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Recent Progress on Real-Time DSP for Direct Detection Optical OFDM Transceivers
Recent Progress Real-Time DSP Direct Detection Optical OFDM Transceivers
2011/5/20
We describe recent developments in real-time digital signal processing for direct detection optical OFDM transceivers, including the optimization of high throughput FFT algorithms and receiver synchro...
100 Gb/s Photoreceivers for Coherent and Direct Detection
100 Gb/s Photoreceivers Coherent Direct Detection
2011/5/20
Photoreceivers for coherent and direct detection of 100 Gb/s data rates, consisting either of 90° optical hybrids integrated with pairs of balanced detectors forming coherent QPSK photoreceiver OEICs,...
Optical Biasing in Direct Detection Optical-OFDM for Improving Receiver Sensitivity
Fiber optics communications Modulation
2010/6/4
We show that replacing of electrical by an optical biasing minimizes the nonlinearity effect of an optical modulator. This allows the amplitude of the driving signal to be increased which increases th...
A Novel Optical Direct-Detection I/Q Up-Conversion with I/Q Imbalance Compensation via Gram-Schmidt Orthogonalization Procedure
Novel Optical I/Q Imbalance Compensation Gram-Schmidt Orthogonalization Procedure
2009/7/20
We proposed RF detect-detection vector signal generation using optical I/Q up-conversion. The Gram–Schmidt orthogonalization procedure is employed to compensate I/Q imbalance. After transmission over ...
Nonlinear Behaviour of 112 Gb/s Polarisation-Multiplexed RZ-DQPSK with Direct Detection in a 630 km Field Trial
Nonlinear Behaviour Polarisation-Multiplexed RZ-DQPSK Direct Detection Field Trial
2009/7/15
PM-RZ-DQPSK with direct detection and fast optical polarisation tracking achieves 6dB noise margin over a long-haul field link. The crosstalk by 10&40G OOK channels at 50GHz spacing is analysed for hi...
Reduced Complexity Precoding Based Peak-to-Average Power Ratio Reduction Applied to Optical Direct-Detection OFDM
Complexity Precoding Power Ratio Optical Direct-Detection OFDM
2008/8/4
DCT based precoding is proposed for PAPR reduction to improve the performance of optical OFDM at limited precoding complexity. Effective PAPR reduction and the resultant OSNR performance are shown.
PMD and PDL Tolerance of Polarization Division Multiplexed Signals with Direct Detection
PMD PDL Tolerance Polarization Division Multiplexed Signals Direct Detection
2008/8/3
The PMD tolerance of a polarization-division-multiplexed signal with direct detection depends on the signal bandwidth and time alignment between channels, and PDL impairments are affected by the polar...
Experimental Demonstration of Optical Colorless Direct-Detection OFDM Signals with 16- and 64-QAM Formats beyond 15 Gb/s
Optical Colorless Direct-Detection OFDM Signals Formats beyond
2008/7/30
Both highly spectral-efficient direct-detection 15-Gb/s 64-QAM and 20-Gb/s 16-QAM OFDM signals are demonstrated. Negligible penalty is observed following 25-km SMF transmission.