pinfet optical receiver modules high sensitivity high overload power wide dynamic range 850, 1310, 1550nm operation hermetic package custom bandwidths available the laser diode incorporated pinfet provides an excellent solution for optical receiver systems that require both high sensitivity and wide dynamic range. applications include telecommunications line-terminating equipment or repeaters and optical sensor systems. the receiver package offers high reliability satisfying telcordia specifications. the term "pinfet" (p-intrinsic-n, field-effect transistor) indicates the integration of a pin photodiode and a discrete, high-performance transimpedance amplifier stage. light is coupled into the detector stage through a multimode optical fiber pigtail, which allows excellent coupling with either singlemode or multimode fiber systems. tyco electronics/ldi 2 olsen avenue edison, new jersey 08820 usa voice: 732-549-9001 fax: 732-906-1559 internet: www.laserdiode.com e-mail: sales@laserdiode.com laser diode incorporated 10-4400-0008 rev. b fiber optic business unit
specifications and limits notes: 2. a given bandwidth will typically support an nrz data rate of 1.4 times the 3 db bandwidth. 1. bandwidth is measured at the -3 db point. 3. sensitivity is calculated using the noise voltage measured at 25 o c at the output of a 3-pole butterworth filter whose bandwidth equals that of the pinfets minimum specified bandwidth. sensitivity is specified as the average optical power in dbm measured at 1300nm and t a =25 o c for a ber of 10 -9 . dark current @ -5 v maximum optical input @ -5 v sensitivity derating over operating temperature ingaas detector responsivity 1300 nm 1550 nm si detector responsivity 850 nm maximum output signal level output impedance load impedance power supply current +5 v power supply current -5 v ldpf series min typ max 0.50 1 sensitivity level (dbm) +25db <1 0.9 0.95 - 2.5 10 1000 25 35 10 15 ldpw series min typ max 0.50 1 -3 0 <1 0.9 0.95 - 0.8 10 1000 25 35 10 15 ldsf series min typ max 0.50 1 sensitivity level (dbm) +25db <1 - - 0.50 2.5 10 1000 operating temperature storage temperature positive supply voltage negative supply voltage detector bias soldering time at 260 o c absolute maximum ratings ldpf series -40to70 -40to85 7 -7 -20 10 ldpw series -40to70 -40to85 7 -7 -20 10 ldsf series -40to70 -40to85 7 -7 -20 10 o c o c v v v secs na dbm db a/w a/w v pp ohms ohms ma ma minimum bandwidth 1 (mhz) suggested data rate (mb/s) sensitivity 3 (dbm) min typ transimpedance (kohms) performance @ 25 c (+/- 5.0 vdc) ldpf series ldpw series ldsf series dynamic range (db) o common characteristics @ 25 c o 10 15 25 35 fiber specifications fiber type multimode tight buffer other fiber types are available. please contact the laser diode sales department or your local laser diode representative. n/a 0.2 nominal size (um) 50/12 5/245/90 0 cladding tolerance 125 +/-2.0 um index profile graded 900 um buffer material hytrel 10-4400-0008 rev. b 2 laser diode's standard pinfets use a low dark current, indium gallium arsenide (ingaas) pin photodiode with high responsivity between wavelengths of 1100nm and 1600nm (higher wavelengths also available). the detector is mounted directly onto a hybrid circuit assembly for optimum signal performance. in addition, low-noise mesfets are used in the amplifier stages to further enhance device performance. the fiber pigtail is actively aligned with the detector and soldered in place to provide a highly stable coupling mechanism. the ldpf series pinfet receiver is ldi's highest sensitivity product. the sensitivity is maximized at a particular bandwidth that may be selected from our standard offering or can be defined by the customer for high volume applications. this product contains no automatic gain control (agc) so the dynamic range is limited to 25 db. the ldpw series pinfet includes agc and has been optimized for wide dynamic range operation ( up to 0 dbm )while maintaining a very high sensitivity level. typ ldpw 0003 ldpw 0012 ldpw 0024 ldpw 0036 ldpw 0065 ldpw 0110 3 12 24 36 65 110 4 17 34 52 90 155 -54 -56 -50 -52 -48 -50 -46 -48 -41 -43 -38 -40 53 49 47 45 40 37 1100 350 340 210 60 30 ldsf 0004 ldsf 0012 ldsf 0024 ldsf 0032 ldsf 0065 ldsf 0120 ldsf 0250 4 12 24 32 65 120 250 6 17 34 45 90 168 350 -51 -56 -48 -52 -44 -50 -43 -48 -38 -43 -34 -40 -29 -31 25 25 25 25 25 25 25 1100 740 340 210 80 40 10 ldpf 0004 ldpf 0012 ldpf 0024 ldpf 0032 ldpf 0065 ldpf 0120 ldpf 0250 4 12 24 32 65 120 250 6 17 34 45 90 168 350 -54 -56 -51 -53 -48 -50 -47 -49 -43 -45 -40 -42 -35 -37 25 25 25 25 25 25 25 1100 740 340 210 80 40 10 units supply voltage v 4.5 5.5 4.5 5.5 4.5 5.5 units ingaas detectors mounted on ceramic submounts for use in pinfet products typ fiber yield strength (n) fiber bend radius min. (mm) 10 30
pin pin assignments function photodetector bias (-5v) 0.1 f -5v 1 330 0.1 f 0.1 f 0.1 f 2.2k ? 0.1 f 0.1 f 2.2k ldpf ldpw ldsf +5v 14 kv n t g 2. sensitivity is the minimum optical input power required to achieve a targeted bit error rate (ber). sensitivity is determined by measuring the noise voltage at the output of a 3-pole butterworth filter with a bandwidth equal to the minimum required bandwidth. sensiti- vity is calculated by using the noise voltage value in the following equation: sensitivity (dbm) = 10 log where: k is a constant determined by the target ber, i.e. v n is the noise voltage in millivolts. t g is the transfer gain in v/ w. it is defined as the voltage out per unit of optical power into the pinfet. this can be calculated using: t g = responsivity (a/w multiplied by transimpedance (ohms). 3. to calculate the output voltage (peak-to-peak) of a pinfet, use the following equation: v out =2p in xt g where: p in is the average optical input power in watts. t g is defined in 2 above. 4. when designing a receiver using ldi's transimpedance pinfets, the following practices should be observed: a. match the output impedance to 1 kohm. a suitable schematic is shown herein. b. for maximum stability, use a low impedance ground return in your design. c. if your voltage supply lines are susceptible to noise, use a full lc filter close to the pinfet module. ber 10 -9 10 -10 k 6.0 6.4 10-4400-0008 rev. b 1 2,6,9,11 12,13,14 3,5,8 4 7 10 -5 v detector bias no connection no connection ground -5 volts output +5 volts functional diagram - ldpf series receiver connector, optional 1.0 meter nominal fiber length 0.38 [9.5] 0.19 [4.7] 0.21 [5.2] 0.10 [2.51] 0.018 [0.46] c l 0.10 [2.54] 0.82 [20.8] 0.30 [7.6] 0.50 [12.7] o 0.75 [19.1] ? ? outline drawing laser diode's standard or custom bandwidth tuned products offer optimized sensitivity at the specified bandwidth. a pinfet essentially operates as an analog receiver. however, in the great majority of applications, they are used to receive digital information. a given bandwidth will typically support an nrz data rate of 1.4 times the specified 3 db bandwidth. 1. typical interface - ldpf, ldpw, and ldsf series application notes: characteristic testing of pinfet receivers. fiber pigtail -5v pins 3,5,8 pin 4 -5v +5v pin 10 pin 7 output pin 1 top view
pinfet optical receiver modules model numbers using the performance tabl es i n this d ocument, select a series and a bandwidth w i thin the series and use the following numbers to ord er: ? 10-4400-0008 rev. b tyco electronics/ldi 2 olsen avenue edison, new jersey 08820 usa voice: 732-549-9001 fax: 732-906-1559 internet: www.laserdiode.com e-mail: sales@laserdiode.com fiber optic business unit laser diode incorporated product changes laser diode incorporated reserves the right to make changes to the product(s) or information contained herein without notice. no liability is assumed as a result of their use or application. handling precautions handle optical fiber with normal care, avoiding stretch, tension, twist, kink or bend abuse. products are subject to the risks normally associated with sensitive electronic devices including static discharge, transients, and overload. ordering products can be ordered directly from laser diode incorporated or its representatives. when ordering, refer to the model numbers below. for a complete listing of representatives, visit our website at www.laserdiode.com. special orders some products can be supplied with performance characteristics to meet unique customer requirements and differ from those indicated herein. contact the laser diode incorporated sales department or your local representative to discuss your individual requirements. for a complete listing of representatives, visit our website at www.laserdiode.com. ldpf series high sensitivity ldpf 0004xx ldpf 0012xx ldpf 0024xx ldpf 0032xx ldpf 0065xx ldpf 0120xx ldpf 0250xx ldpw series wide dynamic range ldpw 0003xx ldpw 0012xx ldpw 0024xx ldpw 0036xx ldpw 0065xx ldpw 0110xx ldsf series 850nm operation ldsf 0004xx ldsf 0012xx ldsf 0024xx ldsf 0032xx ldsf 0065xx ldsf 0120xx ldsf 0250xx note: to indicate the pigtail connector termination you require, substitute one of the following designations for "xx" in the above table: no suffix indicates no connector. use fc to indicate an fc/pc type connector. use lc to indicate an lc/pc type connector. use sc to indicate an sc/pc type connector. use st to indicate an st type connector. our sites in edison, new jersey 2 olsen avenue 4 olsen avenue
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