www.Usenet.com
www.Usenet.com
| <-- __Chronological__ --> | <-- __Thread__ --> |
You can get some really low cost ITU grid lasers here
http://www.coloradophotonics.com/
They have Lasers on 50GHz grid and you can choose which wavelengths you want. Check out http://www.coloradophotonics.com/Itemdetail.asp?ID=9
In article <[EMAIL PROTECTED]>, [EMAIL PROTECTED] (Jmm39531) wrote:
I hope some readers in this newsgroup can help me with a few fiber optics &
laser diode questions... I am working on a project in which I will be
multiplexing 4 fiber optic signals onto a single fiber. Luminent sells CWDM
laser diode modules that I might use, with wavelengths spaced 20 nm apart. Two of my signals are clocks (in the range of 10 to 50 MHz), another signal
will be a GPS 1PPS signal, and another will be a GPS time-stamp in async RS-232
type format. The PPS signal is logic high for 20 usec, and logic low for the
remaining 999980 usec. The time-stamp signal is 9600 bps, will be about 30
msec in duration and logic low for the remaining 970 msec. (The PPS and time
stamp are for time-tagging of data in a remote battery powered system).
My question is: Is it possible to send single short pulses or short series of
characters over fiber between LDs and PINFETs? I have only heard of sending
continuous streams of data. Aren't PINFET outputs AC-coupled, so I would need
to design a special receiver circuit?
And another question: If I used simple on/off keying as the modulation scheme,
would that cause sufficient "chirping" which could interfere with the other
channels in the single fiber? Any advice on LD driver circuits and PINFET
receiver circuits would be greatly appreciated (or a link I could go to to read
more).
Thanks.
| <-- __Chronological__ --> | <-- __Thread__ --> |
