A high-resolution optical vector analysis (OVA) based on optical single sideband (OSSB) modulation using a dual port Mach–Zehnder modulator (DP-MZM) is proposed and demonstrated. By using the DP-MZM, an OSSB modulation signal is generated. The generated OSSB signal is propagating through the device under test (DUT). After the optical-to-electrical conversion in photodetector (PD), a photocurrent carrying the frequency responses of the DUT is obtained. After signal processing, the photocurrent corresponding to the frequency component is extracted, and the frequency responses of DUT are measured with high-resolution in simulation. To eliminate the frequency response of the system, a calibration procedure is performed by removing the DUT. Compared to the traditional methods, the proposed OVA can be used to measure the frequency responses of high-quality optical devices with MHz-resolution over a large measurement range. By using the DP-MZM, the stability is improved, and the complexity is reduced. The proposed method is theoretically analyzed and verified by simulation. A simulation for measuring the frequency responses of the ideal phase-shifted fiber Bragg grating and the ideal Fabry–Perot cavity is carried out, the frequency responses in a range of 50 GHz are measured with a resolution of 1 MHz. The proposed method can be potentially applied in the field of characterization of integrated optoelectronic devices and future photonic systems.
We report an optical vector network analysis (OVNA) based on optical suppressed carrier double-sideband (DSB) modulation and the Pound Drever Hall (PDH) technique. In this novel scheme, the optical carrier suppressed DSB modulation signal propagates through the high Q optical device, and then the double frequency of the driven radio frequency signal is detected, by which the frequency responses of the device can be accurately achieved. Comparing with the common DSB-based OVNA, by biasing the modulator at the minimum transmission point (MITP), the accuracy improvement can be realized since the errors caused by the even-order sidebands are eliminated. Moreover, the high stability of the proposed OVNA can also be achieved by using the PDH technique. In the proof-of-concept experiment, the magnitude and phase responses of the Fabry-Perot (FP) interferometer are realized with high accuracy when the modulation index is small. There is no repeated frequency response even if the test time is up to 30 minutes. The proposed scheme provides a novel strategy for high-accuracy frequency responses measurement, which can be potentially used in high Q optical devices characterization.
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