Complex-Coefficient Microwave Photonic Filter Based on Orthogonally Polarized Optical Single-Sideband Modulation

A complex-coefficient microwave photonic filter with continuous tunability is proposed and experimentally demonstrated. The filter taps are based on a 360° tunable microwave photonic phase shifter, which is realized by orthogonally polarized optical single-sideband (OSSB) modulation. The experimental results are shown and regarded as good performance for the proposed filter. The phase shift for the two taps covers a full 360° range from 8 GHz to 26 GHz. Frequency responses with different center frequency are measured within 20–21 GHz with the full free spectral ranges (FSRs) of 185 MHz and 285 MHz, respectively.

Transmission of 3D Holographic Information via Conventional Communication Channels and the Possibility of Multiplexing in the Implementation of 3D Hyperspectral Images

This paper shows the possibility of transmitting 3D holographic information in real time with a TV frame rate over conventional radio channels by transmitting two two-dimensional signals in two image modes: depth map and surface texture of the object (mask + texture). The authors point out that it is similar to compression through eliminating the carrier and it is inherently similar to SSB (single-sideband modulation) but has higher resolution ability in reconstructing 3D images. It is also shown that such technology for transmitting 3D holographic information is in good agreement with the tasks of both aggregating and multiplexing 3D images when they are transferred from one part of the electromagnetic spectrum of radiation to another and the creation of hyperspectral 3D images.

A photonic transmission link with enhanced dynamic range by incorporating phase shifters in dual drive dual parallel Mach–Zehnder modulator

A linearization scheme is proposed for microwave photonic link to enlarge spurious free dynamic range using a dual-electrode dual parallel Mach–Zehnder modulator (MZM). This scheme employs phase control method to improve performance of the link by adjusting phase of radio frequency (RF) signals and bias voltages of optical modulator. Optical single sideband modulation is achieved through sub-modulators of dual parallel MZM which increases efficiency of the link. The simulated results show that third order intermodulation distortion is suppressed by 28 dB when the input RF signals are 9.1 and 9.5 GHz and noise floor is at −161 dBm/Hz. The spurious free dynamic range is also improved by 12.6 dB.

Optoelectronic Oscillator for Arbitrary Microwave Waveform Generation

In this manuscript, to the best of our knowledge, we proposed the first optoelectronic oscillator (OEO) that can generate arbitrary microwave waveforms. A reconfigurable optical waveform generator is constructed via optical carrier-suppressed single-sideband modulation. The optical waveform from the generator can be seen as a series of frequency-scanning optical wavelengths in the frequency domain, and at any instant, the number of wavelengths can be from 0 to infinite. When the optical waveform serves as the optical source for an OEO based on the phase-modulation-to-intensity modulation conversion using a phase modulator cascaded with a phase-shifted fiber Bragg grating, a frequency-scanning microwave photonic filter with scanning characteristics according to the optical waveform is realized. By setting the period of the optical waveform or its multiple equal to the cavity round-trip time, a Fourier domain mode-locked (FDML) OEO that can generate arbitrary microwave waveform is realized. The key contribution of the work is that the concept of FDML OEO is further analyzed and extended to generate an arbitrary microwave waveform. Based on the proposed system, in addition to the single-frequency microwave signal and linearly-chirped microwave waveforms, low phase noise arbitrary microwave waveforms can be generated utilizing the low phase noise merit of an OEO.