HP XMT5170A-155-ST, XMT5170A-155-SC, XMT5170A-155-FP, XMT5170B-155-ST, XMT5170B-155-SC Datasheet

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

Preliminary Technical Data

XMT5170-155

Features

• SONET/SDH Compliant to

STM1 L-1.1
OC3 LR-1

• –40°C to +85°C Operation

• Compact 20 Pin Package

• ECL/PECL Logic Interface

• Multisourced Pinout

• Fully Interchangeable High
and Low Power Versions

Applications

• SONET/SDH Systems

• Single Mode ATM

• Fiber to the Home

• Data Communications
Networks

Description

The XMT5170-155 is a high
performance uncooled optical
laser transmitter for CCITT SDH
and ANSI SONET applications. It
is designed with an ECL/PECL
logic interface for 155 MBd
transmission.

The transmitter incorporates
several features which simplify
system design. It may be
operated with either +5 V or –5 V
power supplies. Standard 10 KH
ECL data interface enables direct
interface with PECL or ECL logic.
The compact transmitter module
contains a pigtailed laser, data
interface, bias and modulation
control circuitry. Thus, no
external components or adjust­ments are necessary. Finally, a

laser disable input is provided to
shut down the laser for standby
or test purposes.

The XMT5170-155 has -2 dBm
mean output power for long haul
systems.

The XMT5170-155 includes
analog outputs which are
proportional to laser current and
optical power. These may be used
with external circuitry to detect
end-of-life, or over temperature
conditions.

The transmitter is packaged in a
20 pin 0.4" pitch DIP. An
evaluation board is available for
this product. Contact your local
representative for more details.

Preliminary Product Disclaimer

This preliminary data sheet is provided to assist you in the evaluation of engineering samples of the product which is under development
and targeted for release during 1997. Until Hewlett-Packard releases this product for general sales, HP reserves the right to alter prices,
specifications, features, capabilities, function, manufacturing release dates, and even general availability of the product at any time.

424

(5/97)

Connection Diagram

Top View

FIBER PIGTAIL

LASER BIAS MONITOR (+)

LASER BIAS MONITOR (–)

V
V

TRANSMIT DISABLE

V
V

Pin Descriptions

Pins 1, 3, 10, 20, NC:

These pins should not be con­nected and should be left open
circuit on the application PCB.

Pin 2, Laser Bias Monitor (+):

See Figure 1.

Pin 4, Laser Bias Monitor (–):

See Figure 1.

Pins 5,14, VEE:

These pins are connected to
ground in +5 V systems and –5 V
in negative supply systems.

NC

NC

EE
CC

CC
CC

NC

1
2
3
4
5
6
7
8
9
10

20
19
18
17
16
15
14
13
12
11

NC
LASER BACK FACET MONITOR (+)
V
LASER BACK FACET MONITOR (–)
DATA
DATA
V
CASE GROUND (SEE NOTE BELOW)
V
CASE GROUND (SEE NOTE BELOW)

Pins 6, 8, 9, 12, 18, VCC:

These pins are connected to +5 V
for positive supply systems and
ground for –5.2 V systems.

Pin 7, Transmit Disable:

Pin 7 floats to VEE when open
circuited, enabling the
transmitter. It must be biased
within 3 V of VCC to disable.

Pins 11,13, Ground:

The XMT5170-155 case is plastic,
therefore pins are not connected.

CC

EE

CC

Pins 15, 16, DATA, DATA:

These are differential ECL inputs.
If open circuited they float to V

BB

(VCC –1.3 V).

Pin 17, Laser Back Facet
Monitor (–):

See Figure 2.

Pin 19, Laser Back Facet
Monitor (+):

See Figure 2.

V

CC

200 Ω

TO LASER BIAS
CONTROL CIRCUITRY

PIN 2

PIN 4

3 kΩ

3 kΩ

V

CC

LASER

10 Ω

I

BIAS

V

EE

MODULATION
CURRENT

PIN 19

PIN 17

MONITOR

PHOTODIODE

3 kΩ

3 kΩ

Figure 1. Laser Bias Monitor Circuitry. Figure 2. Back Facet Monitor Circuitry.

425

XMT5170-155 Block Diagram

DATA

DATA

DISABLE

ECL

INPUT

LASER

MODULATOR

LASER

LASER

BIAS

DRIVER

LASER

BIAS

CONTROL

PHOTODIODE
(REAR FACET

MONITOR)

LASER BIAS
MONITOR

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 dB 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.

426

Performance Specifications Absolute Maximum Ratings

Absolute maximum limits mean that no catastrophic damage will occur if the product is subjected to these ratings for short periods, provided
each limiting parameter is in isolation and all other parameters have values within the performance specification. It should not be assumed that
limiting values of more than one parameter can be applied to the product at the same time.

Parameter Minimum Nominal Maximum Units Notes

Supply Voltage - - 7 V ­Operating Case Temperature

XMT5170A-155 –40 - +85 °C-
XMT5170B-155 0 - +70 °C-

Storage Temperature -40 - +85 °C-
Fiber Tensile Strength 10 - - N/10s 1
Fiber Bend Radius 32 - - mm ­Lead Soldering (Temperature/Time) - - +260/10 °C/Sec -

Characteristics

Parameter Minimum Nominal Maximum Units Notes

Center Wavelength 1280 - 1335 nm 2
Spectral Width (RMS) - - 4 nm 2
Average Output Power –5 –2.5 0 dBm 3
Rise Time (10% - 90%) - - 2 ns ­Fall Time (10% - 90%) - - 2 ns ­Extinction Ratio 10 - - dB ­Bias Monitor - 0.1 - mA/mV 4
Rear Facet Monitor Output 5 - 50 mV 5
Supply Voltage 4.75 5.0 5.5 V 6
Supply Current - 70 130 mA 7
Tx Disable VCC –3.2 - V

CC

Output Waveform SONET/SDH Eyemask Compliant G.957

V-

Notes:

1. In a coaxial direction with fiber feed through.

2. Over operating temperature range. A narrower operating temperature range will result in a smaller center wavelength spread.
Contact Hewlett-Packard for details.

3. Other output power options are available. Contact Hewlett-Packard for details.

4. Common mode signal VEE + 3.5 V nominal.

5. Common mode signal VEE + 1.2 V nominal.

6. With VEE connected to -5 V, VCC must be at 0 V. With VCC at +5 V, VEE must be at 0 V.

7. End of life at Tmax.

427

Drawing Dimensions

L

20 11

C

110

B A

J

H

K

DIM. MAX.

A
B
C
D
E
F

∅G

H
J
K
L

ALL DIMENSIONS IN MILLIMETERS

MIN. NOM.

32.9
–

16.0
–

2.6
–
–

2.7
–
–

400

–
–
–
–
–

2.54

0.46
–
–

10.16
–

33.2

17.5

16.3

9.27

2.95
–
–

3.2

4.64
–

1220

F∅G

D

E

428

Ordering Information

XMT5170X 155 - XX

Allowable part numbers:
XMT5170A-155-FP
XMT5170A-155-ST
XMT5170A-155-SC
XMT5170B-155-FP
XMT5170B-155-ST
XMT5170B-155-SC

Connector:
FP = FC/PC Polish
ST* = ST
SC = SC

Temperature Option:
A = -40°C to +85°C
B = 0°C to +70°C

Model Name:
XMT5170

Handling Precautions

1. Normal handling precautions
for electrostatic sensitive
devices should be taken.

2. Semiconductor lasers can be
damaged by overloading or by
current surges. Appropriate
transient protection should be
taken.

*ST is a registered trademark of AT&T.

429