Ultrarapid Optical Frequency-Domain Reflectometry Based Upon Dispersion-Induced Time Stretching: Principle and Applications
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
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Ultrarapid Optical Frequency-Domain Reflectometry Based Upon Dispersion-Induced Time Stretching: Principle and Applications
- Author:
Tae-Jung Ahn, Yongwoo Park, and Jose Aza ´ na˜ ,, Member, IEEE
This paper has reviewed recent progress on a new technique for ultrahigh-speed OFDR, namely, TS-OFDR. This method is essentially based on the use of linear GVD-induced frequencyto-time mapping of the target broadband spectral interferogram so that this information can be captured in real time using a single photodetection stage (single-ended or balanced photoreceiver) and a fast ADC. Advantages of TS-OFDR include: 1) its capability of achieving ultrarapid axial line acquisition rates, as high as the pulse repetition rate from the seeded optical source (up to a few tens of megahertz), 2) the simple all-passive nature of the wavelength sweeping mechanism (linear dispersion), and 3) the possibility of adapting the scheme for conventional time-of-flight measurements, providing a complementary set of performance specifications
