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155 Mb/s Logic Interface Laser Transmitter for OC3/STM1 Preliminary Technical Data
XMT5170-155
Features
* SONET/SDH Compliant to STM1 L-1.1 OC3 LR-1 * -40C to +85C Operation * Compact 20 Pin Package * ECL/PECL Logic Interface * Multisourced Pinout * Fully Interchangeable High and Low Power Versions
Description
The XMT5170-155 is a high performance uncooled optical laser transmitter for CCITT SDH and ANSI SONET applications. It is designed with an ECL/PECL logic interface for 155 MBd transmission. The transmitter incorporates several features which simplify system design. It may be operated with either +5 V or -5 V power supplies. 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 XMT5170-155 has -2 dBm mean output power for long haul systems. The XMT5170-155 includes analog outputs which are 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. An evaluation board is available for this product. Contact your local representative for more details.
Applications
* * * * SONET/SDH Systems Single Mode ATM Fiber to the Home Data Communications Networks
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.
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(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 XMT5170-155 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 k PIN 2 10 3 k PIN 4 IBIAS VEE MODULATION CURRENT
3 k PIN 17 MONITOR PHOTODIODE 3 k PIN 19
VCC
200
TO LASER BIAS CONTROL CIRCUITRY
Figure 1. Laser Bias Monitor Circuitry.
Figure 2. Back Facet Monitor Circuitry.
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XMT5170-155 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.
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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 specification. It should not be assumed that limiting values of more than one parameter can be applied to the product at the same time.
Parameter Supply Voltage Operating Case Temperature XMT5170A-155 XMT5170B-155 Storage Temperature Fiber Tensile Strength Fiber Bend Radius Lead Soldering (Temperature/Time)
Minimum -40 0 -40 10 32 -
Nominal -
Maximum 7 +85 +70 +85 +260/10
Units V C C C N/10s mm C/Sec
Notes 1 -
Characteristics
Parameter Center Wavelength Spectral Width (RMS) Average Output Power Rise Time (10% - 90%) Fall Time (10% - 90%) Extinction Ratio Bias Monitor Rear Facet Monitor Output Supply Voltage Supply Current Tx Disable Output Waveform Minimum 1280 -5 10 5 4.75 VCC -3.2 Nominal Maximum Units 1335 nm 4 nm -2.5 0 dBm 2 ns 2 ns dB 0.1 mA/mV 50 mV 5.0 5.5 V 70 130 mA VCC V SONET/SDH Eyemask Compliant G.957 Notes 2 2 3 4 5 6 7 -
Notes: 1. In a coaxial direction with fiber feed through. 2. Over operating temperature range. A narrower operating temperature range will result in a smaller center wavelength spread. Contact Hewlett-Packard for details. 3. Other output power options are available. Contact Hewlett-Packard for details. 4. Common mode signal VEE + 3.5 V nominal. 5. Common mode signal VEE + 1.2 V nominal. 6. With VEE connected to -5 V, VCC must be at 0 V. With V CC at +5 V, VEE must be at 0 V. 7. End of life at Tmax.
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Drawing Dimensions
L 20 11
C
1 B A
10
D J H G F E
K DIM. A B C D E F G H J K L MIN. 32.9 - 16.0 - 2.6 - - 2.7 - - 400 NOM. - - - - - 2.54 0.46 - - 10.16 - MAX. 33.2 17.5 16.3 9.27 2.95 - - 3.2 4.64 - 1220
ALL DIMENSIONS IN MILLIMETERS
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Ordering Information
XMT5170X 155 XX Connector: FP = FC/PC Polish ST* = ST SC = SC Temperature Option: A = -40C to +85C B = 0C to +70C Model Name: XMT5170 Allowable part numbers: XMT5170A-155-FP XMT5170A-155-ST XMT5170A-155-SC XMT5170B-155-FP XMT5170B-155-ST XMT5170B-155-SC
Handling Precautions
1. Normal handling precautions for electrostatic sensitive devices should be taken. 2. Semiconductor lasers can be damaged by overloading or by current surges. Appropriate transient protection should be taken.
*ST is a registered trademark of AT&T.
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