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We demonstrate that our recently proposed chirp measurement technique can be applied to the measurement and visualization of the small-signal dynamic chirp characteristics of modulators in vector space for the first time. Both discrete modulators and those integrated in externally modulated laser modules can be characterized by this method. The results agree with existing method to the first order...
We experimentally evaluate the time-varying crosstalk frequency response of a multicore fiber. Our findings suggest that dynamically adaptive transmission would be able to exploit this behavior, to improve the performance of crosstalk-limited links.
In this paper, we present a photonic wireless system operating in the W-Band (75–110 GHz) featuring ultra-high bandwidth as well as simple NRZ-OOK modulation format. By using a cascaded optical RF and data modulation approach on the transmitter side, flexible adjustment of the wireless RF carrier in the W-Band is achieved, while direct electrical to optical conversion with advanced photonic components...
Chirp characteristics of a comb signal generated by a Mach-Zehnder-modulator-based flat comb generator with an optical feedback loop were investigated. It was found that the comb source is suitable for pulse generation.
This presentation focuses on high-speed frequency control of radio-wave and lightwave signals using optical modulation. Frequency multiplication in optical modulators also plays important roles. Optical two-tone signals whose frequency separation can be up to 160 GHz would be useful for reference signals in array antennas, photodetector estimation, etc. In addition, this technique can be applicable...
This presentation will discuss optical signal processing techniques for high-speed modulation of millimeter-wave, which can provide high-speed wireless transmission of 40Gb/s. Pure optical two-tone signals can be converted into millimeter-wave signals by using high-speed photodetectors.
This paper describes recent progress of high-speed lithium niobate (LN) modulator technologies for advanced modulation formats. Integrated devices can synthesize multi-level lighwave signals in photonic circuits. Precise and high-speed modulation also plays important roles in broadband wireless transmission.
We describe ultra wideband frequency control of millimetre-wave and lightwave signals using optical single-sideband modulation. Precise and rapid frequency control can be achieved by digital arbitrary waveform generation and high-speed electro-optic modulation. Frequency multiplication in optical modulators also plays important roles. Ultra-wideband frequency chirp signals from 9.6 GHz to 16 GHz,...
We describe a characterization technique for electro-optic (EO) and optical-electric (OE) conversion devices, by using pure two-tone optical signal generation by using precise and high-speed modulation. A Mach-Zehnder modulator (MZM) provides precise and high-speed lightwave control as an EO conversion device, so that it would be good candidate for a reference signal source for conversion efficiency...
We demonstrated broadband comb generation using a Mach-Zehnder-modulator-based flat comb generator with a feedback loop. By constructing the feedback loop, the modulation depth was increased. A generated comb signal was broadened as compared with single-path configuration.
We present lightwave modulation techniques for high-speed signal generation in digital and analogue applications. Advanced modulation formats, such as differential quadrature phase-shift-keying, amplitude- and phase-shift-keying, quadrature-amplitude-modulation etc, were investigated to obtain enhanced spectral efficiency, where Mach-Zehnder modulators (MZMs) are commonly used to control optical amplitude...
A wideband transmittance/reflectivity measurement system for fine-structured components is proposed. The optical single-sideband frequency sweeper with an ultra wideband Hilbert transformer enables excellent frequency sweep range between 2GHz-30GHz. Frequency resolution of 4.7MHz is experimentally obtained.
We proposed a stable and agile picosecond pulse generator using a single-stage conventional Mach-Zehnder modulator that generates ultra-flat frequency comb. 10-GHz 2.9-ps pulse trains were generated with a timing jitter of less than 130 fs.
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