A5070001296- Advanced Photonic Communication Systems
- Optical Network Technologies
- Photonic and Optical Devices
- Semiconductor Lasers and Optical Devices
- Advanced Optical Network Technologies
- Advanced Fiber Optic Sensors
- Advanced Optical Sensing Technologies
- Advanced Fiber Laser Technologies
- Power Line Communications and Noise
University College London
2023-2025
University College Lahore
2021
Tsinghua University
2017-2018
We demonstrate multipath interference-penalty-free S-band transmission over two G.654.E-compliant fibres with cable cutoff up to 1530 nm. No SNR degradation was observed across various distances and baud rates
A pilot-based adaptive equalizer is investigated for high cardinality polarization-division-multiplexing quadrature amplitude modulation transmission systems. Pilot symbols are periodically inserted joint estimation of the dynamic state polarization (SOP) and carrier phase, in a least mean square (LMS) sense. Compared to decision-directed (DDLMS) equalization radially-directed equalization, proposed can achieve robust phase estimation, especially low optical signal-to-noise ratio (OSNR)...
A 223 km unrepeated transmission link is experimentally demonstrated using 121 nm optical bandwidth. Optimised bidirectional Raman amplification as well Thulium- and Erbium-doped fibre amplifiers enable a record throughput of 122.62 Tb/s.
A broadband photonic analog-to-digital converter (ADC) for X-band radar applications is proposed and experimentally demonstrated. An signal with arbitrary waveform a bandwidth up to 2 GHz can be synchronously sampled processed due the optical sampling structure. In experiment, chirp centered at 9 of 1.6 down-converted signal-to-noise ratio 7.20 dB an improved noise figure. Adopting ADC in receiver above as transmitted signal, inverse synthetic aperture system set up, range cross-range...
We experimentally investigated the performance of split nonlinearity compensation schemes for single and multi-channel WDM systems. show that NLC SNR gains more than 0.4 dB at 5540 km can be achieved compared to transmitter- or receiver-side DBP alone when signal-ASE beating limits transmission performance.
The accuracy of a recently-developed closed-form GN nonlinear interference model is evaluated in experimental 1065 km S+C+L band WDM transmission with backward Raman pumping. accurately estimates the and ASE total SNR error less than 0.6 dB.
Ultra-wideband, field-deployed metropolitan fibre transmission is experimentally demonstrated, measuring a record 202.3 Tb/s GMI and 189.5 after decoding with 20.9 dBm launch power lumped amplification only. An experimentally-optimised 5 dB pre-tilt over the 15.6 THz optical bandwidth was applied to overcome ISRS.
Picosecond optical pulses are widely used in communication systems, such as the time division multiplexing (OTDM) and photonic analog-to-digital converter (ADC). We have proposed demonstrated a simple method to generate picosecond pulse using mach-zehnder modulator (MZM), phase (PM) single model fiber (SMF). The is frequency chirp which varies periodically with time. MZM suppress pedestal of improve performance pulse. SMF compensate chirp. carried out theoretical analysis numerical...
A pump dithering removal algorithm, based on pilot sequence-aided DSP, is proposed and experimentally validated in dual polarization 64 QAM optical phase conjugation system. 4.2 dB SNR improvement was observed due to the SBS suppression.
A pump dithering removal algorithm, based on pilot sequence-aided DSP, is proposed and experimentally validated in dual polarization 64 QAM optical phase conjugation system. 4.2 dB SNR improvement was observed due to the SBS suppression.