V23832-T2431-M101

V23832-R421-M101

Description

Data Sheet

8

2003-11-19

Transmitter V23832-T2431-M101

The transmitter module converts parallel electrical input signals via a laser driver and a

Vertical Cavity Surface Emitting Laser (VCSEL) diode array into parallel optical output

signals. All input data signals are Multistandard Differential Signals (LVDS compatible;

LVPECL and CML is also supported because of the wide common input range). The

electrical interface (LVDS, LVPECL or CML) is selected by the supply inputs

V

data rate is up to 2700 Mbit/s for each channel. The transmitter module’s min. data rate

of 500 Mbit/s is specified for the CID

a lower disparity. The transmitter features active feedback of optical output power and

extinction ratio, which guarantees a constant power budget.

Unused channels can be forced to a quiescent state by applying e.g. a constant high

level to the input stage of these channels. The integrated alerter circuit (see “Laser Eye

Safety Design Considerations” on Page 12) will switch off the corresponding

transmitter output, which results also in a reduced power consumption. Unused

transmitter input channels can also be left open. The integrated swing detection circuit

will assure a quiescent output state for these channels.

A logic low level at –RESET switches all laser outputs off. During power-up –RESET

must be used as a power-on reset which disables the laser driver and laser control until

the power supply has reached a 3.135 V level.

The Laser Controller Up (LCU) output is low if a laser fault is detected or –RESET is

forced to low.

All non data signals have LVCMOS levels.

Transmission delay of the PAROLI system is

≤ 1 ns for the transmitter, ≤ 1 ns for the

receiver and approximately 5 ns per meter for the fiber optic cable.

Figure 4

Transmitter Block Diagram

1)

Consecutive Identical Digit (CID) immunity test pattern for STM-N signals,

ITU-T recommendation G.957 sec. II.

Input

Stage

Laser

Diode

Array

12

12

Data

Data In

Electrical

Input

Optical

Output

−RESET

Laser Controller

Up (LCU)

12

Laser

Driver

Laser

Control

12

LE

File: 3317