In this paper, a bias-free silicon optical single-sideband (OSSB) modulator without 2 nd-order sideband is proposed and theoretically investigated. The proposed modulator is based on a dual-drive Mach-Zehnder modulator (DDMZM) and silicon photonics platform. In the proposed structure, a piece of silicon waveguide is used in one of the arms of the unbalanced DDMZM which acts as a bias for the modulator. So, the operating point of the modulator can be tuned by adjusting the optical wavelength. Analytical models for all the components in the structure are derived and closed-form expressions are found for optical transmission, optical spectrum, etc. Modulator nonlinear behavior under small and large signal modulation is discussed. Conditions on the optical wavelength to have an OSSB modulated signal with/without 2 nd-order sideband are found. It has also shown that optical carrier-to-sideband ratio (OCSR) can be tuned by adjusting the applied voltage. By proper adjusting the applied voltage, suppressed carrier or equal carrier to the first sideband can be obtained in OSSB modulator without 2 nd-order sideband. Analytical results are verified by simulations and previously reported measurement data. The proposed analytical model is a general model that can be used for any nonlinear electro-optic modulators such as phase and absorption modulators.
A novel reconfigurable Microwave Photonics (MWP) mixer is presented in this paper, which can be configured to work as a frequency hopper, ASK modulator and phase shifter. This mixer is based on a cascaded Mach–Zehnder Modulator (MZM) structure. A general nonlinear analytical model for the structure is presented. This model is platform free, which means it can be applied to several MWP and integrated MWP platforms. Based on the analytical model, the performance of the structure and output results, such as the optical and electrical spectrum of the structure, are derived in mathematical closed-form expressions. The results of the presented analytical model are compared and evaluated with the results obtained from the simulation to prove the correctness of the analytical model. The presented structure has a simple form, which can be fabricated at a low cost. In addition, according to the obtained results from the analytical model, there is no need to change the arrangement of the structure to operate in any of the mentioned configurations, and the desired function is achievable only by changing the bias voltage of the modulators at the desired frequency.
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