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D2517G Datasheet(PDF) 2 Page - Agere Systems |
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D2517G Datasheet(HTML) 2 Page - Agere Systems |
2 / 8 page 2 2 Lucent Technologies Inc. Data Sheet February 2000 Isolated DFB Laser Module 1.5 µm D2500-Type Digital Description The D2500-Type Digital Isolated DFB Laser Module contains an internally cooled, InGaAsP, MQW, distrib- uted-feedback (DFB) laser designed for 1.5 µm appli- cations. The laser is designed to be used in OC-12/ STM-4 (622 Mbits/s) and OC-48/STM-16 (2.488 Gbits/ s) for long-reach and extended-reach applications. It is also capable of low dispersion penalties (<2 dB) for use with fiber spans exceeding 170 km (3000 ps/nm). The device is available with an average output power of 0 dBm (3 dBm peak), which meets the SONET/SDH standard. To eliminate the need for optical amplifiers in some applications, the module can also be ordered with higher output powers. 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. 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 ther- mistor, which can be used with external circuitry to con- trol 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 con- junction with control circuitry, can control optical power launched into the fiber. Normally, this configuration is used in a feedback arrangement to maintain the aver- age laser output power. Standard Package The laser module is fabricated in a 14-pin, hermetic, metal/ceramic butterfly package. The package also incorporates a bias tee that separates the dc-bias path from the RF input. The RF input has a nominal 25 Ω impedance. The laser module is equipped with a sin- gle-mode fiber with an 8 µm core and 125 µm cladding. The minimum pigtail length is 39.4 in. (100 cm); the minimum bend radius is 1.18 in. (30 mm). The pigtail is a 900 µm tight buffer fiber. Various con- nector and pigtail options are available. Lucent Technologies Microelectronics Group optoelec- tric components are qualified to rigorous internal stan- dards that are consistent with Telcordia Technologies TR-NWT-000468. All design and manufacturing opera- tions are ISO * 9001 certified. The module is fully quali- fied for central office applications. * ISO is a registered trademark of The International Organization for Standardization. Pin Information * A positive current through the thermoelectric heat pump cools the laser. † Both leads should be grounded for optimum performance. Top view. Figure 1. Circuit Schematic Pin Name 1 Thermistor 2 Thermistor 3 Laser dc Bias (cathode) (–) 4 Back-facet Monitor Anode (–) 5 Back-facet Monitor Cathode (+) 6 Thermoelectric Cooler (+)* 7 Thermoelectric Cooler (–)* 8 Case Ground 9 Case Ground 10 Case Ground 11 Laser Anode (+)† 12 RF Laser Input Cathode (–) 13 Laser Anode (+)† 14 Case Ground 1-567 TEC L1 160 nH ISOLATOR R1 20 Ω PACKAGE GROUNDS –+ + – – +– + 76 5 4 3 2 1 8 9 10 11 12 13 TH 10 k Ω 14 |
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