Re: modulation, bit rate, lasers and diodes sources

Yet another point: turning a signal source on and off abruptly creates sidebands. The greater the selectivity of the receiver, the slower such modulation must proceed. Turning an incoherent diode with all its simultaneous frequencies on and off creates even broader sidebands and lowers the available speed. I can't guess the modulation speed that makes this an issue.

Jerry

On Jan 17, 12:52&#4294967295;pm, Jerry Avins <j...@ieee.org> wrote:
> Yet another point: turning a signal source on and off abruptly creates sidebands. The greater the selectivity of the receiver, the slower such modulation must proceed. Turning an incoherent diode with all its simultaneous frequencies on and off creates even broader sidebands and lowers the available speed. I can't guess the modulation speed that makes this an issue.
>
> Jerry

I recall in 2000, rates of 4 to 10 GBPS were becoming "routine" with
the solitons.

Clay