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Data Sheet
2.5 Gb/s Buried Het 4x100GHz Tunable Laser with extended reach option LC25T
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 monitor photodiode for control of the power of the laser over life and all operating conditions. The module is tunable by means of the internal thermo-electric cooler over four adjacent 100 GHz ITU WDM channels with a case temperature of 70C, or over two adjacent 100 GHZ channels with a case temperature of 85C The device is available with a number of power options and wavelength schemes, which are customizable to individual customer specification. Features: * 2.5 Gb/s Operation * Tunable over four separate channels at 100 GHz channel spacing * +/-95pm wavelength stability over life * 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 * RoHS compliant
Applications: * Cost effective metropolitan or long haul networks * Stock inventory / Spares reduction * Network protection * Low-speed routing / Networks reconfiguration
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Data Sheet
Parameters
Parameter Threshold current (Ith) Slope efficiency 2 mW 3 mW 4 mW High Power [1] [2] 1.3 [3] [4] -20 dB 34 [5] 50 250 0.4 40 125 1200 100 T = 64C 8 to 50C [6] -45 4.07 20.7 1000 2.4 0.09 +145 1527 0.04 0.06 0.08 0.143 Conditions Min Typ 10 Max 22 0.09 0.13 0.17 0.43 -10 1.8 1563 2 0.6 Unit mA mW/mA mW/mA mW/mA mW/mA dB V nm dB nm dB ps A nA k mA V nm/C pm
RF input reflection coef (S11) Forward voltage Peak wavelength (p) Dispersion penalty Time averaged spectral linewidth Side-mode suppression Optical rise/fall time Monitor photo current Monitor dark current Thermistor resistance Heatpump current Heatpump voltage Change of with laser temp.
T = 64C
Change of over life and operating conditions
[1] The high power version provides 10 mW peak output power for 175 km applications and 7 mW peak ouput power for 360 km applications. [2] 50 measurement system, f = dc - 3 GHz. [3] Submount temperature between 8C & 50C 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. To give symmetrical wavelength performance about the ITU channel wavelength (+/-95pm) offset the laser wavelength by -50pm at start of life set up.
So ( - ) ps /(nm.km) 4
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Data Sheet
Absolute Maximum Ratings
Parameter Case operating temperature (with 2 x 100 GHz tuning) Case operating temperature (with 4 x 100 GHz tuning) Laser submount operating temperature Storage temperature Laser current above Ith Laser reverse voltage Laser reverse current Monitor diode bias Heat Pump Current Heatpump voltage Fibre bend radius 30 Min -20 -20 8 -40 Max 85 70 50 85 100 1.0 10 -10 1 2.4 Unit C 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 and Pinout Information.
Note: Device can be supplied with the leads trimmed to a length of 3.81 mm typ.
Please see Order Information section.
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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 anode (-) Monitor cathode (+) TEC (+) TEC (-) Pin # 8 9 10 11 12 13 14 Function Case ground Case ground N/C Laser case ground Laser modulation (-) Laser case ground N/C
Instructions for use - LC25T
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 Monitor anode, Pin 5 Monitor cathode The back facet monitor 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. The TEC supply should be capable of delivering up to 0.9 A at 2.4 V. Pin 8, 9, 11, 13 Case ground These pins must be grounded in all applications. Pin 10 This pin is not connected for the LC25T product and it should be grounded if possible. 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.
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Pin 14 N/C This pin is not connected. It should be grounded if possible.
Data Sheet
Ordering Information
LC25T [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. LC25T4532CA-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. LC25T4532BA-J28 is a 10 mW 1545.32 to 1547.72 nm device with an SC connector for use in a 175 km application. E.g. LC25T4532BB-J28 is a 7 mW 1545.32 to 1547.72 nm device with an SC connector for use in a 360 km application.
Trimmed lead 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. LC25T4532BBK-J28 is a 7 mW 1545.32 nm device with an SC connector and a lead length of 3.81mm, for use in a 360 km application.
-20C to 85C Case Temperature, 2 x 100 GHz Tunable Operation Where a maximum case temperature of +85C is required, the LC25T can be tuned over 2 adjacent 100 GHz channels. With the elevated case temperature, the submount temperature tuning range becomes 25C to 50C.
Revised Parameters for 85C Case Temperature Operation
Parameter Thermistor resistance Case operating temperature Laser submount operating temperature Conditions Min 4.07 -20 25 Typ Max 10 85 50 Unit k C C
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Data Sheet
Ordering Information (continued)
To order the 85C case temperature compliant device, the wavelength 2 channels below the required wavelength must be selected. See table below. Lower channel Wavelength (nm) 1527.22 1527.99 1528.77 1529.55 1530.33 1531.12 1531.90 1532.68 1533.47 1534.25 1535.04 1535.82 1536.61 1537.40 1538.19 1538.98 1539.77 1540.56 1541.35 1542.14 1542.94 1543.73 1544.53 1545.32 1546.12 1546.92 1547.72 1548.51 1549.32 1550.12 ITU Channel No. 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 Wavelength (nm) 1527.99 1528.77 1529.55 1530.33 1531.12 1531.90 1532.68 1533.47 1534.25 1535.04 1535.82 1536.61 1537.40 1538.19 1538.98 1539.77 1540.56 1541.35 1542.14 1542.94 1543.73 1544.53 1545.32 1546.12 1546.92 1547.72 1548.51 1549.32 1550.12 1550.92 Upper channel ITU Channel No. 62 61 60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 Wavelength Code to Order 2566 2644 2722 2799 2877 2955 3033 3112 3190 3268 3347 3425 3504 3582 3661 3740 3819 3898 3977 4056 4135 4214 4294 4373 4453 4532 4612 4692 4772 4851
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Data Sheet
Ordering Information (continued)
Lower channel Wavelength (nm) 1550.92 1551.72 1552.52 1553.33 1554.13 1554.94 1555.75 1556.56 1557.36 1558.17 1558.98 1559.79 1560.61 1561.42 1562.23 1563.05 ITU Channel No. 33 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 Wavelength (nm) 1551.72 1552.52 1553.33 1554.13 1554.94 1555.75 1556.56 1557.36 1558.17 1558.98 1559.79 1560.61 1561.42 1562.23 1563.05 1563.86 Upper channel ITU Channel No. 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 Wavelength Code to Order 4932 5012 5092 5172 5252 5333 5413 5494 5575 5655 5736 5817 5898 5979 6061 6142
E.g. LC25T5252BB-J28 will operate at an 85C maximum case temperature with a lower channel wavelength of 1554.13 nm and can be tuned up one channel to 1554.94 nm.
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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.
BH13089 Rev 1.0 January 2007. (c)Bookham 2006. Bookham is a registered trademark of Bookham Inc.

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