Abstract
We propose and demonstrate for the first time an optical single-sideband (OSSB) modulation generation based on silicon-on-insulator coupled-resonator optical waveguides (CROWs) capable of operating at wide bandwidth with enhanced sideband suppression. The optimum order of the CROW filter was synthesized based on comprehensive performance analysis including optical sideband suppression and electrical power variation. Experimental results demonstrate an OSSB signal with sideband suppression as large as 23 dB. The performance of the proposed OSSB was demonstrated via compensating radio frequency (RF) power degradation in the transmission of the RF signal within the fiber.
Highlights
Microwave photonics, which brings together the worlds of radiofrequency engineering and optoelectronics, has led to an ever-increasing interest in its use for the generation, processing, control, and distribution of microwave and millimeter-wave signals.[1,2,3,4] In microwave photonic systems, optical single-sideband (OSSB) modulation is often required for applications, such as radio-over-fiber transmission, photonic controlled phased array antenna, microwave photonic phase shifter, and optical vector network analyzer.[5,6,7,8] Heretofore, various approaches have been presented to generate OSSB modulation
We propose and demonstrate a novel OSSB modulation generation based on a compact high-order integrated SOI coupled-resonator optical waveguides (CROWs) filter
In the proposed OSSB modulation generation, a high-order bandpass filter based on CROWs is utilized to select the optical carrier and one of the sidebands of an optical double sideband (ODSB) signal
Summary
Microwave photonics, which brings together the worlds of radiofrequency engineering and optoelectronics, has led to an ever-increasing interest in its use for the generation, processing, control, and distribution of microwave and millimeter-wave signals.[1,2,3,4] In microwave photonic systems, optical single-sideband (OSSB) modulation is often required for applications, such as radio-over-fiber transmission, photonic controlled phased array antenna, microwave photonic phase shifter, and optical vector network analyzer.[5,6,7,8] Heretofore, various approaches have been presented to generate OSSB modulation. One method is by means of π∕2-phase shift via hybrid coupler in a dual-input Mach–Zehnder modulator or polarization modulator[9,10] or via optical Hilbert transformer.[11,12] A design with an optical fiber Sagnac loop and dual-electrode traveling wave modulator was demonstrated to achieve OSSB modulation where the modulated bandwidth was mainly limited by the hybrid radio frequency (RF) coupler.[13] Another way to generate OSSB signals is based on the usage of optical filtering to eliminate one of the optical sidebands in an intensity modulation or phase modulation scheme. Experimental results show an optimum OSSB modulation generation with sideband suppression over 23 dB and RF power ripple around Æ1 dB for wideband transmission of RF signals in a dispersive medium with a group delay slope of þ330 ps∕nm
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