A5011912810- Optical Network Technologies
- Advanced Fiber Laser Technologies
- Photonic and Optical Devices
- Advanced Photonic Communication Systems
- Semiconductor Lasers and Optical Devices
- Photonic Crystal and Fiber Optics
- Advanced Fiber Optic Sensors
- Laser-Matter Interactions and Applications
- Radio Frequency Integrated Circuit Design
- Advanced Optical Network Technologies
- Solid State Laser Technologies
- Optical Coherence Tomography Applications
- Advanced Power Amplifier Design
- Optical Wireless Communication Technologies
- Railway Systems and Energy Efficiency
- Electrical Contact Performance and Analysis
- Semiconductor materials and devices
- PAPR reduction in OFDM
- Advancements in Semiconductor Devices and Circuit Design
- Power Line Communications and Noise
Nokia (United States)
2023-2025
Chalmers University of Technology
2017-2023
Nanosc (Sweden)
2017-2023
Karlsruhe Institute of Technology
2016-2017
Indian Institute of Technology Madras
2012-2014
St. Joseph’s College of Engineering
2012
Saint Joseph's College
2012
Lasers are often used to characterize samples in a non-destructive manner and retrieve sensing information transduced changes amplitude phase. In swept wavelength interferometry, wavelength-tunable laser is measure the complex response (i.e. phase) of an optical sample. This technique leverages continuous advances rapidly tunable lasers widely for sensing, bioimaging testing photonic integrated components. However, requires additional calibration step because, practice, it does not tune at...
We experimentally show feasibility of downstream 200 Gbit/s IM/DD TPDM PON system with >4 dB margin to 29 optical power budget based on two 100 polarization channels in a single wavelength window. The uses SBS suppression mitigate nonlinear fiber loss and duoternary modulation overcome bandwidth limitation.
Using a frequency comb from quantum-dash mode-locked laser-diode, we transmit line rate of 8.32 Tbit/s (52×40 GBd PDM-QPSK). Isolated lines do not show an additional penalty compared to high-quality ECL.
In this paper, we propose and numerically investigate waveguide tapering to improve optical parametric amplification in integrated nonlinear Si3N4 circuits. The phase matching condition of changes along the length uniform waveguides, due non-negligible propagation loss, potentially causing peak-gain wavelength shifts more than 20 nm. By width propagation, can achieve a 2.5 dB higher maximum gain thanks improved matching, which also broaden bandwidth. Therefore, an optimally tapered be 23%...
We experimentally demonstrate a novel size reduction approach for symbol-based look-up table (LUT) digital predistortion (DPD) of the transmitter impairments taking advantage periodicity in pattern-dependent distortions. Compared to other reduced-size LUT schemes, proposed method can significantly lessen storage memory requirements with negligible performance penalty high-order modulation formats. To further alleviate restriction, twice scheme is provide reduction. Importantly, given...
We experimentally investigate a wavelength-division multiplexing (WDM) system with single span of 80 km standard single-mode fiber (SSMF) and phase-sensitive amplifier (PSA) as pre-amplifier. Using two channels spaced 25 GHz apart single-polarization 10-Gbaud quadrature phase-shift keying (QPSK) signal, we show quantitatively that PSA can mitigate self-phase modulation (SPM) cross-phase (XPM). With three QPSK 12.5 apart, verify XPM also determine an allowed loss increase 9.5 dB for the...
We demonstrate a 400G dual-wavelength dual-polarization IM-DD TDM-PON based on optical duobinary modulation with 34 dB back-to-back power budget. After 20 km of SSMF we find an path penalty below 1 dB.
We demonstrate rapid wavelength measurements with response times under 200 ns using a silicon photonic wavemeter. With this new capability, we show tracking of DFB laser's during fast ramps and short bursts, for possible use in LiDAR, sensing, imaging, or optical communication applications.
We propose and experimentally investigate a novel reduced-size look-up table (LUT) for nonlinear transceiver impairment compensation by taking advantage of the inherent periodicity symbol pattern-dependent distortions.
Optical frequency combs enable superchannel systems with dense channel spacing by providing equally-spaced lines to overcome the relative drifts of free-running lasers, achieving high spectral efficiency. However, strong inter-channel interference is induced in densely spaced due imperfect pulse-shaping, preventing further improvement system throughput. By including spectra information from adjacent channels, comb-based multi-channel equalization has been previously validated a back-to-back...
Frequency locking of lasers is fundamental to a vast number applications within the field optics. Usually, when laser an optical reference wave, it imperative that can be maintained in spite low powers. Previous solutions frequency involve injection and/or phase locked loops. While previous works have shown weak waves, we extend lowest demonstrated power by approximately 20 dB, realizing down -90 dBm, using novel digital dither phase-locked loop. Measurements error verify performance. The...
We demonstrate long-haul transmission using a hybrid amplifier approach combining distributed Raman amplification and lumped phase-sensitive amplification. Aside from the well-known resulting SNR improvement, is included in an effort to improve nonlinearity mitigation capability of amplifiers. When changing phase-insensitive operation link employing amplification, reach at BER = 10-3 increased 15 44 spans length 81 km while simultaneously increasing optimal launch power by 2 dB.
Phase-sensitive optical parametric amplifiers (PSAs) can provide low-noise amplification while simultaneously mitigating nonlinear distortions caused by the Kerr effect. However, nonlinearity mitigation using PSAs is affected link parameters, and imperfect design results in residual distortions. In this paper, we use first-order perturbation theory to describe these distortions, develop a way mitigate them modified third-order Volterra equalizer (VNLE) receiver. Using numerical simulations,...
We experimentally demonstrate a symbol-based nonlinear digital predistortion (DPD) technique utilizing supervised learning, which is robust against change of modulation format. Back-to-back transmission 30 Gbaud 32, 64 and 256QAM confirms that our scheme significantly outperforms the baseline arcsine-based predistortion.
Interleaving two soliton Kerr combs we generate 179 carriers for WDM transmission and demonstrate of a data stream 50 Tbit/s over 75 km. This is the highest rate achieved with chip-scale comb source.
Multidimensional geometric shaping has been shown to outperform uniform quadrature amplitude modulation (QAM) in optical communication systems but the complexity of symbol decision and bit mapping can often be significant as dimensionality increases. In this article, a low-complexity method based on multidimensional lattices is investigated both experiments simulations. The formats designed are called Voronoi constellations (VCs) we study them 8, 16, 32 dimensions. We obtain transmission...
The low noise figure of phase-sensitive amplifiers (PSAs) is attractive for optically pre-amplified measurement and communication systems. However, a major practical implementation difficulty pertains to the requirement phase-locked signal, idler, pump waves. Previously, injection locking co-propagating weak pilot or tapping portions received signal (lossy) carrier re-generation have been used. Here we present novel, lossless approach without any pilot, that generates receiver-local within...
We experimentally demonstrate high-cardinality, low-complexity Voronoi constellations based on the E8 lattice over multiple time slots with OSNR and launch power gains of up to 1.7 2.4 dB for back-to-back 80 km fiber transmission, respectively, compared QAM formats.
Due to their excellent scalability and better immunity short channel effects, Double gate MOSFETs rule the CMOS applications era. However for lengths below 100nm, DG still show considerable threshold voltage roll off overcome this, engineering technique can be widely used. In this paper, we systematically investigate analog/RF Noise performance of Gate engineered System-on-chip applications. A very good improvement in noise parameters such as power spectral density figure are observed case...
We quantify the maximum transmission reach for phase-insensitive amplifier (PIA) and phase-sensitive (PSA) links with different modulation formats show that increase (MTRI) when using PSAs compared to PIAs is enhanced higher-order formats. The are more susceptible smaller phase rotations from nonlinearities, efficient in mitigating these distortions. Numerical simulations were performed single- multi-span PIA PSA single multiple wavelength channels. obtain a significant enhancement MTRI both...
We experimentally investigate a phase-sensitive amplifier (PSA) link in WDM transmission scenario, focusing on nonlinearity mitigation. show that PSA effectively mitigates both cross-phase modulation (XPM) and self-phase (SPM) after over an 80-km span.