DocumentCode :
1116736
Title :
Compact 1.3-µm laser transmitter for the SL undersea lightwave system
Author :
Bosch, Fridolin ; Palmer, G.M. ; Sallada, Charles D. ; Swan, C. Burke
Author_Institution :
AT&T Bell Laboratories, Allentown, PA, USA
Volume :
2
Issue :
6
fYear :
1984
fDate :
12/1/1984 12:00:00 AM
Firstpage :
952
Lastpage :
959
Abstract :
The mechanical, optical, and electrical design leading to a reliable, high-performance, robust, and compact transmitter are described. Reliability considerations are of paramount importance in the design of undersea systems. Main features of the laser-fiber-monitor package and the light-feedback control strategy are outlined. The functions of the laser drive circuit, consisting of a low-speed feedback IC and a high-speed modulation IC are discussed. Access to multiple test points through an edge board connector permits automated tuning and reliability testing. The transmitter circuit can provide a 200-mA bias current, about double the expected end of life laser bias requirement, and 60-mA modulation current, double the typical value, with < 0.75-ns rise and fall time. The transmitter operates up to 800 Mbit/s, far beyond the TAT-8 bit rate of 295.6 Mbit/s. Transmitter redundancy is planned to meet the extreme reliability requirements for the transatlantic system. Up to four of the compact transmitters can be mounted per regenerator, thus providing as many as three redundant transmitters for improved system reliability.
Keywords :
Optical fiber transmitters, lasers; Underwater optical fiber systems; Automatic testing; Circuit testing; High speed integrated circuits; High speed optical techniques; Laser feedback; Laser tuning; Optical design; Optical feedback; Optical transmitters; Repeaters;
fLanguage :
English
Journal_Title :
Lightwave Technology, Journal of
Publisher :
ieee
ISSN :
0733-8724
Type :
jour
DOI :
10.1109/JLT.1984.1073710
Filename :
1073710
Link To Document :
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