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Symmetry 2019, 11(1), 84; https://doi.org/10.3390/sym11010084

Frequency-Octupling Millimeter-Wave Optical Vector Signal Generation via an I/Q Modulator-Based Sagnac Loop

1,* , 2
and
3
1
Institute of Information and Navigation, Air Force Engineering University, Xi’an 710000, China
2
China Xi’an Satellite Control Center, Xi’an 710000, China
3
College of Communications, National University of Defense Technology, Xi’an 710000, China
*
Author to whom correspondence should be addressed.
Received: 18 November 2018 / Revised: 27 December 2018 / Accepted: 8 January 2019 / Published: 14 January 2019
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Abstract

A new method for generating frequency-octupling millimeter-wave (mm-wave) vector signals in optical fields via a Sagnac loop is proposed. In this scheme, two orthogonally polarized fourth order sidebands can be obtained through an integrated dual-polarization quadrature phase shift keying (DP-QPSK) modulator. The two optical sidebands are sent into an I/Q modulator-based Sagnac loop. The I/Q modulator is modulated by a 16QAM baseband signal. In the Sagnac loop, one of the sidebands is modulated by the baseband vector signal along one direction, and the other sideband is unmodulated along the opposite direction because the I/Q modulator has the traveling-wave nature. Thanks to this modulation property and the symmetrical structure of the Sagnac loop, a frequency-octupling mm-wave vector signal that is free from interband beating and fiber chromatic dispersion interference can be generated by the photodetector (PD). After simulating a 20 km single-mode fiber (SMF) transmission, the generated frequency-octupling vector signal was good in function. View Full-Text
Keywords: frequency-octupling; vector signal generation; microwave photonics; Sagnac loop frequency-octupling; vector signal generation; microwave photonics; Sagnac loop
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Yang, Z.; Qu, K.; Liu, X. Frequency-Octupling Millimeter-Wave Optical Vector Signal Generation via an I/Q Modulator-Based Sagnac Loop. Symmetry 2019, 11, 84.

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