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I'm looking for an High Fidelity analog to fiber optic transmitter/receiver circuit

It is possible to directly send analogue signals over fibre but the linearity is not good.

Modulating your analogue signal onto an high frequency carrier with demodulation at the other end is one way to go.

Transmitting a pulse width modulated pulse train is another. Just recover the pulse train at the receiver using a fairly simple comparator circuit and then average the comparator output to recover the analogue signal. The transmitter design is OK for LEDs but can be more tricky if you're using a laser.

Otherwise, it's A to D => PCM => D to A.

FYI:

Googled:

high fidelity analog fiber optic

found:

http://books.google.co.uk/books?id=t0NePbOZvnIC&pg=PA31&dq=high+fidelity+analog+fiber+optic&hl=en&sa=X&ei=GoL2UMOpBovD0AWsooHABA&ved=0CEUQ6AEwAg#v=onepage&q=high%20fidelity%20analog%20fiber%20optic&f=false

Thank you, I'm on it!