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We propose a spectrum defragmentation system using maximum ratio combining in wavelength diversity digital coherent transmission. We evaluate the maximum ratio combining characteristics and experimentally show hitless defragmentation of a 128-Gb/s PDM-QPSK signal.
We experimentally demonstrate a novel coherent optical packet switching architecture for data center networks. This architecture uses coherent polarization-division multiplexed QPSK modulation to increase the capacity and relies on self-homodyne transmission for automatic tuning of the receiver LO. Information bearing packets and pilot tone signals are routed thought separated arrayed wavelength gratings...
A 20Gb/s Transimpedance Amplifier (TIA) is implemented in 65nm CMOS process using input-serial-peaking technique. Measurement results show that the hybrid integrated TIA with PD achieves up to 20Gb/s clean optical-diagram, with 4.3ps RMS-jitter, consuming 7.2mW.
We propose a channel-reuse, long-reach WDM-PON scheme and an optical beat noise-based automatic wavelength management method. A 40 km reach, channel-reuse, 40 Gb/s/λ downstream and 10 Gb/s/λ upstream signal transmission on a 100 GHz WDM grid is demonstrated.
We present an optimal fair power allocation and receiver combination scheme for multiuser indoor visible light communication systems using CDMA. MIMO diversity is achieved by using multiple LEDS and photodetectors with different orientations, resulting in a greater than 3 dB power advantage compared with MISO schemes.
We consider the visible light communication in extremely weak illumination environment. The system consists of an LED transmitter and a photomultiplier tube (PMT) receiver. We also show the bit-error rate (BER) of the signal detection.
We propose a Viterbi-type trellis-search algorithm to implement the FSO photon-counting sequence receiver proposed in [1] more efficiently and a selective-store strategy to overcome the error floor problem observed therein. The simulation results show that the performance can be improved significantly by our implementation method.
We develop an optical transceiver module with multi-rates and regeneration functionality, which can operate at any rate from 100Mb/s to 10.709Gb/s. Its input signal VIN-p-p, differential output VD-p-p and recovered differential clock VC-p-p are 11∼1000mV, 480∼660mV and 400∼580mV, respectively.
We report the experimental demonstrations of direct detection 12.5/25 Gb/s single sideband Nyquist pulse-shaped QPSK/16-QAM subcarrier modulation, generated using a dual-drive Mach-Zehnder modulator. Utilizing electronic pre-distortion, transmission over 1614/484km of standard SMF was achieved.
A photonic demultiplexer for radio frequency orbital angular momentum (OAM) signals is proposed and experimentally demonstrated based on an optical fiber loop. RF signals at frequency of 10GHz with OAM topological charges of 0, 1 and 2 are successfully recovered with sidemode suppression ratio of ∼20dB.
One of polarization diversity techniques in offset-frequency-spaced two-tone optical coherent detection scheme for radio-over-fiber systems is investigated. A combination of constellations recovered from two orthogonal-polarization components is proposed and the diversity effect is experimentally demonstrated.
In this paper, we propose a burst-mode EDFA for 40-Gb/s TWDM-PON supporting 100-km reach with 50-dB loss budget. Backward laser injection using a low-cost Fabry-Perot laser suppresses the burst surge whilst achieving low noise figure.
A TCM-based WDM-PON using a single RSOA is proposed to improve the cost-effectiveness in highly asymmetric traffic conditions and its feasibility is experimentally demonstrated. It reduces component count and increases sensitivity for downstream signals, yet meets the bandwidth requirement.
A new channelized receiver based on a double column microring array (DCMA) in a single laser structure is presented. An example of a microwave photonic channelized receiver with 500MHz channelization bandwidth is presented based on a DCMA consisting of three rings on each column. Performance investigation shows that the receiver with a channel spacing of 1GHz is able to offer a crosstalk lower than...
We experimentally evaluate flex-grid network upgrade scenarios, employing variable data rates and modulation formats and show that optical channel power should be assigned with knowledge of existing neighboring traffic to achieve best performance in WDM transmission.
We propose optical 8D time-polarization modulation using square-QAM-constellation and a simple decoding algorithm. Experiments show that the proposed modulation format can achieve significant gain and the decoding algorithm has the same performance as conventional maximum-likelihood-detection.
We experimentally demonstrate Nyquist superchannel transmission of 515Gb/s (8×64.4Gb/s) PDM-128QAM over single span of 120 km SSMF, using backward Raman amplification at the receiver-side. We achieve a record distance of unrepeatered transmission for the spectral efficiency (SE) as high as 10.31b/s/Hz.
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