A Microwave Photonics Fiber Loop Ring-Down System


A microwave photonics fiber loop ring-down system is demonstrated in this paper. In comparison with the traditional time domain fiber loop ring-down setup, the demonstrated system is based on pure frequency domain measurement from a microwave-photonic configuration. The system consists of a direct-modulation laser with its modulation frequency scanned by a vector network analyzer. The amplitude and phase spectra of the demonstrated fiber loop ring-down system are then recorded, followed by a complex Fourier transform to acquire the ring-down curve in the time domain. The loss of the fiber loop can then be evaluated based on the calculated ring-down curve. The system delivers high signal-to-noise ratio, and averaging is not required compared with the traditional time domain measurement. The system is also insensitive to the sources of environmental noise. The measurement principle, experimental setup, and the mathematical model of the system are discussed in this paper. A proof-of-concept macrobending loss test is demonstrated


Electrical and Computer Engineering


University of Missouri Research Board
Missouri University of Science and Technology. Materials Research Center
Missouri University of Science and Technology. Intelligent Systems Center


This work was supported in part by the University of Missouri Research Board, in part by the Materials Research Center at Missouri Science and Technology, and in part by the ISC Center Post-Doc Matching Funds at Missouri Science and Technology.

Keywords and Phrases

Communication channels (information theory); Electric network analyzers; Fiber optic sensors; Fibers; Frequency domain analysis; Masers; Microwave measurement; Microwaves; Modulation; Optical fibers; Photonics; Signal to noise ratio; Single mode fibers; Time domain analysis, Fiber loops; Frequency domain measurement; High signal-to-noise ratio; Microwave Photonics; Modulation frequencies; Optical fiber networks; Time domain measurement; Vector network analyzers; Microwave sensors; Fiber loop ring-down

International Standard Serial Number (ISSN)

1530-437X; 1558-1748

Document Type

Article - Journal

Document Version


File Type





© 2017 Institute of Electrical and Electronics Engineers (IEEE), All rights reserved.

Publication Date

01 Oct 2017