155 mb/s logic interface laser transmitter for oc3/stm1 technical data xmt5170155 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 applications sonet/sdh systems single mode atm fiber to the home data communications networks description the xmt5170155 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 mb/s 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 xmt5170155 has -2.5 dbm mean output power for long haul systems. the xmt5170155 provides analog voltage outputs which are proportional to laser bias 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.
2 connection diagram top view 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, v ee : these pins are connected to ground in +5 v systems and -5 v in negative supply systems. if connected to -5 v supply, the network shown in figure 3 should be placed as close as possible to these pins. pins 6, 8, 9, 12, 18, v cc : these pins are connected to +5 v for positive supply systems and ground for -5 v systems. if connected to +5 v supply, the network shown in figure 3 should be placed as close as possible to these pins. nc laser bias monitor (+) nc laser bias monitor (-) v ee v cc transmit disable v cc v cc nc 120 219 318 417 516 615 714 813 912 10 11 nc laser back facet monitor (+) v cc laser back facet monitor (-) data data v ee case ground (see note below) v cc case ground (see note below) fiber pigtail pin 7, transmit disable: pin 7 floats to v ee when open circuited, enabling the transmitter. it must be biased within +3 v of v cc to disable. pins 11, 13, ground: the xmt5170155 case is plastic, therefore these pins are not connected. pins 15, 16, data, data: these are differential ecl inputs. if open circuited, they will float to v bb (v cc -1.3 v). pin 17, laser back facet monitor (-): see figure 2. pin 19, laser back facet monitor (+): see figure 2. figure 1. laser bias monitor circuitry figure 2. back facet monitor circuitry v cc 200 w 3 k w pin 19 3 k w pin 17 monitor photodiode to laser bias control circuitry modulation current v ee v cc 10 w 3 k w pin 2 3 k w pin 4 i bias laser to device supply pin 10 f 1 nf 100 nf 1.0 h voltage supply (-5 v or +5 v) figure 3. filter network
3 xmt5170155 block diagram data data ecl input laser modulator laser laser bias driver laser bias control photodiode (rear facet monitor) disable laser bias monitor rear facet monitor functional description the ecl inputs allow operation from many logic families and both single-ended or differential signals. as both data and data are internally tied to v bb , for single ended operation the unused input requires no connection or biasing. the disable function disables the laser bias and modulator. the switching threshold is v cc -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 v cc 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.
4 performance specifications absolute maximum ratings stresses in excess of the absolute maximum ratings can cause catastrophic damage to the device. limits apply to each parameter in isolation, all other parameters having values within the recommended operating conditions. it should not be assumed that limiting values of mo re than one parameter can be applied to the product at the same time. exposure to the absolute maximum ratings for extended periods can adv ersely affect device reliability. characteristics 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 agilent for details. 3. other output power options are available. contact agilent for details. 4. common mode signal v ee + 3.5 v nominal. 5. common mode signal v ee + 1.2 v nominal. 6. with v ee connected to -5 v, v cc must be at 0 v. with v cc at +5 v, v ee must be at 0 v. 7. end of life at tmax. parameter minimum nominal maximum units notes supply voltage - - 7 v - operating case temperature xmt5170a155 -40 - +85 c- xmt5170b155 0 - +70 c- storage temperature -40 - +85 c- fiber tensile strength 10 - - n/10s 1 fiber bend radius 32 - - mm - lead soldering (temperature/time) - - +260/10 c/sec - parameter minimum nominal maximum units notes center wavelength 1280 - 1335 nm 2 spectral width (rms) - - 4 nm 2 average output power -5 -2.5 0 dbm 3 extinction ratio 10 - - db - bias monitor - 0.1 - ma/mv 4 rear facet monitor output 5 - 50 mv 5 supply voltage 4.75 5.0 5.5 v 6 supply current - 70 130 ma 7 tx disable v cc -3.2 - v cc v- output waveform sonet/sdh eyemask compliant g.957
5 drawing dimensions h j k f e ?g d 20 11 10 1 b c a l dimensions minimum nominal maximum a 32.9 - 33.2 b 39.5 40 40.5 c16.0 - 16.3 d- -9.27 e2.6 -2.95 f-2.54- ? g - 0.46 - h 2.7 - 3.2 j--4.64 k-10.16- l400 -1220 all dimensions in mm
ordering information xmt5170x155xx connector: fp = fc/pc polish st = st ? sc = sc temperature option: a = -40 c to +85 c b = 0 c to +70 c model name: xmt5170 allowable part numbers: xmt5170a155-fp xmt5170a155-st xmt5170a155-sc xmt5170b155-fp xmt5170b155-st xmt5170b155-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. class 1 laser product: this product conforms to the applicable requirements of 21 cfr 1040 at the date of manufacture date of manufacture: agilent technologies inc., whitehouse road, ipswich, england www.semiconductor.agilent.com data subject to change. copyright ? 2000 agilent technologies, inc. 5966-0511e (11/99)
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