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D2525P58 Datasheet(PDF) 2 Page - Agere Systems |
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D2525P58 Datasheet(HTML) 2 Page - Agere Systems |
2 / 10 page Wavelength-Selected D2525P Data Sheet Isolated DFB Laser Module with PMF March 2000 2 2 Lucent Technologies Inc. Description (continued) Controlled Feedback The module contains an internal optical isolator that sup- presses optical feedback in laser-based, fiber-optic sys- tems. 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 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. 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* polarization- maintaining fiber (PMF). The fiber is PANDA type and is the same fiber that is used on Lucent Technologies Microelec- tronics 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 diame- ter. 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 Telcor- dia Technologies ‡ TR-NWT-000468. All design and manu- facturing 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. Figure 1. Polarization-Maintaining Fiber Pin Information 1. A positive current through the thermoelectric heat pump cools the laser. 2. Both leads should be grounded for optimum performance. Top view. Figure 2. Circuit Schematic Table 1. Pin Descriptions Pin Name 1 Thermistor 2 Thermistor 3 Laser dc Bias (Cathode) (–) 4 Back-facet Monitor Anode (–) 5 Back-facet Monitor Cathode (+) 6 Thermoelectric Cooler (+)1 7 Thermoelectric Cooler (–)1 8 Case Ground 9 Case Ground 10 Case Ground 11 Laser Anode (+) 2 12 RF Laser Input Cathode (–) 13 Laser Anode (+) 2 14 Case Ground 1-771(C).a CORE STRESS ROD PRINCIPAL POLARIZATION AXIS CLADDING INNER COATING (SILICON & ACRYLATE) OUTER COATING (ACRYLATE OR NYLON) 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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