a e re 8 AdLib OCR Evaluation systems Data Sheet June 2002 Wavelength-Selected High-Power D2587P-Type (with Wavelength Locker)/D2547P-Type Isolated DFB Laser Modules Applications 6116 o'14~ . Telecommunications: - Dense WDM - SONET/SDH OCA92/STM-64 - Extended and ultralong reach - Undersea systems . Digital video Description Featuring wavelength selection and locking capabilities, the D2587P Laser Module is ideally suited for use with external lithium niobate modulators, and in high-power (20 mW) applications . Features . High-performance, multiquantum-well (MQW), distributed-feedback (DFB) laser . D2587P-Type is offered on 50 GHz ITU grid wavelengths ranging from 1528.77 nm1610.06 nm . D2547P-Type is offered on 100 GHz ITU grid wavelengths ranging from 1528.77 nm1610.06 nm . Polarization-maintaining fiber pigtail . For use with lithium niobate modulators . High optical power (20 mW, CW) . Hermetic, 14-pin package The D2587P-Type DFB laser module is designed for use with an external lithium niobate modulator and also in applications where high power (20 mW) is required . The use of an internal wavelength locker greatly enhances long-term reliability and reduces chirp and mode dispersion when used in conjunction with LN modulators at OC-192 data rates . A companion device, the D2547P high-power DFB laser module, is also designed for use with a lithium niobate external modulator, but without the use of an internal wavelength locker. AdLib OCR Evaluation Wavelength-Selected, High-Power D2587P-Type (with Wavelength Locker)/D2547P-Type Isolated DFB Laser Modules Description (continued) Controlled Wavelength (D2587-Type) The single-channel, wavelength-selected DFB (ILM) package contains internal wavelength-discriminating optics, i.e ., two etalons and two associated photodiodes. The output consists of analog signals suitable for controlling the electrical current of the thermoelectric cooler (TEC) and the DFB laser. To maintain constant laser frequency, the ratio of the etalon detector signal to that of the power detector, R RREF (the response ratio), must be kept constant . same fiber that is used on the Agere Systems Inc. lithium niobate modulators . It has a mode field diameter of 10 .5 lam, a cladding diameter of 125 lam t 3 lam, and a tightbuffered outer jacket diameter of 900 lam . Figure 1 shows the orientation of polarization in the fiber. Agere Systems' optoelectronic components are being qualified to rigorous internal standards that are consistent with Telcordia Technologies T"' TR-NWT-000468 . All design and manufacturing operations are ISO(c) 9001 certified. The module is being fully qualified for central office applications . Agere provides the beginning-of-life values for six parameters : laser drive current; the single target ITU channel frequency ; laser thermistor resistance for the single specified operating point; the etalon (1 or 2), which is qualified for use with the module, R RREF; and the sign of local etalon slope at ITU point. CORE STRESS ROD PRINCIPLE POLARIZATION AXIS CLADDING INNER COATING (SILICON & ACRYLATE) Controlled Feedback OUTER COATING 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 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 -5 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. Data Sheet June 2002 -n,(c) .a Figure 1 . Polarization-Maintaining Fiber Pin Information Table 1 . Pin Descriptions Pin D2587P-Type D2547P-Type 1 Thermistor Thermistor 2 Thermistor Thermistor Controlled Power 4 Back-facet Monitor Anode (-) Back-facet Monitor Anode (-) A third internal, InGaAs, unfiltered PIN photodiode functions as the back-facet power 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. 5 6 TEC (+)~ TEC (+)~ 8 9 Case Ground X Photodiode 2 Anode Case Ground Case Ground 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 (Z impedance. The laser module is equipped with Fujikura (c) polarizationmaintaining fiber (PMF). The fiber is PANDA type and is the 3 7 10 11 12 13 Laser do Bias (Cathode) (-) Back-facet Monitor Cathode (+) TEC (-)~ X Photodiode 1 Anode Laser Anode (+) 2 RF Laser Input Cathode (-) Laser Anode (+) 2 14 I NC Laser do Bias (Cathode) (-) Back-facet Monitor Cathode (+) TEC (-)~ Case Ground Laser Anode (+) 2 RF Laser Input Cathode (-) Laser Anode (+) 2 I Case Ground 1 . A positive current through the thermoelectric heat pump cools the laser. 2 . Both leads should be grounded for optimum performance . Agere Systems Inc. AdLib OCR Evaluation Wavelength-Selected, High-Power D2587P-Type (with Wavelength Data Sheet June 2002 Locker)/D2547P-Type Isolated DFB Laser Modules Functional Description 7 6 5 4 3 2 1 1-567 Top view . Figure 2. D2547P Circuit Schematic 7 6 5 ---- --- 4 --- TEC ' 3 --- RFC 2 1 LEEP PDPOweR ' PDWAVE 8 PM FIBER PIGTAIL PDWAVE LD ---- ---- ---9 10 ' 11 ' CL ---- ---- ---12 13 14 1-1130(F) Figure 3. D2587P Circuit Schematic LASER MODULE DUAL ETALON B I ~ ISOLATOR AND FIBER COUPLING OPTICS SUBMOUNT E THERMISTOR SUGGESTED ELECTRONICS MODULE (CUSTOMER SUPPLIED) EEPROM ATOD CONVERTER MICROPROCESSO THERMOELECTRIC COOLER R D TO A CONVERTER VOLTAGE PROPORTIONAL TO WAVELENGTH VOLTAGE PROPORTIONAL TO OPTICAL POWER VOLTAGE PROPORTIONAL TO TEMPERATURE Figure 4. Block Diagram Agere Systems Inc . 1-1129(F) 3 AdLib OCR Evaluation Wavelength-Selected, High-Power D2587P-Type (with Wavelength Locker)/D2547P-Type Isolated DFB Laser Modules Data Sheet June 2002 Absolute Maximum Ratings Stresses in excess of the absolute maximum ratings can cause permanent damage to the device . These are absolute stress ratings only. Functional operation of the device is not implied at these or any other conditions in excess of those given in the operations sections of the data sheet. Exposure to absolute maximum ratings for extended periods can adversely affect device reliability. Parameter Symbol Laser do Reverse Voltage Laser do Forward Current Operating Case Temperature Range Storage Case Temperature Range Photodiode do Reverse Voltage Photodiode do Forward Current VRLMAX IFLM,vc Tc Tstg I VRPDMAX IFPDMAX I Min -5 -40 - I Max 2 225 70 852 10 2 Unit V mA C C V mA I 1 . Does not apply to shipping container. 2 . Maximum 2000 hrs . at extreme conditions . Handling Precautions Mounting Instructions Power Sequencing The minimum fiber bend radius is 1 .0 in. (25 .4 mm) . To avoid the possibility of damage to the laser module from power supply switching transients, follow this turn-on sequence : 1 . All ground connections 2. Most negative supply 3. Most positive supply 4. All remaining connections Reverse the order for the proper turn-off sequence. Electrostatic Discharge CAUTION : This device is susceptible to damage as a result of electrostatic discharge . Take proper precautions during both handling and testing . Follow guidelines such as JEDEC Publication No. 108-A (Dec. 1988). Agere employs a human-body model (HBM) for ESDsusceptibility testing and protection-design evaluation. ESD voltage thresholds are dependent on the critical parameters used to define the model . A standard HBM (resistance = 1 .5 kO, capacitance = 100 pF) is widely used and, therefore, can be used for comparison purposes. The HBM ESD threshold presented here was obtained using these circuit parameters: 4 Parameter Value Unit Human-body Model 400 V To avoid degradation in performance, mount the module on the board as follows : Place the bottom flange of the module on a flat heat sink at least 0.5 in . x 1 .180 in. (12 .7 mm x 30 mm) in size. The surface finish of the heat sink should be better than 32 gin. (0.8 gm), and the surface flatness must be better than 0.001 in. (25 .4 gm) . Using thermal conductive grease is optional ; however, thermal performance can be improved by up to 5% if conductive grease is applied between the bottom flange and the heat sink. 2 . Mount four #2-56 screws with Fillister heads (M2-3 mm) at the four screw hole locations (see Outline Diagram). The Fillister head diameter must not exceed 0.140 in. (3.55 mm) . Do not apply more than 1 in.-Ib. of torque to the screws . 0 .062 (1 .58) 0 .118 (3 .00) 0 .086 0 .031 (0 .79) 0 . L_1~6 (3 .56) - (2.1 8) I 0 .129 (3 .28) R 41 .04) Note : Dimensions are in inches and (millimeters) . Figure 5. Fillister Head Screw Agere Systems Inc. Data Sheet June 2002 AdLib OCR Evaluation Wavelength-Selected, High-Power D2587P-Type (with Wavelength Locker)/D2547P-Type Isolated DFB Laser Modules Characteristics Minimum and maximum values are testing requirements. Typical values are device characteristics and are results of engineering evaluations ; they are for information purposes only and are not part of the testing requirements . All parameters are beginning of life, unless otherwise specified . Table 2. D2587-Type Electrical Characteristics (at 25 C laser temperature) Parameter Threshold Current Drive Current Laser Forward Voltage Monitor Reverse-bias Voltage' Monitor Current : Back-facet Monitor X Photodiode 1 X Photodiode 2 Monitor Dark Current Input Impedance Etalon Slope ()2 Frequency Capture Range Symbol ITH VLF Thermistor Current Resistance Ratio3 Thermistor Resistance Laser Submount Temperature TEC Current TEC Voltage TEC Capacity ITC RTH VRMON IRMON Test Conditions LF = 20 mW LF = 20 mW (CW) Po = 20 mW (CW) Min 3 Typ 15 2 5 Max 40 165 2 .5 10 Unit mA mA V V IF = 0, 6 6 6 0.5 15 0.01 25 - 200 200 200 0.1 8 - NA NA NA NA 0 %/GHz GHz 10 9.1 9.5 20 - 9.6 - 100 10.1 10.5 35 1 .7 2 .8 50 I IXPD1 IXPD2 ID ZIN - TSET ITEC VTEC I AT = 5V Measured from fITU toward increasing f and decreasing f TL = 25 C TL = 25 C, Tc = 70 C TL = 25 C, Tc = 70 C I Tc = 70 C I VRMON I I NA kO C A V C 1 . Standard operating condition is 5 .0 V reverse bias. 2 . The (relative) etalon slope is defined as the local slope (in GHz - 1) at the Agere-specified ITU operating point, divided by the R RREF (the response ratio) value at the ITU operating point for the particular module under consideration . Note that the value of this (relative) slope provides information on the precision required by the customer to maintain control of the R RREF ratio to provide frequency locking . For example, 1 %/GHz minimum would mean that the R RREF ratio must be controlled to < 2 .5% of its BOL Agere-specified value in order to provide 2 .5 GHz frequency stability for the module . The local etalon slope may be either positive or negative . 3 . Ratio of thermistor resistance at 0 C to thermistor resistance at 50 C . Agere Systems Inc . 5 AdLib OCR Evaluation Wavelength-Selected, High-Power D2587P-Type (with Wavelength Locker)/D2547P-Type Isolated DFB Laser Modules Data Sheet June 2002 Characteristics (continued) Minimum and maximum values are testing requirements. Typical values are device characteristics and are results of engineering evaluations ; they are for information purposes only and are not part of the testing requirements. All parameters are beginning of life, unless otherwise specified . Table 3 . D2587-Type Optical Characteristics (at 25 C laser temperature) Parameter Peak Optical Output Power Center Wavelength' (See Ordering Information, page 10.) Line Width (3 dB full width) Side-mode Suppression Ratio Relative Intensity Noise Symbol PP Xc Min 20.0 1528.77 Typ - Max 1610.06 Unit mW nm CW, PF = 20.0 mW CW CW, PF = 20 mW 200 MHz