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We propose, for the first time to our knowledge, the application of multicore fibers (MCFs) to the implementation of sampled optical delay lines for RF signals. Heterogeneous multicore fibers are addressed as a generic building block and discussion is then centered on the particular application of arbitrary waveform generation.
Here, we present novel high-power partially p-doped, partly non-intentionally doped absorbing double mushroom-type 1.55 μm waveguide photodiodes for integration in compact photonic transmitter modules employed in E-band (60–90 GHz) radio-over-fiber systems. Besides the high-output power levels approaching 0 dBm and a high linearity in the 70 GHz band, the developed photodiodes also exhibit an excellent...
A new high-speed high-power photodiode design based on beam-lead technology to reduce thermal resistance and series contact resistance, which limit the saturation photocurrent of photodiodes with small active area, has been presented.
We propose a converged radio over fiber and wavelength division multiplexing passive optical networks (WDM-PON) system compatible with wired and 60 GHz band wireless transmission by implementing two-band modulation with a single Mach-Zehnder modulator (MZM) behaving as parallel phase modulators. In this paper, the interference between RF and baseband modulations is theoretically and experimentally...
We demonstrate 300-GHz-band radio transmission with a digital coherent detection technique. Quadrature-phase-shift-keying modulation can provide a data rate of 29.9 Gb/s, with 7% forward error correction overhead. A frequency-locked optical frequency comb for a 300-GHz radio-over-fiber signal can be generated by a recirculating frequency shifter with a singlesideband suppressed-carrier modulator in...
We report a tuneable heterodyne photonic THz source, monolithically integrated on an InP chip. The system, locked to a comb generator, allows generation of high purity signals and is tuneable from 25 GHz to 1.6 THz. Continuous frequency sweeps of 300 MHz and tuneability between comb lines from 2 GHz to 6 GHz offset are demonstrated. Due to the photonic integration and small dimension, custom-made...
Optical frequency comb generators, when combined with line-by-line pulse shaping, allow for the synthesis of programmable microwave photonic phase filters. The filter's achievable time-bandwidth product is related to the number of comb lines that can be individually manipulated. In this contribution, we present a flat ultra-broad optical frequency comb generator based on external non-linear broadening...
A novel linearized photonic downconversion technique based on balanced detection and digital signal post-processing is proposed and experimentally demonstrated. The overall system performance benefits from carrier suppression operation and balanced detection. The dynamic ranges of both the X- and K-band links are also investigated. After compensated in the digital domain, the downconverted IMD3 components...
We demonstrate a novel approach to eliminate the second-order harmonic distortions (SHD) in radio over fiber (ROF) links utilizing a dual-output Mach-Zehnder modulator and balanced detection. Experimental results are presented for a 5GHz link exhibiting a 35.8dB suppression of the SHD and 5.89dB enhancement of the fundamental power, resulting in a significant improvement of 18dB in the second-order...
We present the first demonstration of a broadband and continuously tunable integrated optical true-time-delay line, operating over the complete DVB-S satellite communication band, realized with a CMOS-compatible TriPleXTM waveguide technology. The integrated optical chip includes a delay line and an optical sideband filter (OSBF) based on reconfigurable optical ring resonators (ORR). The filter and...
We design a cost-effective broadband radio over fiber (RoF) transceiver based on 1310 nm 10 GbE commercial off the shelf (COTS) optical components, with up to 4.3 GHz bandwidth. The suppression of 3rd intermodulation distortion (IMD3) is as high as 50dBc, and the spurious-free dynamic range (SFDR) of RoF links based on this transceiver reaches 85 dB/Hz2/3. An error vector magnitude (EVM) of 3% is...
A novel photonics approach to the characterization of instantaneous frequency and glitches of sweeping oscillators is proposed and demonstrated based on a PRBS frequency comb. The analog sweeps of a vector signal generator, whose sweeping ranges are 0.5 GHz to 2.5 GHz and 2.5 GHz to 5 GHz respectively, are calibrated using the proposed method, and the glitches of sweeping is also identified. The proposed...
We demonstrate a technique for electrooptically upconverting and phase modulating digital data onto an RF carrier and performing coherent detection and downconversion of the received millimeter-wave signal to baseband. The binary phase-shift keyed RF signal is transmitted wirelessly to show its potential in wireless applications.
An optical bistable switching device based on electrically coupled SOA-BJT in series is proposed and demonstrated. Switching speeds in MHz range are measured and is limited mainly by the parasitic capacitance and inductance of the SOA. A theoretical model based on the equivalent circuit is developed and simulation results indicate that GHz operation with current photonic integration technologies is...
We studied effects of fiber chromatic dispersions on radio over fiber systems using multi-wavelength tunable laser sources. A beam forming experiment of 2 GHz-band array antennas by controlling wavelengths of four light sources was conducted, where 5 km single-mode fiber and 3 nm wavelength tuning range yielded π phase shift of RF signals. We also studied transmission penalties due to the phase difference...
We introduce an efficient technique to optically generate millimeter-wave sources. The technique is based on the frequency multiplication concept using high order harmonics, generated by a Mach-Zehnder modulator, combined with the Brillouin selective side band amplification process in a high Q fiber ring resonator. We demonstrate the generation of a low phase noise 65.2 GHz signal with a power level...
We investigate and experimentally demonstrate an optical phase noise monitoring technique for non-return-to-zero differential-phase-shift keying (NRZ-DPSK) signals using the phase modulation detection. By applying this detection to optical phase noise (PN) monitoring, a 10-dB monitoring dynamic range is achieved when the OPEV varies from 500 to 850 (the corresponding phase modulator driving power...
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