155 Mb/s Logic Interface Laser
Transmitter for OC3/STM1
Preliminary Technical Data
XMT5370-155
Features
• SONET/SDH Compliant to
STM1 I-1, S-1.1
OC3 SR, IR-1
• –40
°
C to +85
°
C Operation
• Compact 20 Pin Package
• ECL/PECL Logic Interface
• Multisourced Pinout
• Fully Interchangeable High
and Low Power Versions
Description
The XMT5370-155 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 adjust-
ments are necessary. Finally, a
laser disable input is provided to
shut down the laser for standby
or test purposes.
The XMT5370-155 has -11 dBm
mean output power for short and
intermediate reach systems.
The XMT5370-155 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.
Applications
•
•
•
•
SONET/SDH Systems
Single Mode ATM
Fiber to the Home
Data Communications
Networks
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.
436
(5/97)
Connection Diagram
Top View
FIBER PIGTAIL
NC
LASER BIAS MONITOR (+)
NC
LASER BIAS MONITOR (–)
V
EE
V
CC
TRANSMIT DISABLE
V
CC
V
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
CC
LASER BACK FACET MONITOR (–)
DATA
DATA
V
EE
CASE GROUND (SEE NOTE BELOW)
V
CC
CASE GROUND (SEE NOTE BELOW)
Pin Descriptions
Pins 1, 3, 10, 20, NC:
These pins should not be con-
nected 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, V
EE
:
These pins are connected to
ground in +5 V systems and –5 V
in negative supply systems.
Pins 6, 8, 9, 12, 18, V
CC
:
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 V
EE
when open
circuited, enabling the
transmitter. It must be biased
within 3 V of V
CC
to disable.
Pins 11, 13, Ground:
The XMT5370-155 case is plastic,
therefore pins are not connected.
Pins 15, 16, DATA, DATA:
These are differential ECL inputs.
If open circuited they float to V
BB
(V
CC
–1.3 V).
Pin 17, Laser Back Facet
Monitor (–):
See Figure 2.
Pin 19, Laser Back Facet
Monitor (+):
See Figure 2.
V
CC
LASER
3 kΩ
PIN 2
10
Ω
3 kΩ
PIN 4
I
BIAS
V
EE
PIN 17
PIN 19
MONITOR
PHOTODIODE
3 kΩ
V
CC
MODULATION
CURRENT
3 kΩ
200
Ω
TO LASER BIAS
CONTROL CIRCUITRY
Figure 1. Laser Bias Monitor Circuitry.
Figure 2. Back Facet Monitor Circuitry.
437
XMT5370-155 Block Diagram
PHOTODIODE
(REAR FACET
MONITOR)
LASER
DATA
DATA
LASER
MODULATOR
ECL
INPUT
DISABLE
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 V
BB
. The
unused input then requires no
connection or biasing.
The disable function disables the
laser bias and modulator. The
switching threshold is V
CC
–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 V
CC
to disable.
The module provides the
necessary bias and modulation
control to maintain the extinction
ratio at better than 8.2 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.
438
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
Supply Voltage
Operating Case Temperature
XMT5370A-155
XMT5370B-155
Storage Temperature
Fiber Tensile Strength
Fiber Bend Radius
Lead Soldering (Temperature/Time)
Minimum
-
–40
0
–40
10
32
-
Nominal
-
-
-
-
-
-
-
Maximum
7
+85
+70
+85
-
-
+260/10
Units
V
°C
°C
°C
N/10s
mm
°C/Sec
Notes
-
-
-
-
1
-
-
Characteristics
Parameter
Center Wavelength
Spectral Width (RMS)
Average Output Power
Rise Time (10% - 90%)
Fall Time (10% - 90%)
Extinction Ratio
Bias Monitor
Rear Facet Monitor Output
Supply Voltage
Supply Current
Tx Disable
Output Waveform
Minimum
1261
-
–15
-
-
8.2
-
5
4.75
-
V
CC
–3.2
Nominal
Maximum
Units
-
1360
nm
-
4
nm
–11
–8
dBm
-
2
ns
-
2
ns
-
-
dB
0.1
-
mA/mV
-
50
mV
5.0
5.5
V
70
130
mA
-
V
CC
V
SONET/SDH Eyemask Compliant G.957
Notes
2
2
3
-
-
-
4
5
6
7
-
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 V
EE
+ 3.5 V nominal.
5. Common mode signal V
EE
+ 1.2 V nominal.
6. With V
EE
connected to -5 V, V
CC
must be at 0 V. With V
CC
at +5 V, V
EE
must be at 0 V.
7. End of life at Tmax.
439
Drawing Dimensions
L
20
11
C
1
B
A
10
D
J
H
∅G
DIM.
A
B
C
D
E
F
∅G
H
J
K
L
MIN.
32.9
–
16.0
–
2.6
–
–
2.7
–
–
400
NOM.
–
–
–
–
–
2.54
0.46
–
–
10.16
–
MAX.
33.2
17.5
16.3
9.27
2.95
–
–
3.2
4.64
–
1220
F
E
K
ALL DIMENSIONS IN MILLIMETERS
440
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