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This paper demonstrates a push-pull traveling-wave Mach-Zehnder modulator on InP which operates up to 50Gb/s in C band optical transmission system. This MZM could potentially be integrated to form the IQ modulators, Dual IQ modulators and PM-IQ modulators to achieve higher operating speed.
A low-frequency electrical spectrum analysis method is researched for evaluating broadband characteristics of high-speed dual-parallel Mach-Zehnder modulators (DPMZMs) based on dual-frequency modulation and fixed-frequency bias. The method enables the broadband and high-resolution evaluation for the modulation depth and half-wave voltage of a high-speed DPMZM by using a low-frequency photodetector...
A distributed feedback semiconductor optical amplifier (DFB-SOA) based optical vector network analyzer (OVNA) is proposed. The proposed OVNA is realized by mapping the transmission response of the optical device under test (ODUT) into electrical domain. The key principle of the OVNA is the optical carrier recovery resulted by the DFB-SOA. Using the proposed OVNA, the transmission spectrum of an optical...
Real-time THz-wave wireless OFDM communication, which is assisted by optical technology, is reported. A 4 × 10 Gbit/s THz-wave OFDM signal is transferred into an optical OFDM signal, and the optical OFDM signal is successfully demultiplexed into four sub-carrier channels with an integrated-optic DFT circuit.
A phase-shift Assisted OFDM-RoF system employing optical heterodyning is proposed and experimentally demonstrated. By using the phase shift of optical signal to represent the sign data of the OFDM signal, a significant improvement of the power efficiency can be obtained compared to the conventional DCO-OFDM. 10GHz/1.8Gbps 4QAM PSA-OFDM RoF transmission over 10km SMF and 2m wireless is experimentally...
An on-wafer and self-calibrated scheme is proposed and demonstrated for self-referenced microwave characterization of a silicon integrated optical transceiver. The proposed self-calibration method enables on-wafer selective extraction of microwave characteristic parameters of high-speed modulators and photodiodes in the integrated optical transceiver, without the need for extra electrical-to-optical...
We present channel multiplexing with a single optical intensity modulator by incorporating tandem optical single-sideband modulation and orthogonal multiplexing technique with DSP-assisted coherent detection. Quality factor above 6 is demonstrated experimentally for all BPSK channels.
A novel photonic approach to the implementation of RF photonic phase shifter is proposed. It is based on a polarization dependent optical phase modulator and a dual-parallel Mach-Zehnder modulator. The phase shift of RF signal has a predefined linear relationship with the dc bias voltage of the optical phase modulator. This enables users to easily determine the control voltage needed to realize the...
A simple and effective technique to realise optical single sideband modulation in a very wide RF/microwave frequency range is presented. It uses low-cost off-the-shelf components to realise single sideband modulation with a large sideband suppression ratio. Experimental results demonstrate single sideband modulation with more than 30 dB unwanted sideband suppression in a wide 2–40 GHz frequency range.
We report on the fiber-optic polarization-intensive optical modulator architecture by transferring Al/HfO2/ITO/ HfO2 stack around the core region of the D-fiber. The proposed modulator is capable of offering extinction ratio (ER) as high as 23.71 dB and insertion loss (IL) as low as 1.01 dB for the transverse electric (TE) mode. Concurrently, for transverse magnetic (TM) mode are 23.93 dB and 1.07...
RF self-interference cancellation for Full-Duplex communication with a microwave photonic technique is proposed and demonstrated experimentally. It is based on an integrated dual-parallel Mach-Zehnder modulator (DP-MZM), where the sub-MZMs (MZM1 and MZM2) are biased at the quadrature point and the minimum point, respectively. It avoids the optical interference at the combining Y branch waveguide....
We report a fully integrated microwave photonic passband filter on a silicon photonic chip. The on-chip integrated microwave photonic filter (IMPF) consists of a high-speed phase modulator (PM), a thermally tunable high-Q micro-disk resonator (MDR), and a high-speed photodetector (PD). The bandpass filtering function of the IMPF is implemented based on phase modulation and phase-modulation to intensity-modulation...
We propose a novel scheme using a microring resonator (MRR) structure in silicon photonics (SiP) for the elimination of signal-to-signal beat interference (SSBI) in a direct detection, optical orthogonal frequency division multiplexing (DDO-OFDM) system. Unlike other SSBI cancellation techniques, SiP-based MRR shows unique advantages such as compactness and low cost. We examine performance as a function...
An electro-optic chaos generator is proposed based on phase modulation to intensity modulation conversion and an analog-digital hybrid feedback loop. The analog part takes the digital sequences from shift registers as input and converts them into analog noise like signal, from which new bits are determined. The effective bandwidth and complexity of the output analog signal can reach a high level with...
In this article, we propose the generation of a microwave signal through a VCSEL Based Optoelectronic Oscillator (VBO) for free space communication applications. This system is implemented using VCSELs in the O-band and C-band. The signals generated at 1.25 GHz and 2.49 GHz are used to produce experimentally Return-to-Zero On Off Keying (RZ-OOK) and Return-to-Zero Differential Phase Shift Keying (RZ-DPSK)...
A novel optically tunable frequency-multiplying optoelectronic oscillator (OEO) to generate a high frequency microwave signal without employing an optical filter is proposed. The upper dual parallel Mach-Zehnder modulator (DP-MZM) integrated in a dual-polarization quadrature phase shift-keying (DP-QPSK) modulator is accurately biased to serve as an equivalent phase modulator (e-PM), which functions...
A frequency-multiplying radio frequency (RF) source based on the optoelectronic oscillator (OEO) with low phase noise has been proposed and experimentally demonstrated. With the optical carrier suppression process, the frequency quadrupling can be achieved by biasing the intensity modulators at the minimum transmission point simultaneously inside and outside the OEO loop. In the proof-of-concept experiment,...
A new method of microwave photonic filter (MPF) with widely tunable passband is proposed and experimentally proved by using an optical-injected Fabry-Perot laser diode. It is based on the basic principle that the FP laser wavelength selectively amplified under optical injection. By applying the optical wave from a tunable-laser source (TLS) to the PM, a phase modulated optical signal is generated,...
We offer a proof-of-concept experiment for reducing effects of second and third order intermodulation and second harmonic distortions in multi-carrier optical transmission. Experimental results with feed-forward optical compensation show little dependence on the amount of distortion terms, achieving 5 dB improvement in the EVM distortion floor level. The limiting trade-off between compensating for...
We proposed and demonstrated a novel photonic and digital hybrid flexible satellite payload with resources sharing for multi-channel communication payloads at L, S, Ku and Ka band. The system uses microwave photonic up/down conversion to realize receive different band microwave signals and convert to fixed IF frequency. We further show that the photonic and digital hybrid switching is used compared...
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