Passive fiber ring as a device for effective refractive index measurement

Vladimir Vasinek; Jan Látal; Petr Koudelka; Petr Šiška; František Hanáček; Jan Skapa

doi:10.1117/12.875316

23 February 2011 Passive fiber ring as a device for effective refractive index measurement

Vladimir Vasinek, Jan Látal, Petr Koudelka, Petr Šiška, František Hanáček, Jan Skapa

Proceedings Volume 7934, Optical Components and Materials VIII; 79341J (2011) https://doi.org/10.1117/12.875316
Event: SPIE OPTO, 2011, San Francisco, California, United States

Abstract

Fiber optic rings are used for synchronization of modes and optical pulses shaping in fiber lasers. The resulting pulses are characterized by stable amplitude and reduced chirp. The length of fiber ring is chosen so as to avoid loss of laser light coherence. New application of optical fiber loops is their inclusion in the closed loop during their excitation by laser light modulated by low-frequency signal and middle frequency signal. If loop also includes amplifying fiber which covers losses incurred by couplers will thus be possible evaluated a signal delay in long loop and thus measure the length of fiber. Reverse task is possibility to measure n_1eff if we know the length of SM fiber loop. This type of designed fiber optic oscillator consists of single-mode optical fiber SM28e in lengths of order of kilometers. This fiber is connected in a series with erbium doped fiber that covers loop losses. Loop, which acts as an oscillator is excited by DFB lasers both at a wavelength of 1550 nm and at wavelength of 1310 nm. The paper will demonstrated the comparison between active and passive fiber loops and their influence to accuracy of effective refractive index measurement.

Citation Download Citation

Vladimir Vasinek, Jan Látal, Petr Koudelka, Petr Šiška, František Hanáček, and Jan Skapa "Passive fiber ring as a device for effective refractive index measurement", Proc. SPIE 7934, Optical Components and Materials VIII, 79341J (23 February 2011); https://doi.org/10.1117/12.875316

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