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| SIL57474X Proposal Specification TO-BIDI* Transceiver Optical Module Coax-BIDITM 1300/1550 nm with DIL10 Adaptation Board and Receiver Preamplifier * * * * * * * * * * Designed for application in passive-optical networks Integrated Wavelength Division Multiplexer Bidirectional Transmission in 2nd and 3rd optical window Laser diode with Multi-Quantum Well structure Suitable for bit rates up to OC-3 and STM-1 Ternary Photodiode at rear mirror for monitoring and control of radiant power Low noise/high bandwidth PIN diode Hermetically sealed subcomponents, similar to TO 18 With singlemode fiber pigtail DIL10 adaptation board with receiver preamplifier Applications Stable Operation with High Capacitance Detectors Low Noise Preamplifiers Single-Ended to Differential Conversion I-to-V Converters Preamp description The TIA is a wide bandwidth, single supply transimpedance amplifier optimized for use in a fiber optic receiver circuit. It is a complete, single chip solution for converting photodiode current into a differential voltage output. The 240 MHz bandwidth enables application in FDDI receivers and SONET/SDH receivers with data rates up to 155 Mbps. The differential outputs drive ECL directly, or can drive a comparator/ fiber optic post amplifier. The IC can be used with a standard ECL power supply (-5.2 V) or a PECL (+5 V) power supply; the common mode at the output is ECL compatible. Siemens Aktiengesellschaft 1/6 January 1998 SIL57474X Maximum Ratings Module Operating Temperature range at case Storage Temperature range Soldering Temperature Tmax = 10 s, 2 mm distance from bottom edge of case Laserdiode Direct forward current Radiant power CW Reverse Voltage Monitor Diode Reverse Voltage Symbol TC Tstg TS Values -40 ... +85 -40 ... +85 260 Unit C C C Symbol IF max e VR max Symbol VR max Values 120 1 2 Values 10 Unit mA mW V Unit V Characteristics All optical data refer to the optical port (10/125m SM fiber), TC = -40 ... +85C Laser Diode Optical Peak Output Power Emission wavelength center of range e = 0.2 mW Spectral bandwidth e = 0.2 mW (RMS) Threshold current Forward voltage e = 0.2 mW Slope Efficiency Differential series resistance Rise Time/Fall Time Ith VF RS tR, tF <5 2...55 < 1.5 10...150 <8 <1 nm mA V mW/A ns Symbol e Values > 0.4 1260...1360 Unit mW nm Siemens Aktiengesellschaft 2/6 January 1998 SIL57474X Monitor Diode Dark Current, VR = 5 V, e = 0 Photocurrent, e = 0.2 mW Capacitance, VR = 5 V, f = 1MHz Tracking Error, VR = 2 V (see note 1) Symbol IR Values < 200 100...800 Unit nA A pF dB C5 TE < 10 -1...1 Detector + Preamplifier Power Supply Tmin to Tmax Operating range single supply Current Bandwidth 3dB Overload Sensitivity (BER > 10 ; Popt (Transmitter) < -7dBm; Imod < 40mA) under discussion Output Noise: (Minimum S/N > 10 (2.4 V/mW / 0.2V/mW) -> equivalent to BER > 10-10) Signal: Output voltage to optical power (Input power < 100 W tbd) Single Ended S * Rtrs Differential S * Rtrs Module Optical Crosstalk (see note 2) Note 1: -10 Symbol Min. +4.5 180 -25 Values Typ. +5 25 240 -6 Max. +11 26 Unit V mA MHz dBm dBm 0.2 V/mW 2.4 4.8 6 12 12 24 V/mW V/mW Symbol Values CRT < -30 Unit dB The tracking error TE is the variation rate of e at constant current Imon over a specified temperature range and relative to the reference point: Imon,ref = Imon(T = 25C, e = 0.2 mW). Thus, TE is given by: TE Note 2: dB = 10 x log Tc e - 25C e e 25C Optical Crosstalk is defined as CRT=10*log(IDet,0 / IDet,1) with: IDet,0 the photo-current with e=0.2 mW, CW laser operation, VR = 2V, with minimum optical return loss from fiber end and IDet,1 the photocurrent without e, but 0.2 mW optical input power, = 1300nm. Siemens Aktiengesellschaft 3/6 January 1998 SIL57474X Proposal for Measuring Crosstalk Needed equipment: * Average Voltmeter (R&S URV5) * Lowpassfilter 125 MHz * Signal generator (Pseudorandom Word generator 155 Mbit/s or Sine wave frequency tbd) Measuring Connect the preamplifier output (perhaps with an additional amplifier - not limiting!!!) with Average Voltmeter Step 1 Output voltage without any incoming optical signal, BIDI internal transmitter off -> Uo Step 2 Output voltage with incoming optical signal 1 W 100% modulated (Pseudorandom Word 155 Mbit/s) light, BIDI internal transmitter off -> U1 Step 3 Output voltage without any incoming optical signal, BIDI internal transmitter modulated (Pseudorandom Word 155 Mbit/s) 10 mApp bias 5 mA (below threshold) > U3 Step 4 Output voltage without any incoming optical signal, BIDI internal transmitter modulated (Pseudorandom Word 155 Mbit/s) 10 mApp bias 25 mA (over threshold) > U4 Calculations: Check the difference U3 (only electrical crosstalk) and U4 electrical + optical crosstalk (electrical crosstalk is dominating if U4 = U3; optical crosstalk is dominating if U4 > U3) Check the needed modulation current for W 100% modulated light (EOL max temp) Imod max and change U3 to U3corr = U3* Imod max [mA]/10. The same procedure for U4. TO_BIDI Performance U1 should be > 10 * Uo Normally the sensitivity will be limited by crosstalk. The needed optical power is Poptical min [W] = 10*U4corr/U1 Siemens Aktiengesellschaft 4/6 January 1998 SIL57474X Accompanying Information T = 25 C: T = 85 C: Threshold current, current above threshold for 0.2 mW output power, monitor current for 0.2 mW output power, peak wavelength. Threshold current, current above threshold for 0.2 mW output power, monitor current for 0.2 mW output power. End of Life Values Parameter Threshold current at T = 85 C Slope efficiency (- 40...+ 85 C) Tracking error (see note 1) Detector dark current, VR = 2 V, T = 85 C Monitor dark current, VR = 2 V, T = 85 C Symbol Values 80 >5 - 1.0...1.0 < 400 <1 Unit mA mW/A dB nA A Ith S TE IR IR Fiber Pigtail Type: single mode, silica Parameter Mode field diameter Cladding diameter Mode field/cladding concentricity error Cladding non-circularity Mode field non-circularity Cut-off wavelength Jacket diameter Bending radius Allowed Tensile strength fiber/case Length Values 9 1 125 2 <1 <2 <6 > 1270 0.9 0.1 > 30 max. 5 1 0.2 Unit m m m % % nm mm Mm N m Siemens Aktiengesellschaft 5/6 January 1998 SIL57474X Laser Diode Radiant Power in Singlemode Fiber 0.4 0.3 0.3 0.25 Relative Radiant Power e = f( ) 100 90 Relative Optical Power 0 5 10 15 20 80 70 60 50 40 30 20 10 0 1306 1308 1310 1312 1314 Wavelength in nm Optical Power in mW 0.2 0.15 0.1 0.05 0 Forward Current in mA Laser Forward Current Monitor Diode Dark Current IR = IF = f(VF) f(TA) port = 0, VR = 5 V 100 90 Forward Current in mA 80 70 60 50 40 30 20 10 0 0 0.4 0.8 1.2 1.6 Forward Voltage in V Package Outlines (Dimensions in mm): 1000 100 Dark Current in nA 10 1 0.1 0.01 -50 0 50 100 Temperature in C Coaxial modules have to be mechanically fixed. Only soldered pins do not fulfill mechanical connection of the coaxial module. Preferred for mechanical connection is our laser flange. Siemens Aktiengesellschaft 6/6 January 1998 |
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