Optoway

TRSL-9115WG

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Tel: 886-3-5979798

Fax: 886-3-5979737

E-mail: sales@optoway.com.tw

http: // www.optoway.com.tw

12/1/2005 V3.0

3

ANALOG DIAGNOSTICS FUNCTIONS

Parameter

Symbol

Min

Typ

Max

Units

Notes

Transmitter

Laser Bias Current Monitor

Bmon+, Bmon-

0

Vcc

V

1

Monitor Photodiode Current Monitor Pmon+,Pmon-

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 VpdR pin

Vpd

2.4

Vcc

V

3

Notes: 1. PIN 17 and 18 provide an analog voltage output proportional to the laser bias current, based on the following

formula: Ibias = V (Bmon+ - Bmon-) / 10 Ω. See below the equivalent circuit.

2. PIN 19 and 20 provide an analog voltage output proportional to the monitor photodiode current, based on the

following formula: Imon = V (Pmon+ - Pon-) / 200Ω. See below the equivalent circuit.

3. PIN 1 is used to monitor the received photocurrent. It must be connected to a positive voltage within the specified

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

RX PD

T

I

Vpdr

Monitor PD

200ohm

VCC

control

circuit

Pmon+

Pmon-

3K

3K

LD

10ohm

VCC

bias

circuit

BM+

BM-

3K

3K

I bias

I mon

I pd

Analog Monitoring Function Connections