Open AccessPhotonic approach to microwave frequency measurement with digital circular-code results
Author(s) -
Xihua Zou,
Wei Pan,
Bin Luo,
Lianshan Yan,
Yushi Jiang
Publication year - 2011
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.19.020580
Subject(s) - sideband , compatible sideband transmission , optics , microwave , photonics , phase modulation , optical carrier transmission rates , frequency modulation , amplitude modulation , signal (programming language) , modulation (music) , intermediate frequency , optical filter , physics , electronic engineering , computer science , radio frequency , phase noise , telecommunications , acoustics , engineering , radio over fiber , optical fiber , programming language
A photonic approach to measuring microwave frequency with digital results is proposed and experimentally demonstrated. In the proposed approach, N photonic phase-shifted filters with a phase shift increment of π/N in the transmission responses are designed. The filters are then employed to process the single optical sideband generated by applying a microwave signal to a single sideband suppressed-carrier (SSB-SC) modulation module, to perform frequency-to-amplitude conversion and analog-to-digital conversion simultaneously. After the implementation of power detection and decision operation to the filtered optical sideband, an N-bit result in the form of the circular code is obtained, which indicates the frequency of the microwave signal. A proof-of-concept experiment is performed to verify the proposed approach and a 5-bit circular code is generated to indicate microwave frequency up to 40 GHz.