Fiber Optics

3

V23870-A2111/2-xx00 BIDI Pigtail SFF transceiver

The receiver component converts the optical serial data into PECL compatible electrical data (RD and RDnot). The

Signal Detect (SD, active high) shows whether an optical signal is present.

The transmitter converts PECL compatible electrical serial data (TD and TDnot) into optical serial data. Data lines

are differentially 100

Ω terminated.

The transmitter contains a laser driver circuit that drives the modulation and bias current of the laser diode. The

currents are controlled by a power control circuit to guarantee constant output power of the laser over temperature

and aging.

The power control uses the output of the monitor PIN diode (mechanically built into the laser coupling unit) as a

controlling signal, to prevent the laser power from exceeding the operating limits.

Single fault condition is ensured by means of an integrated automatic shutdown circuit that disables the laser

when it detects laser fault to guarantee the laser Eye Safety.

The transceiver contains a supervisory circuit to control the power supply. This circuit makes an internal reset

signal whenever the supply voltage drops below the reset threshold. It keeps the reset signal active for at least

140 milliseconds after the voltage has risen above the reset threshold. During this time the laser is inactive.

The laser can be disabled by the TxDis input.

Technical Data

The electro-optical characteristics described in the following tables are valid only for use under the recommended

operating conditions.

Recommended Operating Conditions

Symbol

Min.

Typ.

Max.

Unit

Operating Temperature Range at Case

1

0

+70

°C

Operating Temperature Range at Case

2

-40

+85

°C

Power Supply Voltage

3.1

3.3

3.53

V

Transmitter

Data Input Differential Voltage

250

1600

mV

Receiver

Input Center Wavelength

λ

C

1500

1600

nm