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Data Sheet
2.5 Gb/s Buried Het 4x100GHz Tunable Laser with Etalon Stabilisation and extended reach option LC25ET
This laser module employs the Bookham gain coupled SLMQW buried heterostructure DFB laser chip, and has been designed specifically for use in Wavelength Division Multiplexed (WDM) 2.5 Gb/s long distance optical fibre trunk systems. The device is packaged in a hermetically sealed 14-pin butterfly package incorporating an isolator and locking optics to lock and stabilise wavelength and power of the laser over life. The module is tunable by means of the internal thermo-electric cooler over four adjacent 100 GHz ITU WDM channels. The device is available with a number of power options and wavelength schemes, which are customizable to individual customer specification. The internal etalon wavelength stablilisation and low chirp performance makes this product compliant with 50GHz optical channel spacing. Features: * 2.5 Gb/s Operation * Tunable over four separate channels at 100 GHz channel spacing * Integrated wavelength locking optics * Entire C band ITU wavelengths available (1528 to 1563 nm) * Narrow spectral line-width * Hermetically sealed 14-pin butterfly package with optical isolator * Internal TEC with precision NTC thermistor * Extended reach performance up to 360 km with low dispersion penalty * 50GHz optical channel spacing compliant for interlay or future upgrade * RoHS compliant
Applications: * Optical Service Channel (OSC) applications in DWDM transmission systems using optical amplifiers.
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Data Sheet
Parameters
Parameter Threshold current (Ith) Slope efficiency 2 mW 3 mW 4 mW High Power
[2]
Conditions
Min
Typ 10
Max 22 0.09 0.13 0.17 0.43 -10
Unit mA mW/mA mW/mA mW/mA mW/mA dB V nm dB nm dB
[1]
0.04 0.06 0.08 0.143
RF input reflection coef (S11) Forward voltage Peak wavelength (p) Dispersion penalty Time averaged spectral line width Side-mode suppression Optical rise/fall time Monitor photo currents Monitor dark current Thermistor resistance Heatpump current Heatpump voltage Change of with laser temp. Optical spectral window
1.3
[3] [4]
1.8 1563 2
1527
-20 dB 34
[5]
0.4 40
0.6
125 40 250 360 50
ps A nA k mA V nm/C
T = 64C 8 to 50C
4.07
20.7 1000 2.4 0.09
T = 64C Over life & temperature including chirp [6] -9
+9
GHz
[1] The high power version provides 10 mW peak output power for 175 km applications and 7 mW peak output power for 360 km applications. [2] 50 measurement system, f = dc - 3 GHz. [3] Submount temperature between 0C & 40C start of life to achieve required p. [4] Dispersion penalty is compliant to a link length of 175 km or 360 km using an extinction ratio of 10dB. Fibre dispersion characteristics are derived from the following equation: 4 0 3
D( ) =
where So =0.092 ps/(nm2 km) and 0 = 1302 nm. [5] Measurements determined from 20 - 80% Pk - Pk. [6] For more information on wavelength control and drift over life refer to application note DR1670.
So ( - ) ps /(nm.km) 4
2
Data Sheet
Absolute Maximum Ratings
Parameter Case operating temperature Laser submount operating temperature Storage temperature Laser current above Ith Laser reverse voltage Laser reverse current Monitor diode bias Heat pump current Heat pump voltage Fibre bend radius 30 Min 0 8 -40 Max 70 50 85 100 1.0 10 -10 1 2.4 Unit C C C mA V A V A V mm
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 is held within the range 8C to 50C by the internal thermoelectric cooler and the product is deployed in equal quantities on each of the four channels with a mean forward current of 35 mA. 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 on request.
Outline Drawing
Figure 1: Outline Drawing.
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Data Sheet
Figure 2: Schematic Diagram.
Connections
Pin # 1 2 3 4 5 6 7 Function Thermistor Thermistor Laser DC bias (-) Monitor short anode (-) Monitor cathode (+) TEC (+) TEC (-) Pin # 8 9 10 11 12 13 14 Function Case ground Case ground Monitor long anode (-) Laser case ground Laser modulation (-) Laser case ground N/C
Instructions for use - LC25ET
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 for wavelength. Operating current should be less than 100 A to prevent self-heating errors. 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 +10 Monitor anodes, Pin 5 Monitor cathode 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 10 V to Pin 5. 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. The TEC supply should be capable of delivering up to 1.0 A at 2.4 V. Pin 8, 9, 11, 13 Case ground These pins must be grounded in all applications. Pin 12 Laser modulation (-) The data input (modulation current) is applied via this pin which is a nominal 25 Ohm impedance coplanar line. For 10mW applications the end of life modulation current is 90mA maximum. For all other applications 60mA maximum modulation current should be provisioned. Pin 14 N/C
4
This pin is not connected. It should be grounded if possible.
Data Sheet
Ordering Information
LC25ET [Wavelength] **** [Power Option] E = 2 mWpk C = 3 mWpk A = 4 mWpk B = High power [Reach] A = 175 km B = 360 km [Connector] J28 = SC/PC J34 = FC/PC J57 = LC J59 = MU
Fibre Length 1130 to 1190 mm. Other connector types are available on request. **** = Last four digits of first channel / shortest wavelength E.g. LC25ET4532CA-J28 has the following four channels: 1545.32 1546.12 1546.92 1547.72 nm nm nm nm
The high power option provides 10 mW peak power at 175 km or 7 mW peak power over 360 km. E.g. LC25ET4532BA-J28 is a 10 mW 1545.32 nm device with an SC connector for use in a 175 km application. E.g. LC25ET4532BB-J28 is a 7 mW 1545.32 nm device with an SC connector for use in a 360 km application.
Lead trimming option Devices can be supplied with the leads trimmed to a length of 3.81 mm typ. This option can be specified by adding a `K' suffix after the reach option. E.g. LC25ET4532BAK-J28 is a 10 mW 1545.32 nm device with an SC connector and a lead length of 3.81mm typical, for use in a 175 km application.
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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.
Contact Information
North America Bookham Worldwide Headquarters
2584 Junction Ave. San Jose CA 95134 USA * Tel: +1 408 919 1500 * Fax: +1 408 919 6083
Europe Paignton Office
Brixham Road Paignton Devon TQ4 7BE United Kingdom * Tel: +44 (0) 1803 66 2000 * Fax: +44 (0) 1803 66 2801
Asia Shenzhen Office
2 Phoenix Road Futian Free Trade Zone Shenzhen 518038 China * Tel: +86 755 33305888 * Fax: +86 755 33305805 +86 755 33305807
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 sales@bookham.com
DANGER
INVISIBLE LASER RADIATION DO NOT VIEW DIRECTLY WITH OPTICAL INSTRUMENTS CLASS 1M LASER
REFERENCE IEC 60825-1: Edition 1.2
INVISIBLE LASER RADIATION AVOID DIRECT EXPOSURE TO BEAM OUTPUT POWER 21mW WAVELENGTH >1510nm CLASS IIIb LASER PRODUCT
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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.
BH13170 Rev 1.0 January 2007. (c)Bookham 2006. Bookham is a registered trademark of Bookham Inc.

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