Absolute distance measurement with a gain-switched dual optical frequency comb

K. Hei, Kaszubowska Anandarajah, Eamonn P. Martin, Guang Shi, Prince M. Anandarajah, N. Bhattacharya

Research output: Contribution to journalArticleScientificpeer-review

11 Citations (Scopus)
128 Downloads (Pure)


The measurement of distance plays an important role in many aspects of modern societies. In this paper, an absolute distance measurement method for arbitrary distance is proposed and demonstrated using mode-resolved spectral interferometry with a gain-switched dual comb. An accuracy of 12 µm, when compared to a He-Ne fringe counting laser interferometer, for a displacement up to 2.5 m is demonstrated by tuning the repetition frequency of the dual comb from 1.1 GHz to 1.4 GHz. The compact measurement system based on a gain-switched dual comb breaks the constraint of periodic ambiguity. The simplification and improvements are significant for further industrial applications.
Original languageEnglish
Pages (from-to)8108-8116
Number of pages9
JournalOptics Express
Issue number6
Publication statusPublished - 2021


Dive into the research topics of 'Absolute distance measurement with a gain-switched dual optical frequency comb'. Together they form a unique fingerprint.

Cite this