Patent ID: 11965990
Assignee: RESEARCH COOPERATION FOUNDATION OF YEUNGNAM UNIVERSITY
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 8:
9. A method of transmitting a laser signal comprising:
(a) generating light identification data;
(b) generating a plurality of modulated signals for the optical identification data by performing orthogonal frequency division multiplexing (OFDM) modulation on the optical identification data;
(c) generating a plurality of laser signals respectively corresponding to the plurality of modulated signals and having different frequencies; and
(d) simultaneously transmitting the plurality of laser signals to different measurement points according to the frequencies, respectively,
wherein the step (d) comprises:
combining the plurality of laser signals using an optical coupler; and
transmitting the plurality of laser signals combined by the optical coupler by refracting the plurality of laser signals at different angles depending on the frequency using a Risley prism,
wherein, in the step (b), N subcarrier frequencies is randomly selected among S available subcarrier frequencies, where, N is a natural number of 0<N<S, and S is a natural number of S >2, and each of the plurality of modulated signals is generated by performing OFDM modulation on the optical identification data using N subcarrier signals respectively corresponding to the N subcarrier frequencies.