Apparatus and method for adjusting modulation index of analog optical signal using interference phenomenon of coherent light
AssigneeElectronics and Telecommunications Research Institute
InventorsJoonyoung KIM, Minkyu SUNG, Jong Hyun LEE, Seung-Hyun CHO
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Abstract
A method and apparatus for adjusting a modulation index of an analog optical signal using an interference phenomenon of a coherent light, the method including dividing an analog optical signal for a first path and a second path, extracting an optical carrier from an analog optical signal divided for the first path, controlling an intensity and a phase of the optical carrier, and controlling a modulation index of the analog optical signal by combining an analog optical signal divided for the second path and the optical carrier of which the intensity and the phase are controlled.
Claims10
A method of controlling a modulation index of an analog optical signal, the method comprising:
- dividing an analog optical signal for a first path and a second path;
- extracting an optical carrier from an analog optical signal divided for the first path;
- controlling an intensity and a phase of the optical carrier, and
- controlling a modulation index of the analog optical signal by combining an analog optical signal divided for the second path and the optical carrier of which the intensity and the phase are controlled.
An apparatus for controlling a modulation index of an analog optical signal, the apparatus comprising:
- a divider configured to divide an analog optical signal for a first path and a second path;
- an optical carrier recovery configured to extract an optical carrier from an analog optical signal divided for the first path and control an intensity of the extracted optical carrier,
- a phase shifter configured to control a phase of the optical carrier of which the intensity is controlled;
- and
- a coupler configured to output the analog optical signal of which a modulation index is controlled, by combining an analog optical signal divided for the second path and the optical carrier of which the phase is controlled.
Dependencies are inferred from the claim text.