david@mplvax.nosc.MIL (David Almagor) (10/11/87)
I would like to hear from you "Laser experts" if anybody out there, commercially or scientifically is digitally modulating Laser beams, with something more sophisticated than amplitude shift keying or on-off keying. I basically refer to sorts of phase shift keying or something similar. Thanks for the patience, My knowledge in optics is limited. David. -- David Almagor | Phone 619-534-1813 | The Marine Physical lab| or: 619-442-3451 ext. 3173 | UCSD, San Diego, | |david@mplvax.nosc.mil Ca 92152 | |
rhorn@infinet.UUCP (Rob Horn) (10/13/87)
In article <688@mplvax.nosc.MIL> david@mplvax.nosc.MIL (David Almagor) writes: >I would like to hear from you "Laser experts" if anybody out there, >commercially or scientifically is digitally modulating Laser beams, >with something more sophisticated than amplitude shift keying or >on-off keying. I basically refer to sorts of phase shift keying or >something similar. Yes. There is now moderate laboratory experience with coherent optical communications (FSK, PSK, QPSK) and very limited field experience. These have tremendous potential for making bandwidth available. Rates like 20 Gigabits/sec have been demonstrated on a single fiber. For a decent overview of this and related technologies see ATT Technical Journal, Jan/Feb 1987. There was also a joint issue of IEEE Special Areas of Communication and IEEE Optical Society on coherent optical. Finally, look in abstracting services for the keywords coherent optical or distributed feedback lasers (DFB) for other related articles. I included the lasers because DFB is the dominant modulated laser technology at the moment and this improves your hit rate in finding abstracts. -- Rob Horn UUCP: ...harvard!adelie!infinet!rhorn Snail: Infinet, 40 High St., North Andover, MA (Note: harvard!infinet path is in maps but not working yet)