dwdm 1.25 gb/s dfb laser module with integral optical isolator technical data lsc26xx features ? center wavelength between 1528 nm and 1602 nm ? extended wavelengths for use in systems requiring no amplifiers ? modulation capability up to 1.25 gb/s ? 30 db internal optical isolation ? 25 w impedance matched ? wide operating temperature range: -20c to +70c ? industry standard hermetic 14 pin butterfly package applications ? metropolitan dwdm ? sonet/sdh systems ? atm, ethernet and proprietary datacommunication networks ? fttc description lsc26xx laser modules are highly reliable fiber optic light sources operating in the 1550 nm band. the internal dfb lasers are based upon ingaasp ridge waveguide multi quantum well technology and fabricated by the metal organic vapor phase epitaxy (movpe) process, resulting in long lifetimes and modest threshold currents. the lsc26xx package includes a photodiode for monitoring the laser output, a thermistor for monitoring laser heatsink temperature, and a peltier effect thermoelectric cooler (tec). a heatsink mounting flange is incorporated into the industry standard 14 pin package, and the tec supports d t of 50c. the lsc26xx also has 30 db of optical isolation which is temperature controlled to maintain isolation over the full operating temperature range. the lsc26xx family of parts gives full dwdm coverage in the edfa 1550 nm window and offers extended wavelengths for use in systems which do not require amplifiers. laser safety warning this device is a class iiib (3b) laser product. it may emit invisible laser radiation if operated with the fiber pigtail disco nnected. to avoid possible eye damage do not look into an unconnected fiber pigtail during laser operation. do not exceed specified ope rating limits.
2 wavelength control wavelength tuning is achieved by adjusting the laser chip temperature. the laser chip temperature is monitored using the internal thermistor. the peltier effect thermoelectric cooler deployed in the lsc26xx is capable of maintaining a 50c temperature difference. the heating mode occurs when pin 7 is positive with respect to pin 6 and the reverse is required for cooling to happen. r.f. matching for optimum high-speed performance the r.f. matching of the drive current is important in directly modulated lasers. the lsc26xx has an internal 25 ohm matching circuit to allow ease of use. there are several options for providing laser dc bias to the lsc26xx. the most widely deployed option is dc biasing via pin 3 and modulating via pin 12. alternatively, some laser driver ics allow both modulation and biasing via their output pin (to lsc26xx pin 12) which results in pin 3 being unused. under such a biasing scheme, it is recommended that pin 3 be decoupled to ground via a 100 nf capacitor to prevent any rf injection or pickup. the latter method is generally avoided due to the additional heat dissipation within the laser driver ic which impacts overall performance.
3 lsc26xx mechanical outline top view back view side view lsc26xx pin connections and block diagram top view dim min nom max a 29.6 - 30.4 b 20.6 - 21.1 c 12.45 - 12.95 d 8.4 - 9.0 e - 0.75 - f - 12.0 - g 5.40 - 5.90 h - 2.54 - i - 0.50 - j - 0.20 - k - 7.0 - l - 30.0 - m 400 - - n - 2.0 - p 4.5 - 6.5 r 8.7 - 9.1 s 25.8 - 26.2 t 2.50 - 2.70 u - 0.75 - v - 17.8 - all dimensions in mm pin connections 1 thermistor 2 thermistor 3 laser dc bias 4 monitor anode 5 monitor cathode 6 tec -ve when heating 7 tec +ve when heating 8 ground 9 ground 10 not connected 11 ground 12 laser modulation 13 ground 14 not connected j c f d g v m k n e p l 7 6 5 4 3 2 1 8 9 10 11 12 13 14 tec u r b s a ?t h i
4 lsc26xx typical operating characteristics product type : lsc26xx modulation bit rate : 1.25 gb/s modulation depth : 10% extinction ratio thermistor res @ +25c kohm 10.393 wavelength nm 1547.73 thermistor res on channel kohm 10.980 dark current na 0.48 threshold current (ith) ma 16.00 power at ith w 0.00 power at ith + 40 ma w 2123.00 slope efficiency mw/ma 0.053
5 absolute maximum ratings at +25c absolute limiting (maximum) ratings mean that no catastrophic damage will occur if the product is subjected to these ratings fo r short periods, provided that 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. performance specifications - laser dispersion penalty [5] notes 1. laser chip temperature between +20c and +30c. 2 exact peak wavelength is specified in the table on page 7. 3. at prbs 2 23-1 , 1.25 gb/s, extinction ratio = 10%, mean output power >1 mw. 4. fiber output power change for constant monitor output current. 5. at prbs 2 23-1 , extinction ratio = 10%, mean output power >1 mw. 6. fiber dispersion 17 ps/nm/km. parameter minimum maximum units laser forward current - 150 ma laser reverse voltage - 3.3 v photodiode forward current - 2.5 ma photodiode reverse voltage (vr) - -10 v fiber pull strength - 10 n operating temperature (case) -20 +85 c storage temperature -40 +85 c mechanical shock mil-std 883, method 2002, test condition b vibration mil-std 883, method 2007, test condition a tec current - 1.1 a tec voltage - 3.0 v parameter minimum typical maximum units threshold current (ith) [1] 10 - 35 ma peak wavelength [2] [3] 1528 - 1602 nm spectral width (-30 db) modulated [3] - - 0.6 nm peak wavelength change with chip temperature [1] - 0.08 0.2 nm/c sidemodes suppression ratio (modulated) [3] 34 - - db tracking error, +75c case, +25c chip [4] - - 0.5 db tracking error, -20c case, +25c chip - - 0.5 db flatness of frequency response (300 mhz to 2 ghz) - - 1.5 db slope efficiency [1] 0.05 - - mw/ma output power (peak power, pk) [1] 2 - - mw center wavelength drift with case temperature - 0.2 0.5 pm/c data rate distance [6] dispersion penalty (maximum) 1.25 gb/s 120 km 2 db 622 mb/s 400 km 2 db
6 performance specifications - monitor photodiode thermistor tec fiber pigtail: tight jacketed, self-mode stripping, single mode fiber the pigtail length can be customized to your specific length, with a connector, to a tolerance of 25 mm. parameter minimum maximum units photocurrent (im) at 2 mw (pk power) 0.2 2.0 ma dark current (vr = -5 v) at +25c - 100 na parameter symbol test conditions t chip = +25c, pf = rated pk power test limits units min. max. resistance rt 9.5 10.5 k w temperature coefficient of rt d rt/ d t typ. -4.4 %dr/k b constant b 0c to +50c typ. 3900 k parameter symbol test conditions t chip = +25c, pf = rated pk power test limits units min. max. tec cooling current ic d t = -45c, t case = +70c -1.0a tec heating current ih d t = +45c, t case = -20c -1.0a voltage vc t case = -20c, to +70c - 3.0 v parameter minimum maximum units length 0.4 - m spot size (mode radius) 4.5 5.5 m cladding diameter 122 128 m core/cladding concentricity - 1.0 m secondary jacket diameter 0.8 1.0 mm effective cut-off wavelength 1150 1240 nm
7 ordering information lsc26xx - xx connector type: fp = fc/pc polish channel number 7. wavelength is adjusted using chip temperature. hp part no. wavelength (nm) [7] frequency (thz) hp part no. wavelength (nm) [7] frequency (thz) hp part no. wavelength (nm) [7] frequency (thz) lsc2698 1528.773 196.1 lsc2630 1553.329 193.0 lsc2660 1577.855 190.0 lsc2699 1529.553 196.0 lsc2631 1554.134 192.9 lsc2661 1578.686 189.9 lsc2601 1530.334 195.9 lsc2632 1554.940 192.8 lsc2662 1579.518 189.8 lsc2602 1531.116 195.8 lsc2633 1555.747 192.7 lsc2663 1580.350 189.7 lsc2603 1531.898 195.7 lsc2634 1556.555 192.6 lsc2664 1581.184 189.6 lsc2604 1532.681 195.6 lsc2635 1557.363 192.5 lsc2665 1582.018 189.5 lsc2605 1533.465 195.5 lsc2636 1558.173 192.4 lsc2666 1582.854 189.4 lsc2606 1534.250 195.4 lsc2637 1558.983 192.3 lsc2667 1583.690 189.3 lsc2607 1535.036 195.3 lsc2638 1559.794 192.2 lsc2668 1584.527 189.2 lsc2608 1535.822 195.2 lsc2639 1560.606 192.1 lsc2669 1585.365 189.1 lsc2609 1536.609 195.1 lsc2640 1561.419 192.0 lsc2670 1586.203 189.0 lsc2610 1537.397 195.0 lsc2641 1562.233 191.9 lsc2671 1587.043 188.9 lsc2611 1538.186 194.9 lsc2642 1563.047 191.8 lsc2672 1587.884 188.8 lsc2612 1538.976 194.8 lsc2643 1563.863 191.7 lsc2673 1588.725 188.7 lsc2613 1539.766 194.7 lsc2644 1564.679 191.6 lsc2674 1589.568 188.6 lsc2614 1540.557 194.6 lsc2645 1565.496 191.5 lsc2675 1590.411 188.5 lsc2615 1541.349 194.5 lsc2646 1566.314 191.4 lsc2676 1591.255 188.4 lsc2616 1542.142 194.4 lsc2647 1567.133 191.3 lsc2677 1592.100 188.3 LSC2617 1542.936 194.3 lsc2648 1567.952 191.2 lsc2678 1592.946 188.2 lsc2618 1543.730 194.2 lsc2649 1568.773 191.1 lsc2679 1593.793 188.1 lsc2619 1544.526 194.1 lsc2650 1569.594 191.0 lsc2680 1594.641 188.0 lsc2620 1545.322 194.0 lsc2651 1570.416 190.9 lsc2681 1595.489 187.9 lsc2621 1546.119 193.9 lsc2652 1571.239 190.8 lsc2682 1596.339 187.8 lsc2622 1546.917 193.8 lsc2653 1572.063 190.7 lsc2683 1597.189 187.7 lsc2623 1547.715 193.7 lsc2654 1572.888 190.6 lsc2684 1598.041 187.6 lsc2624 1548.515 193.6 lsc2655 1573.714 190.5 lsc2685 1598.893 187.5 lsc2625 1549.315 193.5 lsc2656 1574.540 190.4 lsc2686 1599.746 187.4 lsc2626 1550.116 193.4 lsc2657 1575.368 190.3 lsc2687 1600.600 187.3 lsc2627 1550.918 193.3 lsc2658 1576.196 190.2 lsc2688 1601.455 187.2 lsc2628 1551.721 193.2 lsc2659 1577.025 190.1 lsc2689 1602.311 187.1 lsc2629 1552.524 193.1
www.hp.com/go/fiber for technical assistance or the location of your nearest hewlett-packard sales office, distributor or representative call: americas/canada: 1-800-235-0312 or 408-654-8675 far east/australasia: call your local hp sales office. japan: (81 3) 3335-8152 europe: call your local hp sales office. data subject to change. copyright ? 1999 hewlett-packard co. 5968-5629e (5/99) handling precautions 1. the lsc26xx can be damaged by current surges or overvoltage. 2. power supply transient precautions should be taken. 3. normal handling precautions for electrostatic sensitive devices should be taken. invisible laser radiation - avoid direct exposure to beam peak power 10 mw wavelength 1550 nm class iii b laser product laser warning danger cdrh certification hewlett-packard ltd. whitehouse road ipswich, suffolk ip1 5pb england manufactured: serial no: model no: this product conforms to the applicable requirements of 21 cfr 1040 at the date of manufacture.
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