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D2587P9055 Datasheet(PDF) 2 Page - Agere Systems |
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D2587P9055 Datasheet(HTML) 2 Page - Agere Systems |
2 / 14 page Wavelength-Selected, High-Power D2587P-Type (with Wavelength Data Sheet, Rev. 2 Locker)/D2547P-Type Isolated DFB Laser Modules July 2001 2 2 Agere Systems Inc. Description (continued) Principles of Operation (Controlled Wave- length) The single-channel, wavelength-selected DFB (ILM) pack- age contains internal wavelength-discriminating optics, i.e., two etalons and associated photodiodes. The output con- sists of analog signals suitable for controlling the electrical current of the thermoelectric cooler (TEC) and the DFB laser. 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 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 –25 °C to +70 °C. The laser temperature is monitored by the internal thermistor, which can be used with external cir- cuitry 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 the Agere Systems Inc. lithium niobate modulators. It has a mode field diameter of 10.5 µm, a cladding diameter of 125 µm ±3 µm, and a loose tube jacketed fiber 900 µm in diameter. Figure 1 shows the orientation of polarization in the fiber. Agere Systems’ optoelectronic components are being qual- ified 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. † Telcordia Technologies is a trademark of Telcordia Technologies 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. Table 1. Pin Descriptions Pin D2587P-Type D2547P-Type 1 Thermistor Thermistor 2 Thermistor Thermistor 3 Laser dc Bias (Cathode) (–) Laser dc Bias (Cathode) (–) 4 Back-facet Monitor Anode (–) Back-facet Monitor Anode (–) 5 Back-facet Monitor Cathode (+) Back-facet Monitor Cathode (+) 6TEC (+)1 TEC (+)1 7TEC (–)1 TEC (–)1 8 Case Ground Case Ground 9 λ Photodiode 2 Anode Case Ground 10 λ Photodiode 1 Anode Case Ground 11 Laser Anode (+) 2 Laser Anode (+) 2 12 RF Laser Input Cathode (–) RF Laser Input Cathode (–) 13 Laser Anode (+) 2 Laser Anode (+) 2 14 NC Case Ground CORE STRESS ROD PRINCIPLE POLARIZATION AXIS CLADDING INNER COATING OUTER COATING (SILICON & ACRYLATE) 1-771(C).a |
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