified above. The current that flows into this pin is the received photocurrent.

The received power is given by the photocurrent multiplied by the photodiode responsivity.

Vcc

10

Ω

3 K

Ω

3 K

Ω

Bmon+

Bmon-

Ibias

Vcc

200

Ω

3 K

Ω

3 K

Ω

Pmon+

Pmon-

Imon

Laser

Monitor

Photodidoe

Vpd

Receiver

Photodidoe

Ipd

Analog monitoring function connections.