Method of producing a semiconductor laser adapted for use in an

Details Method of producing a semiconductor laser adapted for use in an Method of producing a semiconductor laser adapted for use in an

1989-10-13

1991-07-23

Chaudhuri, Olik

Fishing, trapping, and vermin destroying

148DIG95, 148DIG162, 437129, 437133, H01L 2166, H01L 2120

Patent

active

050343343

ABSTRACT:
An advantageous method of fabricating lasers adapted for use in a multichannel analog optical fiber communication system, e.g., a CATV system, is disclosed. A laser generally can be used in such a communication system only if it meets, inter alia, very stringent intermodulation specifications. To identify such lasers typically requires extensive testing. It has now been discovered that certain readily determinable parameters can be used to predict the intermodulation behavior of a given device. This discovery makes possible a simpler, and therefore less costly, process of identifying suitable lasers, resulting in a more economical method of making lasers for the stated application. The method comprises measuring the light versus current (L versus I) characteristic of a given laser, determining therefrom the first, second, and possibly higher, order derivatives of L with respect to I, and determining thereform a parameter that is a predictor of the distortion behavior of the laser. Exemplarily, the quantity is the normalized second order distortion (2HD/C), defined as 20 log (mL"/4L'.sup.2), where m is the modulation index, and L' and L" are the first and second derivatives, respectively, of L. 2HD/C has a pronounced minimum at I=I.sub.op , the current at which L"=0. Advantageously, lasers are selected that have 2HD/C less than a predetermined value (e.g., -70 dbc, with m=0.04) over a relatively wide current range (e.g., at least 4 mA).

REFERENCES:
patent: 4372791 (1983-02-01), Hsieh
patent: 4451146 (1984-05-01), Grage et al.
patent: 4489477 (1984-12-01), Chik et al.
patent: 4540451 (1985-09-01), Leibenzeder et al.
patent: 4560246 (1985-12-01), Cotter
patent: 4573255 (1986-03-01), Gordon et al.
patent: 4680810 (1987-07-01), Swartz
patent: 4714826 (1987-12-01), Goutzoulis
patent: 4777146 (1988-10-01), Bylsma et al.
patent: 4820047 (1989-04-01), Snyder
"60-Channel FM Video Subcarrier Multiplexed Optical Communication System", by R. Olshansky et al., Electronics Letters, vol. 23, No. 22, Oct. 22, 1987, pp. 1196-1197.
"Growth and Characterization of High Yield, Reliable, High-Power, High-Speed, InP/InGaAsP Capped Mesa Buried Heterostructure Distributed Feedback (CMBH-DFB) Lasers", by J. L. Zilko et al., IEEE Journal of Quantum Electronics, vol. 25, No. 10, Oct. 1989, pp. 2091-2095.

Affiliated with

Also associated with

Rating

Method of producing a semiconductor laser adapted for use in an does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method of producing a semiconductor laser adapted for use in an , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of producing a semiconductor laser adapted for use in an will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-432095