Abstract
A novel approach to perform optical vector analysis (OVA) is proposed and experimentally demonstrated with carrier-shifted optical double-sideband (ODSB) modulation based on a dual-drive dual-parallel Mach-Zehnder modulator (DD-DPMZM). The proposed method has a doubled measurement range as compared with the conventional OVA based on optical single sideband modulation (OSSB), and a much simpler and more robust configuration as compared with the previously-reported ODSB-based OVA. In addition, the proposed scheme does not generate any undesirable spikes in the measurement results. The transmission response of a sampled fiber Bragg grating in a range of 80 GHz is measured with a resolution of less than 667 kHz by using 40-GHz microwave components. The influence of the unideal frequency-shifted optical carrier generation in the DD-DPMZM on the measurement error is also investigated.
Highlights
Optical vector analysis (OVA) is a technology to measure frequency responses, including magnitude, phase and polarization responses, of optical devices, which is essential for device fabrication and system design
Restricted by the low wavelength accuracy and stability of wavelength-swept laser sources, they have a relatively poor resolution, which is too low to extract the frequency responses of high-fineness optical devices, such as fiber Bragg gratings (FBGs) with a 3-dB bandwidth of 9 MHz [3] and high-Q optical resonators [4]
To overcome the above problems, we report in this paper a novel optical double-sideband (ODSB)-based OVA incorporating a dual-drive dual-parallel Mach-Zehnder modulator (DD-DPMZM)
Summary
Optical vector analysis (OVA) is a technology to measure frequency responses, including magnitude, phase and polarization responses, of optical devices, which is essential for device fabrication and system design. The optical vector analyzers are conventionally implemented based on modulation phase-shift approach [1] or interferometry method [2], which characterize the frequency responses by sweeping the wavelength of a wavelength-swept laser source. The key challenge of the OSSB-based OVA is to implement a high-performance OSSB modulator with a wide sweeping range, high linearity and large sideband suppression ratio (SSR) [9]. An OVA based on optical double-sideband (ODSB) modulation is proposed [17, 18], which characterizes the optical devices using both of the two first-order sidebands without frequency aliasing by shifting the frequency of the optical carrier. The residual sideband in the wavelength-fixed OSSB signal would influence on the measurement accuracy and the dynamic range, which is investigated and discussed in this paper
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