- #1
neilgregge
- 3
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Hello,
I have been given an assignment to design an optical communication system. A 12 MHz LED (laser diode would be too easy) signal has to be sent 45km via optic fibre and read at the other end. Simple enough, you may think. however I have been told that I have to use multimodal cable, and all I have read has said that there are insane signal losses associated with multimode (one place, i read there was 2dB loss for every km, whicc was about 90% after 10km), hence its use primarily for internal networks. As repeater stations along the way are prohibited, I am at a loss (much like my signal) as to how to go about this.
Any help would be appreciated,
Neil
I have been given an assignment to design an optical communication system. A 12 MHz LED (laser diode would be too easy) signal has to be sent 45km via optic fibre and read at the other end. Simple enough, you may think. however I have been told that I have to use multimodal cable, and all I have read has said that there are insane signal losses associated with multimode (one place, i read there was 2dB loss for every km, whicc was about 90% after 10km), hence its use primarily for internal networks. As repeater stations along the way are prohibited, I am at a loss (much like my signal) as to how to go about this.
Any help would be appreciated,
Neil