Open AccessRing-core few-mode fiber for tunable true time delay line operation
Author(s) -
Sergi García,
Rubén Guillem,
Ivana Gasulla
Publication year - 2019
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.27.031773
Subject(s) - true time delay , optics , broadband , beamforming , group delay and phase delay , optical fiber , materials science , computer science , phased array , telecommunications , physics , bandwidth (computing) , antenna (radio)
We propose, for the first time to our knowledge, tunable true time delay line operation for radiofrequency signals on a few-mode fiber link. In particular, the custom design of a 7-LP-mode ring-core few-mode fiber together with a set of 5 broadband long period gratings inscribed at the proper positions along the fiber allows 4-sample true time delay line tunability over a 20-nm optical wavelength range. We study the performance of the designed true time delay line in the context of reconfigurable microwave photonics signal processing by theoretically evaluating microwave signal filtering and optical beamforming networks for phased array antennas.