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 70°C, or over two adjacent 100 GHZ channels with a case temperature of 85°C 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 1 Data Sheet Parameters Parameter Conditions Min Threshold current (Ith) Slope efficiency RF input reflection coef (S11) 2 mW 3 mW 4 mW High Power [1] Unit 10 22 mA 0.09 0.13 0.17 0.43 mW/mA mW/mA mW/mA mW/mA -10 dB 1.8 V 1563 nm 2 dB 0.6 nm [2] 1.3 Peak wavelength (λp) [3] Dispersion penalty [4] 1527 -20 dB Side-mode suppression Optical rise/fall time Max 0.04 0.06 0.08 0.143 Forward voltage Time averaged spectral linewidth Typ 0.4 34 40 [5] Monitor photo current 50 250 Monitor dark current Thermistor resistance Heatpump current Heatpump voltage Change of λ with laser temp. Change of λ over life and operating conditions ∆T = 64°C 4.07 ∆T = 64°C 8 to 50°C [6] dB 125 ps 1200 µA 100 nA 20.7 kΩ 1000 mA 2.4 V 0.09 -45 nm/°C +145 pm [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 Ω measurement system, f = dc - 3 GHz. [3] Submount temperature between 8°C & 50°C start of life to achieve required λp. [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(λ ) = So λ (λ − ) ps /(nm.km) 4 λ where So =0.092 ps/(nm2 km) and λ0 = 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. 2 Data Sheet Absolute Maximum Ratings Parameter Min Max Unit Case operating temperature (with 2 x 100 GHz tuning) -20 85 °C Case operating temperature (with 4 x 100 GHz tuning) -20 70 °C 8 50 °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 Heat Pump Current 1 A Heatpump voltage 2.4 V Laser submount operating temperature Storage temperature Fibre bend radius 30 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 8°C to 50°C 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. 3 Data Sheet Figure 2: Schematic Diagram. Connections Pin # Function Pin # Function 1 Thermistor 8 Case ground 2 Thermistor 9 Case ground 3 Laser DC bias (-) 10 N/C 4 Monitor anode (-) 11 Laser case ground 5 Monitor cathode (+) 12 Laser modulation (-) 6 TEC (+) 13 Laser case ground 7 TEC (-) 14 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 µA 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. 4 Pin 14 N/C This pin is not connected. It should be grounded if possible. Data Sheet Ordering Information LC25T [Wavelength] [Power Option] [Reach] [Connector] **** E = 2 mWpk C = 3 mWpk A = 4 mWpk B = High power A = 175 km B = 360 km - 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. -20°C to 85°C Case Temperature, 2 x 100 GHz Tunable Operation Where a maximum case temperature of +85°C is required, the LC25T can be tuned over 2 adjacent 100 GHz channels. With the elevated case temperature, the submount temperature tuning range becomes 25°C to 50°C. Revised Parameters for 85°C Case Temperature Operation Parameter 5 Conditions Min Typ Max Unit Thermistor resistance 4.07 10 kΩ Case operating temperature -20 85 °C Laser submount operating temperature 25 50 °C Data Sheet Ordering Information (continued) To order the 85°C case temperature compliant device, the wavelength 2 channels below the required wavelength must be selected. See table below. Lower channel 6 Upper channel Wavelength (nm) ITU Channel No. Wavelength (nm) ITU Channel No. Wavelength Code to Order 1527.22 63 1527.99 62 2566 1527.99 62 1528.77 61 2644 1528.77 61 1529.55 60 2722 1529.55 60 1530.33 59 2799 1530.33 59 1531.12 58 2877 1531.12 58 1531.90 57 2955 1531.90 57 1532.68 56 3033 1532.68 56 1533.47 55 3112 1533.47 55 1534.25 54 3190 1534.25 54 1535.04 53 3268 1535.04 53 1535.82 52 3347 1535.82 52 1536.61 51 3425 1536.61 51 1537.40 50 3504 1537.40 50 1538.19 49 3582 1538.19 49 1538.98 48 3661 1538.98 48 1539.77 47 3740 1539.77 47 1540.56 46 3819 1540.56 46 1541.35 45 3898 1541.35 45 1542.14 44 3977 1542.14 44 1542.94 43 4056 1542.94 43 1543.73 42 4135 1543.73 42 1544.53 41 4214 1544.53 41 1545.32 40 4294 1545.32 40 1546.12 39 4373 1546.12 39 1546.92 38 4453 1546.92 38 1547.72 37 4532 1547.72 37 1548.51 36 4612 1548.51 36 1549.32 35 4692 1549.32 35 1550.12 34 4772 1550.12 34 1550.92 33 4851 Data Sheet Ordering Information (continued) Lower channel Upper channel Wavelength (nm) ITU Channel No. Wavelength (nm) ITU Channel No. Wavelength Code to Order 1550.92 33 1551.72 32 4932 1551.72 32 1552.52 31 5012 1552.52 31 1553.33 30 5092 1553.33 30 1554.13 29 5172 1554.13 29 1554.94 28 5252 1554.94 28 1555.75 27 5333 1555.75 27 1556.56 26 5413 1556.56 26 1557.36 25 5494 1557.36 25 1558.17 24 5575 1558.17 24 1558.98 23 5655 1558.98 23 1559.79 22 5736 1559.79 22 1560.61 21 5817 1560.61 21 1561.42 20 5898 1561.42 20 1562.23 19 5979 1562.23 19 1563.05 18 6061 1563.05 18 1563.86 17 6142 E.g. LC25T5252BB-J28 will operate at an 85°C maximum case temperature with a lower channel wavelength of 1554.13 nm and can be tuned up one channel to 1554.94 nm. 7 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 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 8 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. BH13089 Rev 1.0 January 2007. ©Bookham 2006. Bookham is a registered trademark of Bookham Inc.