oplink communications , in c. parameter symbol minimum maximum units storage temperature t st - 40 + 85 c operating case temperature 1 i option (sr & ir only) v op - 40 + 85 c h option 0 + 70 supply voltage v cc - v ee 0 + 6.0 v input voltage v in - v ee v ee v cc - v ee v lead soldering temperature & time - - 260c, 10 sec absolute maximum ratings oc-48/stm-16 transmitter stx48 series the stx48 modules are laser transmitters designed to meet or exceed the sonet/sdh optical interface requirements at oc-48/stm-16 (2.5 gb/s) data rate. many performance versions are available which are fully compliant with short reach, intermediate reach and long reach specif - cations at 1310 nm or 1550 nm wavelength. the short reach version uses uncooled fabry perot lasers while the intermediate reach version uses uncooled dfb lasers. for the long reach version, uncooled dfb lasers with internal optical isolators are used. all modules satisfy class i laser safety requirements in accordance with the us fda/cdrh and interna - tional iec-825 standards. the transmitter incorporates an automatic power control (apc) circuit to maintain the optical output power at a constant level against variations in ambient temperature and device aging. it also features a mode selec - tor input pin which selects between clocked and non-clocked operation. in the clocked operation mode, the input data is resynchronized by the input clock before driving the laser diode in order to reduce output jit - ter to a minimum. a transmitter disable control input is also provided. both the laser bias current and back-facet light output can be monitored as well. all stx48 transmitter modules are available in two power supply options: single +5v and single -5 v. the data and clock interface can either be direct pecl/ecl or via ac coupling. the operating temperature range is -40c to +85c for the short reach and intermediate reach 1310 nm ver - sion and 0c to +70c for the long reach version. all modules are housed in a 24-pin dual-in-line metal package with a single mode fber pigtail, which is terminated with st, fc or sc connector. product description ? fully compliant with sonet/sdh oc-48/ stm-16 (2.5 gb/s) specifcations ? long reach 1310 nm & 1550 nm as well as intermediate reach and short reach ? eye safe (class i laser safety) ? mode selector switch between clocked or non- clocked operation ? -40c to +85c operating temperature (intermediate reach and short reach) ? 24-pin dip metal package ? fc, st, sc-connectorized fber pigtails ? diferential pecl data & clock interface ? single +5 v and - 5 v supply option features r04.2008.04.30
oplink communications , inc. transmitter performance characteristics stx48 series (over operating case temperature.) parameter symbol minimum typical maximum units data rate b 0.05 2.5 3.0 gb/s average optical output power (50% duty cycle) p o - 10.0 - 7.0 - 3.0 dbm - 5.0 - 3.0 0 - 2.0 0 3.0 extinction ratio p hi /p lo 8.2 - - db center wavelength short reach (sr) c 1266 1310 1360 nm intermediate reach (ir) 1266 1310 1360 long reach (lr) 1310 nm 1280 1310 1335 long reach (lr) 1550 nm 1500 1550 1580 spectral width (rms) short reach ? rms - - 4.0 nm spectral width (-20 db) intermediate reach & long reach ? 20 - - 1.0 side mode suppression ratio intermediate reach & long reach smsr 30 - - db transmitter output eye compliant with bellcore tr-nwt-000253 and itu-t recommendation g.957 receiver electrical interface parameter symbol minimum typical maximum units supply voltage 1 v cc - v ee 4.75 5.0 5.25 v supply current i - 200 300 ma input high voltage (data & clock, pecl) v ih v cc - 1.165 - v cc - 0.880 v input low voltage (data & clock, pecl) v il v cc - 1.810 - v cc - 1.475 v input voltage (data & clock, pecl) v in 0.30 0.80 1.00 vp-p input data & clock timing t dc 200 - 300 ps mode selector input voltage clocked v msck v ee - v ee + 1.5 v non-clocked v msnck v cc - 1.5 - v cc v transmitter disable voltage v dis v cc - 2.0 - v cc v transmitter enable voltage v en v ee - v ee + 0.6 v ld bias alarm output voltage high voltage v almh v cc - v ee v cc v los voltage v alml v ee - 1.0 - v ee + 0.5 v diferential bias monitor voltage at 25 v bm, dif - 100 200 mv decreasing light input - 300 500 diferential back facet monitor voltage v fm,dif 10 100 250 mv 1 for +5v single supply modules, connect vcc to +5v and vee to 0v or gnd (circuit ground). the package housing is internally connected to vee. for - 5v single supply modules, connect vcc to 0v or gnd (circuit ground) and vee to - 5v. the package housing is internally connected to vcc. 2 r04.2008.04.30 related oc-48/stm-16 transceiver & receiver modules srx-48 : receiver without clock recovery (24-pin dip) src-48 : receiver with clock recovery (24-pin dip) dtr-2488-sm : transceiver without clock recovery (industry standard 1x9 package) dtr-2488-sm2 : transceiver without clock recovery (industry standard 2x9 package) dtc-48 : transceiver with clock recovery (industry standard 2x9 package)
oplink communications , inc. application notes interface circuit differential direct-coupled pecl stx-48 7 / 18 50 oh m lin e 50 ohm li ne 50 ohm li ne 50 oh m li ne 0. 01 vc c - 2 v 5 / 20 da ta + / cl k+ da ta - / clk- 6 / 19 stx-48 7 / 18 0. 01 0. 02 2 5 / 20 da ta +/ clk+ 6 / 19 0. 02 2 da ta -/ clk- differential ac-coupled c ontro l circu it bias ci rc ui t 200? 10? pd i mo n i b ld 3k? 3k? fm + bm + vc c vc c ve e ve e fm - bm - 3k? 3k? t dc da ta cl oc k monitor circuit timing diagram (clocked operation) stx48 series r04.2008.04.30 3 when the data+ input is at logic high and data- input is at logic low, the ld is on; and vice versa. the transmitter is normally enabled (i.e. when the tx disable control input is not connected). when the tx disable input voltage is higher than v cc - 2 v, the laser is disabled (less than -30dbm output power) independent of the input data. the transmitter incorporates an average power control (apc) loop to stabilize the transmitter average optical output power against temperature variation. the apc loop always acts to keep the transmitter average optical output power at a constant value (when the transmitter is enabled). therefore, when the input data is all continuous zeroes or all continuous ones, the transmitter optical output power is a constant level equal to the nominal average optical output power (not at the off level or at the on level). when the mode selector input is left unconnected or at logic low ( v ee to v ee + 1.5v), the transmitter is in clocked operation mode. in this mode, the input clock resynchronizes the incoming data to reduce timing jitter. the timing between the data and clock inputs is as shown below. when the mode selector input at logic high ( v cc - 1.5v to v cc ), the transmitter is in non-clocked operation mode. in this mode, the clock inputs are not used and hence need not be provided. the transmitter has internal 50 ohm termination to v td (pin 6) for data inputs & v tc (pin 19) for clock inputs. the data & clock interface can be either direct pecl/ecl coupling or via ac coupling as shown below. the use of diferential signals is strongly recommended. in cases where only single-ended signal is available, the unused data input pin should be biased to v cc - 1.29 v for direct pecl/ ecl coupling or bypassed to ac ground for ac coupling. similarly, the unused clock input pin should be bypassed with a 0.01 f capacitor to v ee .
46335 landing parkway fremont, ca 94538-6407 tel: (510) 933-7200 fax: (510) 933-7300 email: sales@oplink.com oplink communications, inc. reserves the right to make changes in equipment design or specifcations without notice. information supplied by oplink commu - nications, inc. is believed to be accurate and reliable. however, no responsibility is assumed by oplink communications, inc. for its use nor for any infringements of third parties, which may result from its use. no license is granted by implication or otherwise under any patent right of oplink communications, inc. ? 2008, oplink communications, inc. laser safety: all transceivers are class i laser products per fda/cdrh and iec-60825 stan- dards. they must be operated under specifed operating conditions. oplink communications, inc. date of manufacture: this product complies with 21 cfr 1040.10 and 1040.11 meets class i laser safety requirements pin function pin function 1 vcc 24 vcc 2 vcc 23 vcc 3 fm + (ld facet monitor +) 22 bm+ (ld bias monitor +) 4 fm - (ld facet monitor -) 21 bm- (ld bias monitor -) 5 data input - 20 clk - (input clock -) 6 vtd (termination for data) 19 vtc (termination for clk) 7 data input + 18 clk+ (input clock +) 8 do not connect (for internal use only) 17 mode selector (clocked or non-clocked) 9 vcc 16 tx disable input 10 vcc 15 alm (ld bias alarm) 11 vee 14 vee 12 vee 13 vee stx ordering information package outline st48 series r04. 2008.04.30 4 0 0 0 8 4 type 2x5 +5v= 4 2x5 -5v= b temperature range optical output power distance option -7dbm (typ.)= b -3dbm (typ.)= d 0dbm (typ.)= f short reach (-7dbm only)= s0 intermediate reach (-3dbm only)=s3 long reach1310nm (0dbm only)= s4 long reach1550nm (0dbm only)= f2 option pigtail fc= p1 pigtail st= p2 pigtail sc= p3 -40 ~85?c (sr & ir only)= i 0~70?c (lr only)= h (dimension in inches) pinout assignments
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