Method and system using wavelength division multiplexing for eliminating and reducing light diffusion and light reflection interference in interference path

A system using wavelength division multiplexing for eliminating and reducing light diffusion and light reflection interference in interference path, characterized by:

• a WDM (10) is series connected between the end of a sensing optical fiber (6) and a feedback device (2) in the conventional interference optical path structure;
• the WDM (10) is provided with a multiplexed port (10a) and two splitting ports (10b, 10c);
• the corresponding wavelengths of these two splitting ports (10b, 10c) are λ1, λ2 respectively;
• the multiplexed port (10a) is connected with the end of the sensing optical fiber (6);
• the splitting port (10b) is connected with the feedback device (2) and the end of the splitting port (10c) is no use.

A system using wavelength division multiplexing for eliminating and reducing light diffusion and light reflection interference in interference path, characterized by:

• the system is comprising a interference optical path structure including a sensing optical fiber (6) and a feedback device (2);
• the system is further comprising a WDM (10) series connected between the end of a sensing optical fiber (6) and a feedback device (2);
• the WDM (10) is provided with a multiplexed port (10a) and two splitting ports (10b, 10c);
• the corresponding wavelengths of these two splitting ports (10b, 10c) are λ1, λ2 respectively;
• the multiplexed port (10a) is connected with the end of the sensing optical fiber (6);
• the splitting port (10b) is connected with the feedback device (2) and the end of the splitting port (10c) is no use.