Analytical and experimental data are presented for a broadband (1–18 GHz) microwave photonic link featuring a novel linearized modulator. Because the input RF signal need only be applied to this linearized modulator's single set of electrodes, it suppresses nonlinear distortion across an inherently broad bandwidth.
Plasmonic organic hybrid modulators ecently demonstrated ultrafast operation (>100 GHz), with ultra-compact footprints (10s μm2) and ultra-low power consumption (10s fJ/bit). We discuss the potential of the plasmonic platform for microwave photonics applications, with emphasis on mm-wave and sub-THz wireless communications and signal processing.
1.026-THz signal generated by an optical frequency comb generator is evaluated on its phase noise characteristics. A multi-level signal transmission by a photonics-based 1-THz radio transmitter is also evaluated with QPSK and 16QAM signals designed for uplink in the LTE mobile communications.
We demonstrate an optoelectronic oscillator (OEO) tunable from 15 to 20 GHz in which the optically carried microwave signal is generated by two distributed feedback (DFB) lasers on the same InP chip. Tunability is obtained by adjusting, thanks to the two bias currents, the optical frequency separation between the DFB laser tones. Phase noise reduction is obtained by combining optical self-injection...
We demonstrate a novel all-fiber repetition-rate stabilization method of mode-locked lasers. The method is based on an all-fiber Michelson interferometer with a km-scale fiber delay line. By stabilizing the laser to a 7-km-long fiber delay, the absolute integrated rms timing jitter of mode-locked Er-fiber laser is suppressed from 10 ps to 6.5 fs over 1 s. The absolute frequency instability (Allan...
Microwave photonic radiators provide wide bandwidths and high powers at mm-wave frequencies that can be utilized in extremely high throughput wireless communications, and high resolution millimeter wave imaging systems where their rugged, compact designs enable integration into large scale millimeter wave phased arrays. This work presents the design, implementation and measurement of a millimeter...
We propose a novel 60-GHz compact antenna module integrated with photodiode. The module is actually designed and fabricated, and it is successfully demonstrated that the antenna beams of 1×8 and 2×4 arrayed modules can be remotely controlled by tuning wavelength of 60-GHz RoF signals.
A microwave photonic link based on optical orthogonal modulation and coherent detection with digital phase noise cancellation for 2×2 MIMO is proposed and experimentally demonstrated. Error-free transmission of two QPSK microwave vector signals at an identical center frequency over a single-mode fiber is experimental demonstrated.
A novel optical vector network analyzer (OVNA) system based on silicon-on-insulator integrated optical bandpass filter is presented, which improves measurement accuracy in both magnitude and phase responses due to higher resolution and sideband suppression ratio offered by the new OVNA system.
We report on a novel implementation of a photonics-based RF interference mitigation system which is capable of suppressing same-frequency interference from a known signal at least 40 dB stronger than the signal-of-interest. Our technique will be valuable in future simultaneous transmit and receive (STAR) systems.
We present efficient mobile fronthaul systems for simultaneous transmission of radio signals in the microwave and millimeter-wave bands over fiber links. We compare the performance for signal transmission over intermediate frequency over fiber systems using an electrical and optical up-conversion to the MMW band at remote sites. We experimentally confirm the successful transmission of an LTE-A signal...
The “rainbow” spectrum analyzer is a 20 GHz instantaneous bandwidth RF spectral analyzer with 10 μs-resolution. We derive a model in order to optimize this analyzer and estimate the dynamic range. An experimental validation is presented. The dynamic range is estimated to be larger than 75 dB.
Signals hiding amongst a high level of noise present both basic and practical detection challenges. These challenges become significantly worse when the signal is transient, eliminating standard averaging techniques. The use of optical frequency combs to circumvent these detection challenges is discussed.
We present here photonics-based field visualization systems for the millimeter-waves and THz waves. Synchronized coherent measurement system reveals several unique phenomena such as wavefront conversion by a metal hole array. Asynchronized measurement system enables us to visualize the amplitude and relative phase distribution of electromagnetic waves emitted from on-chip antenna devices in which...
We present the field-trial results of a photonics-based radio-frequency scanning receiver demonstrator for electronic support measures (ESM). Typical complex electromagnetic operative scenarios are emulated and correctly acquired, confirming the previously tested laboratory performance of the proposed system, and its promising suitability for actual ESM applications.
We present a RF frequency down-conversion scheme using a switching mode uni-travelling-carrier (UTC) photodiode. This approach has the potential to achieve good conversion linearity and is suitable for photonic integration.
We demonstrate a flexible RF photonics down-converter that enables spectral folding of a 2–18 GHz RF band into a common 2 GHz wide IF band. When configured to selective down-conversion mode, we measure a sensitivity of −39.5 dBm and an SFDR of 106 dB Hz2/3.
We propose a novel RF photonic modulator that Is based on a coupled dual-cavity resonator. We show that such a coupled cavity system can perform efficient RF-to-optical signal conversion, in one example with more than 30 dB improvement over a single-cavity resonant modulator.
We present a conceptual microwave photonics radar architecture with programmable central-frequency and tailorable bandwidth. It is a coherent system. Generation of linearly chirped waveforms and Reception of theirs echoes are implemented via the same mode-locked laser. Photonic time-stretch sampling is used to alleviate electronic processing.
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