V23818-N15-L6xx

Description

Data Sheet

9

2003-09-10

Functional Description

This transceiver is designed to transmit serial data via single mode fiber.

Figure 9

Functional Diagram

The receiver component converts the optical serial data into an electrical data (RD+ and

RD–). The Signal Detect output (SD) shows whether an optical signal is present.

The transmitter part converts electrical LVPECL compatible serial data (TD+ and TD–)

into optical serial data.

The module has an integrated shutdown function that switches the laser off in the event

of an internal failure.

Reset is only possible if the power is turned off, and then on again. (V

V

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.

File: 1357

Laser

Driver

Laser

Monitor

Power

Control

Receiver

SD

PDBias

TD+

RD+

RD-

BMon-

BMon+

TD-

Tx

Coupling Unit

Rx

Coupling Unit

e/o

o/e

o/e

TDis

PMon-

3k

3k

3k

10

Single

Mode

Fiber

Automatic

Shut-Down

PMon+

200

3k