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D2525P59 Dataheets PDF



Part Number D2525P59
Manufacturers Agere Systems
Logo Agere Systems
Description Wavelength-Selected D2525P Isolated DFB Laser Module with PMF
Datasheet D2525P59 DatasheetD2525P59 Datasheet (PDF)

Data Sheet March 2000 Wavelength-Selected D2525P Isolated DFB Laser Module with PMF Applications s Telecommunications — SONET/SDH OC-48/STM-16, OC-192/STM-64 — Extended and ultralong reach — Undersea systems — Dense WDM systems Digital video s Description The D2525P family of DFB laser modules is designed to be used with a lithium niobate external modulator (see Table 4). The laser module features a polarization-maintaining fiber (PMF) pigtail, enabling it to be directly connected to a modula.

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Data Sheet March 2000 Wavelength-Selected D2525P Isolated DFB Laser Module with PMF Applications s Telecommunications — SONET/SDH OC-48/STM-16, OC-192/STM-64 — Extended and ultralong reach — Undersea systems — Dense WDM systems Digital video s Description The D2525P family of DFB laser modules is designed to be used with a lithium niobate external modulator (see Table 4). The laser module features a polarization-maintaining fiber (PMF) pigtail, enabling it to be directly connected to a modulator without the need of a polarization controller. The PMF maintains the polarization of the output light to a consistent orientation. This allows the D2525P to be used as a CW light source for systems requiring extremely low chirp such as undersea or 10 Gbits/s systems. The module contains a multiquantum-well (MQW), distributedfeedback (DFB) laser. This device nominally has an output power of 10 mW. The wavelength of the laser can be temperature-tuned for more precise wavelength selection by adjusting the temperature of the internal thermoelectric cooler. The 1.5 µm D2525P Laser Module is available in a 14-pin, hermetic, butterfly package. Features s ITU wavelengths available from 1529.55 nm —1610.06 nm Integrated optical isolator High-performance, multiquantum-well (MQW), distributed-feedback (DFB) laser Industry-standard, 14-pin butterfly package Hermetic package InGaAs, PIN photodetector back-facet monitor Polarization-maintaining fiber pigtail For use with lithium niobate modulators High reliability Narrow linewidth High optical power available s s s s s s s s s s Wavelength-Selected D2525P Isolated DFB Laser Module with PMF Data Sheet March 2000 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. CORE STRESS ROD PRINCIPAL POLARIZATION AXIS CLADDING INNER COATING (SILICON & ACRYLATE) OUTER COATING (ACRYLATE OR NYLON) 1-771(C).a 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. Figure 1. Polarization-Maintaining Fiber Pin Information Table 1. Pin Descriptions Pin Name Thermistor Thermistor Laser dc Bias (Cathode) (–) Back-facet Monitor Anode (–) Back-facet Monitor Cathode (+) Thermoelectric Cooler (+)1 Thermoelectric Cooler (–)1 Case Ground Case Ground Case Ground Laser Anode (+) 2 RF Laser Input Cathode (–) Laser Anode (+) 2 Case Ground Controlled Power An internal, InGaAs, PIN photodiode functions as the backfacet 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. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Standard Package The laser module is fabricated in a 14-pin, hermetic, metal/ ceramic butterfly package that 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 Fujikura* polarizationmaintaining fiber (PMF). The fiber is PANDA type and is the same fiber that is used on Lucent Technologies Microelectronics Group’s lithium niobate modulators. It has a mode field diameter of 10.5 µm, a cladding diameter of 123 µm— 128 µm, and a loose tube jacketed fiber 900 µm in diameter. The pigtail is terminated with an ST ® ferrule†. Figure 1 shows the orientation of polarization in the fiber. Lucent’s 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. * Fujikura is a registered trademark of Fujikura Ltd. † The ST ferrule key is not aligned to slow axis of fiber. Connector is intended for testing purposes only. ‡ Telcordia Technologies is a trademark of Bell Communications Research, Inc. § ISO is a registered trademark of The International Organization for Standardization. 1. A positive current through the thermoelectric heat pump cools the laser. 2. Both leads should be grounded for optimum performance. 7 – 6 + 5 + 4 – L1 160 nH TEC 3 – TH 10 kΩ 2 1 PACKAGE GROUNDS + 8 9 10 11 R1 20 Ω – 12 ISOLATOR + 13 14 1-567 Top view. Figure 2. Circuit Schematic Lucent Technologies Inc. 2 Data Sheet March 2000 Wavelength-Selected D2525P Isolated DFB Laser Module with PMF Absolute Maximum Ratings Stresses in excess of the absolute maximum ratings can cause permanent damage to the device..


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