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In this paper, we present a novel multiplexed optical interrogator for remote length measurement based on Low Coherence Interferometry. This technique exploits the benefits of Microwave Photonics to increase considerably the optical path difference (OPD) range and the system sensitivity compared to previous contributions.
This work reports the performance of a wireless transmission link based on a radio access unit (RAU) implemented in photonic integrated circuit (PIC) form. The PIC contains a high speed photodiode for direct optical to RF conversion, monolithically integrated with a semiconductor laser, used as an optical local oscillator for up-conversion of the incoming 16-QAM-OFDM signal through heterodyning. Wireless...
We report a photonic chip comprising multiple colliding pulse mode-locked laser and delay line-assisted Mach-Zehnder interleaver to generate 350GHz wave signal. With this mode-locked laser fourth harmonics are obtained. The interleaver quadruples the repetition rate. An integrated phase modulator enables wavelength tuning up to 0.03nm.
The lowest phase noise microwave signals are now produced by photonic methods. This talk will describe some of these methods, with special attention given to optical frequency division.
We demonstrate high speed and high power evanescently-coupled waveguide modified uni-traveling-carrier photodiodes. These devices achieved 70 GHz bandwidth and as high as 7.8 dBm RF output power at 60 GHz.
We investigate the use of an ultra-shallow partial etch to form silicon microring resonators with high Q in a 250nm thick SOI device layer, to enable narrowband filters for RF photonic signal processing in conventional silicon photonics platforms. We demonstrate compact ring resonators formed by waveguides with as shallow as 25nm deep etches in a 250nm device layer and show significant improvement...
We propose and demonstrate a coupled optoelectronic oscillator (COEO) based on enhanced spatial hole burning (SHB) effect in an unpumped erbium-doped fiber (EDF). A novel structure is designed to form strong standing waves in the unpumped EDF, which enables large SHB effect to improve the side-mode suppression and ensure stable operation. A proof-of-concept experiment is carried out. A 10-GHz stable...
We demonstrate a microwave photonic Interference canceller with a balanced architecture capable of relative-intensity noise suppression. Experimental results show that the system can cancel > 25 dB interference over 200 MHz instantaneous bandwidth and tune over a frequency range of 2–8 GHz.
We report a heterogeneous multicore fiber design optimized in terms of slope dispersion and crosstalk for true time delay operation. The reduction of the higher-order-dispersion nonlinearities improves the fiber performance as a group-indexvariable delay line for broadband radiofrequency signal processing.
New communication system for high-speed train passengers is required to provide broadband services in the train. Radio over fiber in millimeter wave band is considered to provide a high throughput of the system. As a proof of concept, we generate 92 GHz 200 M symbol/sec 64QAM signals by optical frequency doubler. EVM of the signal is 7.14%. The result shows 1.2Gbps transmission is available in MMW...
To simultaneously stabilize a series of terahertz (THz) source devices, we propose the use of optical combs as a frequency reference source. The optical combs provide a number of equally-spaced cw lights with high accuracy, so that it is suitable for generation of a series of frequency reference signals. To generate broadband optical combs, a combination of the Mach-Zehnder-modulator-based flat comb...
A photonic microwave image-reject and singlesideband mixer is proposed based on a dual-polarization dualdrive Mach-Zehnder modulator. Results show that the image- and sideband-reject ratios of the proposed IRM and SSM are larger than 60 and 30 dB, respectively, and the LO leakage is largely suppressed.
By the proposed algorithm with iterative methods, the post digital linearization technique converted the distorted RF signal into the linear one. Experimentally, more than 29dB suppression of IMD3 has been achieved and a spurious-free dynamic range increases from 104.1 to 128.8dB within a 1-Hz bandwidth.
A simple method for generating linearly chirped microwave waveforms (LCMWs) with ultra-large time-bandwidth product (TBWP) is proposed using an optically injected semiconductor laser. The generation of an LCMW with a TBWP as large as 1.2 × 105 (10 μs, 12 GHz) is demonstrated.
A tunable single-passband microwave photonic filter with ultra-high out-of-band rejection ratio is proposed. In experiments, a rejection ratio up to 55 dB is obtained for tunable single-passband MPF using single stage for the first time. Tunable central frequency, bandwidth, and spectral profile are demonstrated.
We experimentally compared 60 GHz RoF fronthaul links employing DSB-SC and OSSB. OSSB link offers better receiver sensitivity (−5 dBm) for 8-Gbps 16-QAM signal at BER=2.3e−3, while DSB-SC link has a lower receiver sensitivity (2.6 dBm) requiring lower frequency LO and smaller bandwidth MZMs.
A serial photonic digital-to-analog converter (PDAC) is proposed and demonstrated. The established 4-bit PDAC has a good linearity and the effective number of bits reaches 3.49. Based on the PDAC, the generation of cosine, triangular, sawtooth, parabolic and square waveforms is implemented with good performance.
This paper presents the impact of signal linewidth on photonic THz wireless systems using phase estimation (PE) algorithms at the receiver. The penalty associated with signal linewidth, as well as the optical linewidth requirements for systems using free-running lasers are evaluated using extensive Monte Carlo simulations for different modulation formats. The BER performance and power penalty induced...
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