A5082315536- Optical Network Technologies
- Photonic and Optical Devices
- Advanced Photonic Communication Systems
- Semiconductor Lasers and Optical Devices
- Advanced Optical Network Technologies
- Advanced Fiber Laser Technologies
- Semiconductor Quantum Structures and Devices
- Advanced Fiber Optic Sensors
- Advancements in Semiconductor Devices and Circuit Design
- Radio Frequency Integrated Circuit Design
- Semiconductor materials and devices
- Nanowire Synthesis and Applications
- Optical Wireless Communication Technologies
- Integrated Circuits and Semiconductor Failure Analysis
- Error Correcting Code Techniques
- Photorefractive and Nonlinear Optics
- Photonic Crystal and Fiber Optics
- Advancements in PLL and VCO Technologies
- Advanced Wireless Communication Techniques
- PAPR reduction in OFDM
- Neural Networks and Reservoir Computing
- graph theory and CDMA systems
- Radiation Effects in Electronics
- Quantum Information and Cryptography
- Advanced MEMS and NEMS Technologies
Nokia (United States)
2011-2020
Alcatel Lucent (Germany)
2001-2015
Advanced Numerical Research and Analysis Group
2013
Lucent Optics (United States)
2008
AT&T (United States)
1989-2005
Indian Institute of Science Bangalore
2004
University of California, Irvine
2004
University of Notre Dame
2002
Oregon State University
1998
Tata Institute of Fundamental Research
1987-1989
We describe a new multicore fiber (MCF) having seven single-mode cores arranged in hexagonal array, exhibiting low crosstalk among the and loss across C L bands. experimentally demonstrate record transmission capacity of 112 Tb/s over 76.8-km MCF using space-division multiplexing dense wavelength-division (DWDM). Each core carries 160 107-Gb/s polarization-division multiplexed quadrature phase-shift keying (PDM-QPSK) channels on 50-GHz grid bands, resulting an aggregate spectral efficiency...
We report 2.5 Tb/s (64 /spl times/ 42.7-Gb/s) WDM transmission over 4000 km (forty 100-km spans) of non-zero dispersion-shifted fiber. This capacity distance record 10 petabit-km/s for 40-Gb/s systems is achieved in a single 53-nm extended L band using return-to-zero differential-phase-shift-keyed modulation, balanced detection, and distributed Raman amplification.
We present silicon photonic integrated circuits (PICs) based coherent optical transmitters and receivers for high-speed long-distance fiber transmission. High-degree integration is achieved by monolithically integrating electro-optic modulators, germanium photo detectors, nitride-assisted on-chip polarization rotators, thermal phase shifters, various passive devices on a single wafer platform. demonstrate the use of these PICs modulating detecting 112-Gb/s polarization-division-multiplexed...
We propose a novel coherent optical orthogonal frequency-division multiplexing (CO-OFDM) scheme with reduced guard interval (RGI) for high-speed high-spectral-efficiency long-haul transmission. In this scheme, fiber chromatic dispersion is compensated within the receiver rather than being accommodated by (GI) as in conventional CO-OFDM, thereby reducing needed GI, especially when large. demonstrate generation of 448-Gb/s RGI-CO-OFDM signal 16-QAM subcarrier modulation through band...
We discuss the generation, wavelength-division-multiplexed (WDM) long-haul transmission, and coherent detection of 224-Gb/s polarization-division-multiplexed (PDM) 16-ary quadrature amplitude modulation (16-QAM) at a line rate 28 Gbaud. measure required optical signal-to-noise ratio 23.4 dB (0.1-nm reference bandwidth; 10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">-3</sup> bit-error ratio), 3.4-dB off theoretical limit. Using...
In this paper, we review in detail experimental demonstrations of Kramers–Kronig (KK) based direct detection systems with high per-carrier interface rates, spectral efficiencies, and ∼100-km reach. Two realizations KK-based receivers are summarized, including single-polarization dual-polarization versions. Critical aspects the KK receiver such as carrier-to-signal power ratio bandwidth limitations discussed. We show 220-Gb/s single-diode 4 × 240-Gb/s dual polarization (dual-diode) a WDM...
<para xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> In this paper, we realized a monolithic silicon photonic integrated circuit (PIC) for polarization and phase diversity coherent detection. The PIC includes two beam splitters, 90<formula formulatype="inline"> <tex Notation="TeX">$^{\circ}$</tex></formula> optical hybrids, four pairs of balanced photodiodes implemented as germanium detectors. We tested the using polarization-division multiplexed...
This paper reviews recent advances in the generation, detection and transmission of orthogonal-frequency-division-multiplexing (OFDM) based superchannels, enabled by efficient powerful digital signal processors. The use OFDM to form a superchannel can be (1) at modulation stage naturally realizing square-like spectral shape allow close packing multiple modulated signals, and/or (2) optical multiplexing seamlessly these signals. this field. Several OFDM-based architectures are described compared.
We transmit 32 WDM channels over 12 spatial and polarization modes of 177 km few-mode fiber at a record spectral efficiency bit/s/Hz. The transmitted signals are strongly coupled recovered using 12×12 multiple-input multiple-output digital signal processing.
Digital signal processing (DSP) combined with coherent detection has played a central role in the recent capacity expansion of optical networks. Optical superchannels aim to increase per-channel interface rates as well per-fiber capacities wavelength-division multiplexed (WDM) systems cost-effective manner. Superchannels circumvent electronic bottleneck via parallelism and provide high-per-channel data better spectral utilization, especially transparent mesh This article reviews advances...
We demonstrate a 218-Gb/s direct detection receiver using Kramers-Kronig optical phase reconstruction and chromatic dispersion compensation based on single photodiode achieve single-span transmission over 125 km of standard singlemode fiber at 1550 nm.
We demonstrate an all-electronic digital-to-analog converter (DAC) with 100-GHz electrical bandwidth, sampling at 240 GSa/s, based on digital band interleaving (DBI). discuss predistortion techniques for compensating the nonideal performance of high-speed and radio-frequency components in our DBI architecture. then test DAC by generating up to 190-GBaud Nyquist-shaped pulse amplitude modulation. analyze interleaved coherent detection single-polarization optical binary phase-shift keying 140 GBaud.
We present a novel scheme to cancel signal-signal beat interference in direct-detection systems with single-sideband modulation. use this successfully transmit 80-Gb/s SSB-DMT at 1550 nm over 80-km SSMF margin.
Current theories of stellar scintillation and astronomical seeing suppose that there is a disturbed region in the atmosphere at height about 4 km which corrugates plane wave-front passing through it; observed phenomena are to be accounted for terms such corrugated wave-front. On assumption turbulent layer refractive index, µ, subject irregular fluctuations, auto-correlation, |$\bar{\delta \mu ({r}_{1})\delta ({r}_{2})}/\bar{{\delta }^{2}\mu }$|, instantaneous fluctuations index two...
We demonstrate transmission of a probabilistically shaped polarization-division multiplexed 3-GBd 4096-QAM signal over up to 200 km backward Raman amplified Corning® Vascade® EX2000 fiber. The with root-raised-cosine roll-off 0.01 has the potential generate spectral efficiency 19.77 bit/s/Hz 50
We experimentally investigate the performance of a spectrally efficient multi-carrier channel consisting two or more optical carriers spaced around baud rate, with each carrier modulated polarization division multiplexed (PDM) quadrature phase shift keyed (QPSK) format. first study 100-Gb/s 2-carrier PDM-QPSK at 12.5 Gbaud as function various design parameters such time alignment between carriers, frequency separation oversampling factor receiver, and bandwidth digital pre-filter used for...
We discuss the generation, detection, and long-haul transmission of single-polarization differential quadrature phase shift keying (DQPSK) signals at a line rate 53.5 Gbaud to support net information bit 100 Gb/s. In laboratory, we demonstrate 10-channel wavelength-division multiplexed (WDM) point-to-point over 2000 km on 150-GHz WDM grid, 1200-km optically routed networking including 6 reconfigurable optical add/drop multiplexers (ROADMs) 100-GHz grid. then report commercial, 50-GHz spaced...
We generate 56-Gbaud PDM 16-QAM using electronic time-division multiplexing (ETDM) and a four-level-driven I/Q modulator. The 448-Gb/s line-rate signal is transmitted over 1,200 km of ultra-large-area fiber coherently received by two 32.5-GHz oscilloscopes with >5.5 effective bits.
Using a Si photonic integrated circuit and separate SiGe transimpedance amplifiers, we created high-performance dual-polarization, dual-quadrature coherent receiver. It requires only 16.3-dB optical signal-to-noise ratio to receive 112-Gb/s polarization-division-multiplexed quadrature phase-shift keying signal at <formula formulatype="inline" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex Notation="TeX">$10^{-3}\ \hbox{bit-error}\...
We report the transmission of probabilistically shaped (PS) 64-ary quadrature amplitude modulation (QAM) at 7.46 b/s/Hz over a 5523-km in-service trans-Atlantic fiber-optic cable that consists 65-89-km spans Erbium-doped fiber amplifier only amplified fiber. Using looped-back system configuration, we achieve 5.68 trans-Pacific-equivalent distance 11 046 km. Net spectral efficiencies are increased by 18% and 80% using PS, 5523 km km, respectively, compared to uniform square QAM. Throughout...
We demonstrate 2688-km multi-span transmission using wavelength-division multiplexing (WDM) of ten 50-GHz spaced 128-Gb/s PDM-QPSK signals, space-division multiplexed (SDM) in a low-crosstalk 76.8-km seven-core fiber, achieving record net aggregate per-fiber-spectral-efficiency-distance product 40,320 km·b/s/Hz. The demonstration was enabled by novel core-to-core signal rotation scheme implemented 7-fold, synchronized recirculating loop apparatus.
Recently, there is increasing interest in utilizing Stokes vector receiver, which a direct-detection technique with the capability to digitally track polarization changes fibers and decode information multiple dimensions. Here, we report monolithically integrated silicon photonic consists of one beam splitter, two rotators, 90-degree optical hybrid, six germanium photodetectors. Paired in-phase/quadrature modulator incorporating power-tunable carrier orthogonal polarization, transmission at...