XMT5160-155 Просмотр технического описания (PDF) - HP => Agilent Technologies

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XMT5160-155

155 Mb/s Logic Interface Laser Transmitters for OC3/STM1

HP => Agilent Technologies 

XMT5360-155 and XMT5160-155 Block Diagram

DATA

DATA

DISABLE

ECL

INPUT

LASER

MODULATOR

LASER

PHOTODIODE

(REAR FACET

MONITOR)

LASER

BIAS

DRIVER

LASER BIAS

MONITOR

LASER

BIAS

CONTROL

REAR FACET

MONITOR

Functional Description

The ECL input allows operation

from many logic families and

both single-ended or differential

signals. For single-ended

operation both DATA and DATA

are internally tied to a VBB. The

unused input then requires no

connection or biasing.

The disable function disables the

laser bias and modulator. The

switching threshold is VCC –3.2 V.

If this input is not connected the

module is enabled. This input

may be connected to a CMOS HI

or tied to VCC to disable.

The module provides the

necessary bias and modulation

control to maintain the extinction

ratio at better than 10:1 and the

waveform is compliant with

SONET/SDH Eyemask standard

G.957.

The laser bias control loop

compensates for temperature-

induced variations in laser

performance. The bias current

monitor indicates the amount of

dc current supplied to the laser.

(This is approximately the laser

threshold current).

The rear facet monitor is a signal

proportional to the laser output

power. This can be used as part

of a HI/LO light alarm.

In the absence of data the laser

will emit a mean optical power

within the specified limits. The

extinction ratio and duty cycle

distortion are specified assuring a

50% duty cycle at the correct

data rate.

450

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