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Coherent optical receivers have been widely used in free-space optical communication. We report on a coherent receiver with a homodyne optical phase-locked loop using a Costas loop. Differing from the conventional configuration, the demonstration in this paper with enhanced dynamic performance using an auxiliary acquisition and locking circuitry is able to achieve fast phase locking to signal laser...
In this paper, a free-space optical (FSO) communication system with supercontinuum source generated by dispersion shift fiber (DSF) from pulsed light modulated by optical switches is designed and constructed. In addition, the experimental results of free-space optical communication between broadband and narrowband light source are compared. Verifying the feasibility of broad-spectrum FSO communication...
The wavefront compensation effect of the micro corner-cube-reflector arrays (MCCRAs) in modulating retroreflector (MRR) free-space optical (FSO) link is investigated by wave-optics (WO) simulation method that is based on the split-step beam propagation method and phase screen theory. Two kinds of the MCCRAs with the cell's apertures of the triangle and hexagon are considered with the aid of the numerical...
In this paper, we propose a block decision-aided (BL-DA) laser phase noise (LPN) estimation algorithm for coherent optical OFDM (CO-OFDM) systems. The OFDM symbols are divided into several blocks and the LPN estimation and compensation procedure is performed based on the decisions between these blocks. The proposed BL-DA algorithm can be applied for higher LPN estimation while at the same time ensuring...
A cooperative system for visible light positioning (VLP) and visible light communication (VLC) is proposed based on the spread-spectrum plugin of optical identification (OPID). By keeping the existing VLC frame structure untouched, two different implementation schemes were designed by adding the location information field into the communication information field for VLP applications. It is deemed...
Pluggable optics can potentiallly fuel the optical transport network in a more efficient and manageable manner. To enable this revolutionary packet-optical engine, integrated photonics seems to be the only possible solution. We introduce the latest industry trend of pluggable optical module form factors, and review the latest progress and challenges of pluggable optics products. Furthermore, we discuss...
A multiwavelength random fiber laser based on stimulated Brillouin scattering (SBS) with odd and even order Stokes output separated is proposed and demonstrated experimentally. The gain is provided by the SBS and erbium doped fiber amplifier, while the Rayleigh scattering in single mode fiber (SMF) provides random distributed feedback. With a two-branch structure, we successfully make the laser output...
An all-optical multilevel amplitude regenerator is optimized based on the transmission response of a nonlinear optical loop mirror (NOLM). Three regenerative regions defined by the power-transfer-function (PTF) slope of less than 1 are obtained, and noise suppression is shown for a PAM4 signal. Using amplitude dithering we were able to experimentally characterize the transfer function slope and confirm...
In this paper, we present a monolithic vertical integration of a 850nm wavelength AlGaAs/GaAs-based vertical-cavity surface-emitting laser (VCSEL) and a 810nm wavelength AlGaAs/GaAs-based resonant cavity enhanced photodetector(RCE-PD). The receiving and transmitting of optical signals on two different wavelengths can be realized simultaneously by the single transceiving chip. Simulations show that,...
In this paper we demonstrate the 4 level pulse amplitude modulation (PAM-4) signal generation through a silicon Mach-Zehnder modulator. The baud speed of the PAM-4 signal generation is characterized up to 32 Gbaud (64Gb/s). And we have measured the device's bit error rate (BER) up to 32 Gbaud and the spurious free dynamic range (SFDR) of the distortion component of the modulated light.
Network Virtualization (NV) realizes the decoupling of network infrastructure and network services. With the emergence of the Software Defined Network (SDN), it is easier to implement NV supporting dynamic heterogeneous underlay network. In this paper, we present and experimentally validate an Optical Network Virtualization (ONV) architecture based on OpenVirteX (OVX) supporting bandwidth on demand...
Single event effect susceptibility of industrial MCUs and key drive chips of several commercial transceivers are studied based on heavy ions and pulse laser methods. Based on the testing results, the performance of receive chips are better than transmit chips or transceiver chips, and the threshold values of transmit chips or transceiver chips are between 30 and 37MeV.cm2/mg. However, the MCUs are...
In this paper, wavelength division multiplexing and space division multiplexing (WDM-SDM) passive optical access network employing multi-core fiber (MCF) and self-homodyne detection is proposed. 4×56-Gb/s PDM-16QAM-OFDM transmission is realized over 10-km 7-core fiber with simplified digital signal processing.
In this paper, a 60cm free-space optical card-to-card wavelength division multiplexing (WDM) transmission architecture using OFDM modulation and coherent detection is proposed and demonstrated, which can offer flexibility and high speed transmission simultaneously. The experimental results show that the net data rate is up to 106.9Gb/s and the receiver sensitivity is −34dBm at the BER threshold of...
The growing data traffic in the local area networks (LAN) is driving development of the cost-effective transmission systems. In this paper, we investigate the influence of a semiconductor optical amplifier (SOA) on the transmission system of 60 km standard single-mode fiber (SSMF) in the 1310 nm wavelength-division-multiplexed (WDM) system. We investigate the SOA performance and analyze the receiver...
In this paper, we propose a novel sampling frequency offset estimation algorithm to improve the performance of the practical intensity-modulation and direction-detection (IMDD)-based OFDM system. For this scheme, only OFDM symbol is used, which reduce the complexity of implement in practical system. And, by taking the relationship of phase rotating of subcarriers into account, we successfully estimate...
In this paper, a solar panel utilized as a photodetector with simultaneous energy harvesting is proposed in visible light communication (VLC). The solar cell is a self-styled passive device, which can convert optical signals into electrical signals. The generated energy can potentially be used to power user terminals or at least to prolong operation time. This work is an important step towards the...
We experimentally demonstrate the high-speed free-space optical (FSO) transmission over 1 km using 20 Gbit/s advanced coherent quadrature phase-shift keying (QPSK) signals. The constellation diagram and the bit error rate (BER) are measured. The receiving sensitivity of the FSO transmission is about −23.9 dBm at the BER of 3.3×10−3.
For metro applications, direct detection offers the advantages of low cost and low complexity. Discrete multi-tone (DMT) is a promising format due to its high spectral efficiency, flexibility and tolerance to chromatic dispersion (CD). In this work, single-side-band-DMT (SSB-DMT) and tuneable electrical dispersion compensation double side-band-DMT (TEDC-DSB-DMT) are summarized and compared.
Spectral phase coding by using 0/π-phase-shift and ±π/2-phase-shift are thoroughly studied. The security vulnerability and improvement are analysed by evaluating the encoded signal. ίπ/2-phase-shift spectral phase coding can guarantee the security by hiding the optical code in the encoded signal. In addition, coding performance of both spectral phase coding techniques is investigated by measuring...
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