CPC G02F 7/00 (2013.01) [H04B 10/564 (2013.01); H04B 10/69 (2013.01)] | 13 Claims |
1. A method for adding a floating analog voltage signal over a reference analog voltage signal, the method comprising:
outputting a forward analog voltage signal by an analog control unit;
converting, by a forward electrical signal to light converter, the forward analog voltage signal to a forward optical analog signal;
sending the forward optical analog signal over a forward optical path and to an optical splitter;
splitting, by the optical splitter, the forward optical analog signal to (a) a backward optical analog signal and (b) a main part optical analog signal;
converting the main part optical analog signal to the floating analog voltage signal, wherein the converting is executed by a forward light to electrical signal converter;
adding the floating analog voltage signal to the reference analog voltage signal to provide an output analog voltage signal;
sending the backward optical analog signal via an optical feedback path to a backward light to electrical signal converter;
converting the backward optical analog signal to a feedback analog voltage, wherein the converting is executed by the backward light to electrical signal converter;
feeding the feedback analog voltage signal to the analog control unit; and
setting a value of the forward analog voltage signal based on the feedback analog voltage;
wherein a value of the floating analog signal is a fraction of a value of the reference analog voltage signal.
|