A5027057724- Optical Network Technologies
- Advanced Photonic Communication Systems
- Advanced Fiber Laser Technologies
- Photonic and Optical Devices
- Semiconductor Lasers and Optical Devices
- Blind Source Separation Techniques
- Nanowire Synthesis and Applications
- Thin-Film Transistor Technologies
- Advanced Optical Network Technologies
- Radio Frequency Integrated Circuit Design
- solar cell performance optimization
- Silicon and Solar Cell Technologies
- Photonic Crystal and Fiber Optics
- Advanced Algorithms and Applications
- Terahertz technology and applications
- Magnetic Properties and Applications
- Water Quality Monitoring and Analysis
- Induction Heating and Inverter Technology
Karlsruhe Institute of Technology
2017-2024
North South University
2012-2013
We propose a low-complexity digital implementation of the Kramers-Kronig receiver and analyze its performance complexity. In simulations experiments, we find that relatively small number filter taps is sufficient to achieve reasonably high accuracy for phase retrieval reconstruction complex field. show strongly depends on details system design. Unnecessarily broad optical filters decrease reception quality, because additional noise makes violation minimum-phase condition more likely. Narrow...
Photonics might play a key role in future wireless communication systems that operate at THz carrier frequencies.A prime example is the generation of data streams by mixing optical signals high-speed photodetectors.Over previous years, this concept has enabled series transmission experiments record-high rates.Reception these experiments, however, still relied on electronic circuits.In paper, we show receivers can also greatly benefit from optoelectronic signal processing techniques,...
Coherent reception becomes an interesting option when data rates in time-division-multiplexed (TDM) passive optical networks (PONs) grow beyond 50 Gbit/s. Controlling the wavelength, i.e., frequency, and phase of laser acting as local oscillator (LO) is one main technical challenges design coherent TDM PONs. In network units (ONUs), low-cost lasers are required, which come at expense wavelength variations drifts over multiple nanometers due to fabrication imperfections, temperature...
We propose a colorless coherent PON architecture alleviating the need for wavelength locking of ONU lasers. Using two different types comb sources, we demonstrate error-free reception at −25 dBm received power over bandwidths 600 GHz and 1 THz, respectively.
We show coherent wireless transmission at carrier frequencies within 0.30+0.02 THz using up to 20 QPSK-modulated subcarriers with a symbol rate of 0.75 GBd each, leading an aggregate line 30 Gbit/s. exploit optoelectronic techniques, both for generation and reception.
We propose and demonstrate a low complexity non decision directed blind carrier recovery algorithm (NDD-CRA) for 16-QAM optical coherent receivers. Through optimization of step size parameter (μ), we obtained similar performance compared to decision-directed phase estimation algorithm, however, our scheme has less the (DD-CRA) as proposed does not require any feedback module. From simulation, it is observed that than 1.7 dB OSNR penalty at 10 <sup...
Coherent reception, along with time- and wavelength-division multiplexing (TWDM), is a promising concept to simultaneously support multiple services in future high-speed point-to-multipoint passive optical networks (PONs). The next-generation PON 2 (NG-PON2) standard describes TWDM-PON based on IM/DD intensity modulation direct detection (IM/DD) which employs tunable-lasers filters such as tunable or cyclic arrayed-waveguide gratings. Here, we investigate what believe be novel coherent...
We proposed and demonstrate simple efficient absorption geometry using slanted micro-hole architecture for planer C-Si solar cell. Our analysis result found that the can enhance absorbance ultimate efficiency is over 28%.
We analyze the performance of Kramers-Kronig receiver in a DWDM transmission system. find that for symbol rate 32 GBd an optical filter bandwidth less than 50 GHz is required to keep beat-noise penalties low.
We propose and demonstrate least radial distance based carrier-phase recovering method for 16-QAM coherent optical systems. Through numerical analysis, we found proposed scheme has less than 2dB SNR penalty when laser linewidth-symbol-duration-product Δϑ Ts ≅ 1 × 10−4 range.
We propose a new radial directed joint equalization technique for blind adaptive and Carrier Phase Estimation of Quadrature Amplitude Modulation (QAM) in coherent optical fiber communication. By taking the advantages constant modulus algorithm (RD-CMA) multimodulus (MMA), we introduced can be call Radial Directed Multi Modulus Algorithm (RD-MMA) which compensate dispersions phase fluctuations hence laser noise. comparing with traditional multi (MMA) found MMA up to 30 KHz Laser noise where...
We analyze the impact of clipping and quantization errors in a burst-mode coherent PON receiver. At an ENOB about 5 bit, we achieve dynamic range 20 dB without any adaptive gain control.
We demonstrate add/drop multiplexing of optical QPSK signals using an optic-electronic-optic (OEO) interferometer with a processing path including opto-electronic coherent detection, real-time digital signal processing, and electro-optic complex field remodulation.
We propose a new NDA-LMS algorithm for joint equalization and carrier recovery. Our analysis shows that without any phase estimation circuit can jointly achieve bit error rate (BER) of 10−3 with less than 2.8dB OSNR penalty ΔνT is 10−4 150Km impairment.
We propose and demonstrate a blind adaptive algorithm in 16-QAM optical coherent receiver for LR-PON. Our analysis result shows that our proposed can jointly achieve BER of 10−3 with less than 1.7dB OSNR penalty ΔνT 10−5 1360ps/nm impairments.
We propose and demonstrate a blind adaptive algorithm in 16-QAM optical coherent receiver for LR-PON. Our analysis result shows that our proposed can jointly achieve BER of 10−3 with less than 1.7dB OSNR penalty ΔνT 10−5 1360ps/nm impairments.
We propose and demonstrate a simple improved absorption geometry using micro-hole architecture for micro concentrating photovoltaic (MCPV). Each concentrator is coupled with very small C-Si solar cell. The incident light concentrated by on the area thick film (PV). PV designed proposed based to facilitate maximum of into device. Our analysis found that absorptance cell over 71% ultimate efficiency 35% architecture. Additionally, reflected from surface being trapped multimode wave guide full...
We propose and demonstrate a new 112 Gbps Polarization division Multiplexing digital optical coherent systems with hexagonal 16-QAM (HEX-16-QAM) modulation. In our proposed system we use decision directed dispersion compensation algorithm which is Least Mean Square (LMS) single tap carrier recovery algorithm. compare the HEX-16-QAM for uncompensated transmission. Our analysis result found that can achieve bit error rate (BER) of 1.5×10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML"...
We propose and demonstrate a new Non-Decision Aid Modified Least Mean Square (NDA-MLMS) algorithm for joint blind equalization carrier recovery. The bit error rate (BER) of 10−3 is achieved with less than 1.9dB OSNR penalty 14Gbaud 4-QAM system after 100km transmission 500 KHz linewidth laser.
We propose and demonstrate a new blind carrier recovering technique, named, Level Discrimination Carrier Recovery Algorithm (LD-CRA) for optical coherent receiver. Our proposed single tap LD-CRA can blindly compensate the laser phase noise without using any training sequence. analysis result found that 300 KHz linewidth laser, OSNR penalty is below 1.4dB at 10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">-3</sup> bit error rate (BER) which...
We propose and demonstrate a new Non-Decision Aid Modified Least Mean Square (NDA-MLMS) algorithm for joint blind equalization carrier recovery. The bit error rate (BER) of 10−3 is achieved with less than 1.9dB OSNR penalty 14Gbaud 4-QAM system after 100km transmission 500 KHz linewidth laser.
We propose and demonstrate a low complexity blind Level Discrimination Carrier Recovery Algorithm (LD-CRA) for optical coherent receivers. Through optimization of step size parameter we found that LD-CRA has below 2 dB OSNR penalty 14Gbaud 16-QAM signal 600 kHz line width laser.