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D2526G889 Dataheets PDF



Part Number D2526G889
Manufacturers Agere Systems
Logo Agere Systems
Description D2570/ D2526/ D2555 Wavelength-Selected Direct Modulated Isolated DFB Laser Module
Datasheet D2526G889 DatasheetD2526G889 Datasheet (PDF)

Data Sheet, Rev. 3 July 2001 D2570, D2526, D2555 Wavelength-Selected Direct Modulated Isolated DFB Laser Module Applications s Three direct-modulated DWDM families available to meet a number of OC-48/STM-16 applications: — Extended reach (100 km) — Very long reach (170 km) — Metro DWDM — Digital video Product Codes Product Code The 1.5 µm D2570, D2526G, and D2555 Laser Modules are available in a 14-pin, hermetic, butterfly package. Peak Power 10 mW 2 mW 2 mW Dispersion Performance 1800 ps/n.

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Data Sheet, Rev. 3 July 2001 D2570, D2526, D2555 Wavelength-Selected Direct Modulated Isolated DFB Laser Module Applications s Three direct-modulated DWDM families available to meet a number of OC-48/STM-16 applications: — Extended reach (100 km) — Very long reach (170 km) — Metro DWDM — Digital video Product Codes Product Code The 1.5 µm D2570, D2526G, and D2555 Laser Modules are available in a 14-pin, hermetic, butterfly package. Peak Power 10 mW 2 mW 2 mW Dispersion Performance 1800 ps/nm (100 km) 1800 ps/nm (100 km) 3000 ps/nm (170 km) D2570H D2526G D2555G Features s ITU wavelengths available from 1528.77 nm —1610.06 nm SONET/SDH compatible up to OC-48/STM-16 Temperature tunable for precise wavelength selection Integrated optical isolator High-performance, multiquantum well (MQW) distributed-feedback (DFB) laser Industry-standard, 14-pin butterfly package Characterized at 2.488 Gbits/s (NRZ) InGaAs, PIN photodetector back-facet monitor Low threshold current High-reliability, hermetic packaging Excellent long-term wavelength stability can eliminate the need for external wavelength locker Qualified to meet the intent of Telcordia Technologies * 468 Description The Direct Modulated Isolated DFB Laser Module contains an internally cooled, InGaAs, MQW, distributed-feedback (DFB) laser designed for 1.5 µm applications. The following three direct-modulation DWDM product families have been established to meet various OC-48/STM-16 system applications: s s s s s s s s s s s D2526-type: designed to be used in OC-48/ STM-16 (2.488 Gbits/s) for extended reach, dense WDM applications (1800 ps/nm). The wavelength of the laser can be temperature-tuned for precise wavelength selection by adjusting the temperature of the internal thermoelectric cooler. D2555-type: high-performance device designed for very low dispersion; used in fiber spans exceeding 170 km (3000 ps/nm). D2570-type: high-power, direct-modulated laser eliminates the need for optical amplifiers in DWDM many applications. s s s * Telcordia Technologies is a trademark of Telcordia Technologies, Inc. D2570, D2526G, D2555 Wavelength-Selected Direct Modulated Isolated DFB Laser Module Data Sheet, Rev. 3 July 2001 Description (continued) Controlled Feedback The module contains an internal optical isolator that suppresses optical feedback in laser-based, fiber-optic systems. Light reflected back to the laser is attenuated a minimum of 30 dB. Pin Information Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Name Thermistor Thermistor Laser dc Bias (Cathode) (–) Back-facet Monitor Anode (–) Back-facet Monitor Cathode (+) Thermoelectric Cooler (+)* Thermoelectric Cooler (–)† Case Ground Case Ground Case Ground Laser Anode (+)† RF Laser Input Cathode (–) Laser Anode (+)† Case Ground Controlled Temperature An integral thermoelectric cooler (TEC) provides stable thermal characteristics. The TEC allows for heating and cooling of the laser chip to maintain a temperature of 25 °C for case temperatures from –40 °C to +70 °C. The laser temperature is monitored by the internal thermistor, which can be used with external circuitry to control the laser chip temperature. Controlled Power An internal, InGaAs, PIN photodiode functions as the back-facet monitor. The photodiode monitors emission from the rear facet of the laser and, when used in conjunction with control circuitry, can control optical power launched into the fiber. Normally, this configuration is used in a feedback arrangement to maintain consistent laser output power. * A positive current through the thermoelectric heat pump cools the laser. † Both leads should be grounded for optimum performance. 7 – 6 + 5 + 4 – L1 160 nH 3 – 2 1 TH 10 kΩ TEC Standard Package The laser module is fabricated in a 14-pin, hermetic, metal/ceramic butterfly package that incorporates a bias tee, which separates the dc-bias path from the RF input. The RF input has a nominal 25 Ω impedance. The laser module is equipped with SMF-28 * type fiber. The fiber has a 900 µm tight buffer jacket. Various connectors and pigtail lengths are available. Agere Systems’ optoelectronic components are being qualified to rigorous internal standards that are consistent with Telcordia Technologies TR-NWT-000468. All design and manufacturing operations are ISO * 9001 certified. The module is being fully qualified for central office applications. 8 PACKAGE GROUNDS + 9 10 11 R1 20 Ω – 12 ISOLATOR NC + 13 14 1-567F.b Top view. Figure 1. Circuit Schematic * ISO is a registered trademark of The International Organization for Standardization. † SMF-28 is a trademark of Corning Inc. 2 Agere Systems Inc. Data Sheet, Rev. 3 July 2001 D2570, D2526G, D2555 Wavelength-Selected Direct Modulated Isolated DFB Laser Module Absolute Maximum Ratings Stresses in excess of the absolute maximum ratings can cause permanent damage to the device. These are absolute stress ratings only. Functional operation of the device is not implied at these or a.


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