BOOKHAM LC25EW4532EBJ59 2.5gb/s buried het laser 360km extended reach with optional etalon stabilization Datasheet

Data Sheet
2.5Gb/s Buried Het Laser 360km Extended Reach
With Optional Etalon Stabilization
LC25W-B (360km)
This laser module employs the Bookham strained layer
MQW Buried Heterostructure DFB laser chip, and has been
designed specifically for use in Wavelength Division
Multiplexed (WDM) 2.5Gb/s long distance optical fiber trunk
systems. The device is packaged in a hermetically sealed
14-pin butterfly package incorporating an isolator and monitor
photodiode for control of the power of the laser over life and
all operating conditions.
The device is available with a number of power options
depending on application and link span requirements.
The optional internal Etalon wavelength stabilization and low
chirp performance makes this product compliant with 50GHz
optical channel spacing.
Features:
• 2.5Gb/s operation
• +/-95pm wavelength stability over life without
Etalon locker
• Optional Etalon wavelength stabilization provides
50GHz optical channel spacing compliance for interlay
or future upgrade
• Narrow spectral line-width
• Internal TEC with precision NTC thermistor for
temperature control
• Entire C & L-band ITU avelengths available
(1527nm to 1605nm)
• Code reduction with single product for reaches
up to 360km
• GaInAsP SLMQW DFB single frequency laser chip
• InGaAs monitor photo-diode
• Hermetically sealed 14-pin butterfly package with
optical isolator
• RoHS compliant
Applications:
• WDM
• On-off ramps
• Long-Haul
• DWDM on ITU Grid
1
Data Sheet
Parameters
Conditions
Parameter
Min
Threshold current (Ith)
Slope efficiency by product
2
3
4
7
RF input reflection coef (S11)
mW
mW
mW
mW
Typ
Max
Unit
10
22
mA
0.04
0.06
0.08
0.143
0.09
0.13
0.17
0.43
[1]
Forward voltage
1.3
Peak wavelength (λp)
[2]
Dispersion penalty at 360 km
[3]
Time averaged spectral linewidth
1527
-20 dB
0.1
Side-mode suppression
32
Optical rise/fall time
Unlocked
Etalon locked
50
40
250
250
Monitor dark current
Thermistor resistance
dB
1.8
V
1605
nm
2
dB
0.6
nm
40
[4]
Monitor photo current
-10
dB
125
ps
1200
360
µA
100
nA
10
Heatpump current
70°C case temperature
Heatpump voltage
600
900
mA
70°C case temperature
1.0
2.4
V
15°C to 35°C
0.09
Change of λp with laser temp.
Change in λ over life and
operating conditions
Optical Spectral Window
Unlocked
[5]
Locked, over life & temperature
including chirp [5]
250
kΩ
nm/°C
-45
+145
pm
-9
+9
GHz
[1] 50 Ω measurement system, f = dc - 3GHz.
[2] Submount temperature between 20°C to 35°C start of life to achieve required λp. For the 10mW version, submount
temperature is between 15°C to 35°C start of life.
[3] Standard product dispersion penalty will be compliant to the specified link length of 360km using an extinction ratio of 10dB.
Fiber dispersion characteristics are derived from the following equation.
So
D ( )= ( 4
4
0
3
) ps /(nm.km)
Where So =0.092 ps/(nm2.km) and λ = 1302nm.
[4] Measurements determined from 20 - 80% pk - pk.
[5] For more information on wavelength control and drift over life refer to applications note DR1670. To give symmetrical
wavelength performance about the ITU channel wavelength (+/-95pm) offset the laser wavelength by –50pm at start of
life set up.
2
Data Sheet
Absolute Maximum Ratings
Parameter
Min
Max
Unit
0
70
°C
20
35
°C
-40
85
°C
Laser current above Ith
100
mA
Laser reverse voltage
1.0
V
Laser reverse current
10
µA
Monitor diode bias
-10
V
Heatpump voltage
2.4
V
Case operating temperature
Laser submount operating temperature
Storage temperature
Fiber bend radius
[1] [2]
30
mm
Notes:
[1] Product without locker can be tuned onto the next 100 GHz ITU channel in the red shift direction (2x100 GHz tunability) by increasing
the submount temperature to a maximum of 43°C.
[2] For the 10mW version, the minimum laser submount operating temperature is 15°C.
Reliability/Quality
Meets qualification requirements of Telcordia / Bellcore GR468-Core for central office environment.
Operating reliability <500 FITs1 in 15 years.
1- Assumes laser die submount held at <35°C by internal thermoelectric cooler, mean forward current of 35
mA, and end of life limits based on 10 mA increase in Ith and 25% change in laser efficiency. FIT rate data for
other end of life criteria, including minimum extinction ratio requirements, are available upon request.
Outline Drawing
Dimensions (mm)
Figure 1: Outline Drawing
Note:
3
Devices can be supplied with the leads trimmed to a length of 3.81mm. Please see Ordering Information section.
Fiber length: 1130mm to 1190mm.
Data Sheet
Instructions for use – LC25W****B/LC25EW****B
Pin 1 and Pin 2 Thermistor
Pin 6 TEC (+), Pin 7 TEC (-)
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 for wavelength.
Operating current should be less than 100µA to prevent
self-heating errors.
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. The TEC supply should be
capable of delivering up to 0.9A at 2.4V.
For Etalon stabilized devices the thermistor is used for the
initial set up of the submount temperature at the required
wavelength value. Operating current should be less than
100 µA to prevent self-heating errors. Once the initial
submount temperature has been achieved control of the TEC
current is handed over to the Etalon locking circuit to achieve
fine tuning.
Pin 8, 9, 11, 13 Case ground
Pin 3 Laser DC bias (-)
Laser bias current (negative with respect to package ground)
is applied via this pin which forms one side of the bias-T
connection to the laser cathode.
Pin 4 Monitor anodes, Pin 5 Common Monitor cathode
The back facet monitor provides a mean power reference for
the laser and is normally operated with a 5V reverse bias.
For Etalon stabilized devices the monitor diodes are arranged
in the package such that they give an equal monitor current
when the laser wavelength is matched to the ITU grid.
A reverse bias must be applied equally across each of the
monitors, this is commonly achieved by applying 5 V to Pin 5.
4
These pins must be grounded in all applications.
Pin 10
This pin is not connected for the LC25W product and it
should be grounded if possible. For the Etalon locked
product this pin is used for the monitor long anode.
The monitor diodes are arranged such that they give an equal
monitor current when the laser wavelength is matched to the
ITU grid. A reverse bias must be applied equally across each
of the monitors, this is commonly achieved by applying
5V to pin 5.
Pin 12 Laser modulation (-)
The data input (modulation current) is applied via this pin
which is a nominal 25 Ohm impedance coplanar line.
Pin 14 N/C
This pin is not connected. It should be grounded if possible.
Data Sheet
Connections
Without Etalon
Pin
Function
Pin
Function
1
Thermistor
1
Thermistor
2
Thermistor
2
Thermistor
3
Laser DC bias (-)
3
Laser DC bias (-)
4
Monitor Anode (-)
4
Monitor Short Anode (-)
5
Monitor Cathode (+)
5
Monitor Cathode (+)
6
TEC (+)
6
TEC (+)
7
TEC (-)
7
TEC (-)
8
Case Ground
8
Case Ground
9
Case Ground
9
Case Ground
10
Not Connected
10
Monitor Long Anode (-)
11
Case Ground
11
Case Ground
12
Laser Modulation (-)
12
Laser Modulation (-)
13
Case Ground
13
Case Ground
14
Not Connected
14
Not Connected
Safety Information
Laser safety classifications:
IEC 60825-1:Edition 1.2 Class 1M
21 CFR Ch.1 (4-1-97 Edition) Class IIIb
Electrostatic discharge:
ESD threshold >500V
TA-TSY-000870 class 3.
5
With Etalon
Data Sheet
RoHS Compliance
Bookham is fully committed to environment
protection and sustainable development and has
set in place a comprehensive program for
removing polluting and hazardous substances from
all of its products. The relevant evidence of RoHS
compliance is held as part of our controlled
documentation for each of our compliant products.
RoHS compliance parts are available to order,
please refer to the ordering information section for
further details.
Ordering Information:
LC25
[Etalon Option]
[Wavelength]
[Power Option]
[Reach]
[Connector]
W = none
EW = Etalon
****
E = 2 mWpk
C = 3 mWpk
A = 4 mWpk
B = 7 mWpk
B = 360km -
J28 = SC/PC
J34 = FC/PC
J57 = LC
J59 = MU
**** = Last four digits of wavelength value E.g. for lp = 1545.32nm **** = 4532
Product without locker can be tuned onto the next 100GHz ITU channel in the red shift direction (2x100GHz
tunability) i.e. an LC25W4135CB-J28 can be tuned to service the 1542.14nm ITU channel.
Other connector types are available on request.
E.g. LC25W4532BB-J28 is a 7mW 1545.32 nm device with an SC connector for use in a 360km application.
E.g. LC25EW4532EB-J28 is a 2mW 1545.32 nm device with an SC connector for use in a 360km application
with optional Etalon stabilization.
Trimmed lead option
Devices can be supplied with the leads trimmed to a length of 3.81mm typ.
This option can be specified by adding a ‘K’ suffix after the reach option.
E.g. LC25W4532BAK-J28 is a 10mW 1545.32nm device with an SC connector and a lead length of 3.81mm
typical, for use in a 175km application.
Contact Information
North America
Bookham Worldwide
Headquarters
Europe
Paignton Office
Asia
Shenzhen Office
2584 Junction Ave.
San Jose
CA 95134
USA
Brixham Road
Paignton
Devon
TQ4 7BE
United Kingdom
2 Phoenix Road
Futian Free Trade Zone
Shenzhen 518038
China
• Tel: +1 408 919 1500
• Tel: +44 (0) 1803 66 2000
• Fax: +1 408 919 6083
• Fax: +44 (0) 1803 66 2801
• Fax: +86 755 33305805
+86 755 33305807
• Tel: +86 755 33305888
Important Notice
Performance figures, data and any illustrative material
provided in this data sheet are typical and must be
specifically confirmed in writing by Bookham before
they become applicable to any particular order or
contract. In accordance with the Bookham policy of
continuous improvement specifications may change
without notice. The publication of information in this
data sheet does not imply freedom from patent or other
protective rights of Bookham or others. Further details
are available from any Bookham sales representative.
www.bookham.com
[email protected]
DANGER
INVISIBLE LASER RADIATION
DO NOT VIEW DIRECTLY WITH
OPTICAL INSTRUMENTS
CLASS 1M LASER
REFERENCE IEC 60825-1: Edition 1.2
6
INVISIBLE LASER RADIATION
AVOID DIRECT
EXPOSURE TO BEAM
OUTPUT POWER 21mW
WAVELENGTH >1510nm
CLASS IIIb LASER PRODUCT
THIS PRODUCT COMPLIES
WITH 21 CFR 1040.10
ISO14001:1996
EMS 504193
TL9000 Rev 3.0 (ISO9001:2000)
FM15040
Caution - use of controls or
adjustments or performance
of procedures other than those
specified herein may result in
hazardous radiation exposure.
BH13087 Rev 1.0 January 2007.
©Bookham 2006. Bookham is a registered trademark of Bookham Inc.
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