Document
Data Sheet, Rev. 3 July 2001
D2570, D2526, D2555 Wavelength-Selected Direct Modulated Isolated DFB Laser Module
Applications
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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
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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:
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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.
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* 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 .