Data
sheet
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Thinking optical solutions
4 - 155 Mb/s
Single-Mode
OSC Laser, 1510 nm
Specifically designed for use as a low speed out of band
optical service channel for optical amplifiers. The laser
is available in a low-inductance 14-pin butterfly package
with single-mode connectorized fiber-optic pigtail with
a rated peak output power of 2 mW. At 1510 nm,
the LC151B-20 does not interfere with WDM traffic
and operates outside the normal EDFA gain region.
The high reliability buried hetero-structure DFB laser chip
ensures the reliability of the LC151B-20 over the entire range
of recommended operating conditions.
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Features
Wavelength 1510 nm
Designed to operate
at 4 Mb/s - 155 Mb/s
Low threshold, high reliability
BHet laser chip
Hermetically sealed 14 pin high
speed butterfly package
High output power 2 mW
minimum CW
Internal InGaAs monitor
photodiode
Available with several optical
connector options
Applications
Optical Service Channel (OSC)
applications in DWDM
transmission systems using
optical amplifiers.
Parameter
Conditions
Min
Max
Unit
Operating temperature
-40
+70
C
Storage temperature
-40
+75
C
Laser forward current above Ith
100
mA
Laser reverse voltage
2
V
Monitor diode bias
-18
V
Fibre bend radius
30
mm
Absolute Maximum Ratings
Tcase = 25C unless otherwise stated
Figure 1: Schematic Diagram
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Parameter
Condition
Min
Typ
Max
Unit
Submount temperature
25
35
C
Threshold current (I
th
)
SOL
5
30
mA
Rated mean output power
50% duty
1.0
mW
Forward voltage
2 mW peak
2
V
Modulation current
2 mW peak
22
67
mA
Mean wavelength
10 Mb/s
1503
1518
nm
Monitor current
1 mW output
65
695
A
Monitor dark current
5
50
nA
Heatpump current
70C case/25C submount
800
mA
Heatpump voltage
70C case/25C submount
1.3
2
V
Bandwidth
200
MHz
Sidemode suppression ratio
Rated ouput power
-35
dB
Spectral width
@ -20 dB
0.4
nm
Kink
To 120% peak
-20
20
%
Slope SAT
To 120% peak
-35
35
%
Parameters
Conditions: Monitor bias -5V
Package Pin Configuration
1 4
1 3
1 2
1 1
1 0
9
8
1
2
3
4
5
6
7
PIN #
Name
PIN #
Name
1
Thermistor
14
No connection
2
Thermistor
13
Ground
3
LD cathode
12
LD anode
4
Monitor anode
11
Ground
5
Monitor cathode
10
No connection
6
TEC (+)
9
Ground
7
TEC (-)
8
Ground
Connections
Figure 2: Pin Configuration
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Package Outline Drawing and Dimensions
Tolerances 0.25 mm
Finish: Gold plate
PIN 1
1.52
30
26.040.08
20.83
14 PINS x 0.50.08
8.9
12.7
12.7
MIN
2.79
ON 2.54 PITCH
17.8
10.5
5
9.39
4.12
4 HOLES 2.6
36 MAX
NOSE CONE BOOT
HYTREL SECONDARY COATED
DIMENSIONS IN MILLIMETRES
TOLERANCES UNLESS
OTHERWISE SPECIFIED:
X.XX = 0.25
X.XXX = 0.127
MAX
5.46
Figure 3: Dimensions diagram
Environmental Conditions
Parameter Min
Nom
Max
Unit
Operating Air Temperature
-40
70
C
Operating Case Temperature
-40
70
C
Typical Environment
0
60
C
Instructions for Use
Pin 1 and Pin 2 Thermistor
The thermistor is used in a control loop in conjunction
with the thermo-electric cooler to maintain the laser
submount temperature at the required value. Operating
current should be less than 100 A to prevent self-
heating errors.
Pin 3 Laser modulation (-) and bias
The data input (modulation) and bias are both applied
via this pin which has a nominal 25 Ohm load
impedance.
Pin 4 Monitor anode, Pin 5 Monitor cathode
The back facet monitor diode provides a mean power
reference for the laser and is normally operated with
a 5 V reverse bias.
Pin 6 TEC (+), Pin 7 TEC (-)
Applying a positive voltage on pin 6 with respect to pin 7
will cause the internal submount to be cooled relative to
the case temperature.
Reversing the polarity will raise the submount temperature
relative to the case. Care should be taken to avoid
overheating the submount when driving the TEC in
this manner.
The TEC supply should be capable of delivering up to
1.2 A at 2.5 V.
Pin 8, 9, 11, 13 Case ground.
These pins must be grounded in all applications.
Pin 10, 14 N/C
These pins are not connected. They should be grounded
if possible.
Pin 12 Laser (+)
This pin provides the return path for the laser modulation
and bias circuits.
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REFERENCE IEC 60825-1: Edition 1.2
INVISIBLE LASER
RADIATION DO NOT VIEW
DIRECTLY WITH OPTICAL
INSTRUMENTS
CLASS 1M LASER PRODUCT
DANGER
INVISIBLE LASER RADIATION - AVOID
DIRECT EXPOSURE TO BEAM
Class IIIb Laser Product
THIS PRODUCT COMPLIES WITH 21CFR 1040.10
OUTPUT POWER
WAVELENGTH
21 mW
>1500 nm
CAUTION
STATIC SENSITIVE DEVICE
OBSERVE PRECAUTIONS
Ordering Information
Please quote the Product Code from below when ordering as this is the identification
that appears on the part when shipped.
Product Code
Fibertail
Product Name
Length
Diameter
Fibre type
LC151B-20C28 116 cm 30 mm
0.9 mm
standard
4/155 Mb/s Single-Mode
OSC Laser, 1510 nm
with SC/PC connector
LC151B-20C34 116 cm 30 mm
0.9 mm
standard
4/155 Mb/s Single-Mode
OSC Laser, 1510 nm
with FC/PC connector
LC151B-20C57 116 cm 30 mm
0.9 mm
standard
4/155 Mb/s Single-Mode
OSC Laser, 1510 nm
with LC/PC connector
LC151B-20C59 116 cm 30 mm
0.9 mm
standard
4/155 Mb/s Single-Mode
OSC Laser, 1510 nm
with MU/PC connector
Certificate No. FM 15040
Certificate No. EMS 35100
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REV 1 Feb 2003
Bookham Technology 2003 Bookham & ASOC are registered trademarks of Bookham Technology plc
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GA 30024
USA
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Fax: +1 678 482 4022
Europe
Bookham Technology plc
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Devon
TQ4 7BE
UK
Tel: +44 (0) 1803 66 2875
Fax: +44 (0) 1803 66 2801
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Tel: +852 (2100) 2249
Fax: +852 (2100) 2585
Sales@bookham.com
Important Notice
Bookham Technology has a policy of
continuous improvement, as a result
certain parameters detailed on this flyer
may be subject to change without notice.
If you are interested in a particular product
please request the available from any
Bookham Technology sales representative.
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