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XMT5170B-622-AP Dataheets PDF



Part Number XMT5170B-622-AP
Manufacturers Agilent(Hewlett-Packard)
Logo Agilent(Hewlett-Packard)
Description 622 Mb/s Logic Interface DFB Laser Transmitter
Datasheet XMT5170B-622-AP DatasheetXMT5170B-622-AP Datasheet (PDF)

622 Mb/s Logic Interface DFB Laser Transmitter Preliminary Technical Data XMT5170-622 Features • SONET/SDH Compliant to STM4 L-4.1 OC12 LR-1 • –40°C to +85°C Operation • Compact 20 Pin Package • ECL/PECL Logic Interface • Multisourced Pinout an ECL/PECL logic interface for 622 MBd transmission. The transmitter incorporates several features which simplify system design. The XMT5170-622 may be operated with either +5 V or –5 V power supplies. Its standard 10 KH ECL data interface enables direct.

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622 Mb/s Logic Interface DFB Laser Transmitter Preliminary Technical Data XMT5170-622 Features • SONET/SDH Compliant to STM4 L-4.1 OC12 LR-1 • –40°C to +85°C Operation • Compact 20 Pin Package • ECL/PECL Logic Interface • Multisourced Pinout an ECL/PECL logic interface for 622 MBd transmission. The transmitter incorporates several features which simplify system design. The XMT5170-622 may be operated with either +5 V or –5 V power supplies. Its standard 10 KH ECL data interface enables direct interface with PECL or ECL logic. The compact transmitter module contains a pigtailed laser, data interface, bias and modulation control circuitry. Thus, no external components or adjustments are necessary. Finally, a laser disable input is provided to shut down the laser for standby or test purposes. The XMT5170-622 includes analog outputs which are Applications • SONET/SDH Systems • Fiber to the Home • Data Communications Networks Description The XMT5170-622 is a high performance uncooled optical DFB laser transmitter for CCITT SDH and ANSI SONET applications. It is designed with proportional to laser current and optical power. These may be used with external circuitry to detect end-of-life, or over temperature conditions. The transmitter is packaged in a 20 pin 0.4" pitch DIP. Contact your local representative for more details. Preliminary Product Disclaimer This preliminary data sheet is provided to assist you in the evaluation of engineering samples of the product which is under development and targeted for release during 1997. Until Hewlett-Packard releases this product for general sales, HP reserves the right to alter prices, specifications, features, capabilities, function, manufacturing release dates, and even general availability of the product at any time. 430 (5/97) Connection Diagram Top View FIBER PIGTAIL NC LASER BIAS MONITOR (+) NC LASER BIAS MONITOR (–) VEE VCC TRANSMIT DISABLE VCC VCC NC 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 NC LASER BACK FACET MONITOR (+) VCC LASER BACK FACET MONITOR (–) DATA DATA VEE CASE GROUND (SEE NOTE BELOW) VCC CASE GROUND (SEE NOTE BELOW) Pin Descriptions Pins 1, 3, 10, 20, NC: These pins should not be connected and should be left open circuit on the application PCB. Pin 2, Laser Bias Monitor (+): See Figure 1. Pin 4, Laser Bias Monitor (–): See Figure 1. Pins 5, 14, VEE: These pins are connected to ground in +5 V systems and –5 V in negative supply systems. Pins 6, 8, 9, 12, 18, VCC: These pins are connected to +5 V for positive supply systems and ground for –5.2 V systems. Pin 7, Transmit Disable: Pin 7 floats to VEE when open circuited, enabling the transmitter. It must be biased within 3 V of VCC to disable. Pins 11, 13, Ground: The XMT5170-622 case is plastic, therefore pins are not connected. Pins 15, 16, DATA, DATA: These are differential ECL inputs. If open circuited they float to VBB (VCC –1.3 V). Pin 17, Laser Back Facet Monitor (–): See Figure 2. Pin 19, Laser Back Facet Monitor (+): See Figure 2. VCC LASER 3 kΩ PIN 19 MONITOR PHOTODIODE 3 kΩ VCC PIN 2 10 Ω PIN 4 3 kΩ MODULATION CURRENT 3 kΩ 200 Ω PIN 17 IBIAS VEE TO LASER BIAS CONTROL CIRCUITRY Figure 1. Laser Bias Monitor Circuitry. Figure 2. Back Facet Monitor Circuitry. 431 XMT5170-622 Block Diagram PHOTODIODE (REAR FACET MONITOR) LASER DATA DATA LASER MODULATOR ECL INPUT DISABLE LASER BIAS DRIVER LASER BIAS MONITOR LASER BIAS CONTROL REAR FACET MONITOR Functional Description The ECL input allows operation from many logic families and both single-ended or differential signals. For single-ended operation both DATA and DATA are internally tied to a VBB. The unused input then requires no connection or biasing. The disable function disables the laser bias and modulator. The switching threshold is VCC –3.2 V. If this input is not connected the module is enabled. This input may be connected to a CMOS HI or tied to VCC to disable. The module provides the necessary bias and modulation control to maintain the extinction ratio at better than 10 dB and the waveform is compliant with SONET/SDH Eyemask standard G.957. The laser bias control loop compensates for temperature induced variations in laser performance. The bias current monitor indicates the amount of dc current supplied to the laser. (This is approximately the laser threshold current). The rear facet monitor is a signal proportional to the laser output power. This can be used as part of a HI/LO light alarm. In the absence of data the laser will emit a mean optical power within the specified limits. The extinction ratio and duty cycle distortion are specified assuring a 50% duty cycle at the correct data rate. 432 Performance Specifications Absolute Maximum Ratings Absolute maximum limits mean that no catastrophic damage will occur if the product is subjected to these ratings for short periods, provided each limiting parameter is in isolation and all other parameters have values within the performance specificat.


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