A5065489904- Optical Network Technologies
- Advanced Photonic Communication Systems
- Advanced Fiber Laser Technologies
- Photonic and Optical Devices
- Photonic Crystal and Fiber Optics
- Semiconductor Lasers and Optical Devices
- Advanced Fiber Optic Sensors
- Laser-Matter Interactions and Applications
- Advanced Optical Network Technologies
- Optical Coherence Tomography Applications
- Advanced Fluorescence Microscopy Techniques
- Advanced Wireless Communication Techniques
- Optical Wireless Communication Technologies
- Mechanical and Optical Resonators
- Solid State Laser Technologies
- Laser Material Processing Techniques
- Advanced Optical Sensing Technologies
- Interconnection Networks and Systems
- Quantum Information and Cryptography
- Spectroscopy Techniques in Biomedical and Chemical Research
- Orbital Angular Momentum in Optics
- Embedded Systems Design Techniques
- Photoacoustic and Ultrasonic Imaging
- Plasmonic and Surface Plasmon Research
- Near-Field Optical Microscopy
Technical University of Denmark
1998-2025
Ørsted (Denmark)
2019-2025
Optical Fiber Solutions (Denmark)
2015-2024
Foton Motors (China)
2021
Naos Marine and Molecular Laboratories
2013
Nokia (United States)
2013
FORCE Technology (Denmark)
1999-2005
Alcatel Lucent (Germany)
2000-2005
OFS (United States)
2001-2003
Lyngsø Marine (Denmark)
1997
A method for measuring the nonlinear refractive index of optical fibers with an error less than 5% is demonstrated. The technique based on phase shift experienced by a dual-frequency beat signal, permitting simple, highly sensitive, accurate, repeatable, and easily automated measurement procedure sampling. Measurements coefficient in standard telecommunication, dispersion-shifted, number dispersion-compensated are presented.
This paper reviews properties and use of conventional single-mode dispersion-compensating fibers (DCFs). The quality the dispersion compensation expressed as residual after is treated. Properties actual DCFs for discrete including loss nonlinear effects are discussed. Fiber design with special emphasis on tradeoffs considered. Raman their a amplifier also Finally, DCF in dispersion-managed cables (DMCs) addressed, optimum fiber comparison different configurations.
Transmission of a 73.7 Tb/s (96x3x256-Gb/s) DP-16QAM mode-division-multiplexed signal over 119km few-mode fiber transmission line incorporating an inline multi mode EDFA and phase plate based (de-)multiplexer is demonstrated.Data-aided 6x6 MIMO digital processing was used to demodulate the signal.The total demonstrated net capacity, taking into account 20% FEC-overhead 7.5% additional overhead (Ethernet training sequences), 57.6 Tb/s, corresponding spectral efficiency 12 bits/s/Hz.
We transmit over all 30 spatial and polarization modes of a 22.8-km multimode fiber. 15-mode photonic lanterns enabled low-loss coupling into out the fiber time-multiplexed coherent receiver facilitates measurement signals.
A transmission fiber for mode division multiplexing supporting LP01 and LP11 modes, with low differential group delay, coupling loss both modes is presented. S2 imaging used characterization.
We present the first demonstration of a multimode (two modegroup) erbium-doped fiber amplifier for Space Division Multiplexed (SDM) applications and demonstrate various design performance features such devices.In particular we experimentally that differential modal gains can be controlled reduced both by control pump field distribution.Using suitably designed simultaneous ~20dB different pair-wise combinations spatial polarization modes in an EDFA supporting amplification 6 distinct modes.
The first demonstration of a hollow core photonic bandgap fiber (HC-PBGF) suitable for high-rate data transmission in the 2 µm waveband is presented.The has record low loss this wavelength region (4.5 dB/km at 1980 nm) and >150 nm wide surface-mode-free window center bandgap.Detailed analysis optical modes their propagation along fiber, carried out using time-of-flight technique conjunction with spatially spectrally resolved (S ) imaging, provides clear evidence that HC-PBGF can be operated...
We show for the first time 100 Gbit/s total capacity at 2 µm waveband, using 4 × 9.3 4-ASK Fast-OFDM direct modulation and 15.7 NRZ-OOK external modulation, spanning a 36.3 nm wide wavelength range.WDM transmission was successfully demonstrated over 1.15 km of low-loss hollow core photonic bandgap fiber (HC-PBGF) 1 solid (SCF).We conclude that OSNR penalty associated with SCF is minimal, while ~1-2 dB observed after HC-PBGF probably due to mode coupling higher-order modes.
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.
Abstract We present the first demonstration of shot-noise limited supercontinuum-based spectral domain optical coherence tomography (SD-OCT) with an axial resolution 5.9 μm at a center wavelength 1370 nm. Current SD-OCT systems cannot be operated in detection regime because severe pulse-to-pulse relative intensity noise supercontinuum source. To overcome this disadvantage, we have developed low-noise source based on all-normal dispersion (ANDi) fiber, pumped by femtosecond laser. The...
A 1.28 Tbaud data signal is demonstrated, which the highest symbol rate yet reported. The formed by optical time-division multiplexing of 128 channels at 10 Gbit/s OOK in a single polarisation. generated Tbit/s demultiplexed nonlinear loop mirror, resulting error-free performance with BER<10−9 for all channels.
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.
We show transmission of a 73.7 Tb/s (96×3×256-Gb/s) DP-16QAM mode-division-multiplexed signal over 119km few-mode fiber with inline multi-mode EDFA, using 6x6 MIMO digital processing. The total demonstrated net capacity is 57.6 (SE 12 bits/s/Hz).
Swept-wavelength interferometry can rapidly characterize the amplitude and phase transfer matrices of multi-mode fibers components. We will show measurements short (meter) long (kilometer) few-mode, multi-mode, coupled multi-core fibers.
Unlocking the true potential of optical spectroscopy on nanoscale requires development stable and low-noise laser sources. Here, we have developed a supercontinuum (SC) source based an all-normal dispersion fiber pumped by femtosecond demonstrate high resolution, spectrally resolved near-field measurements in near-infrared (NIR) region. Specifically, explore reduced-noise requirements for aperture-less scattering-type scanning microscopy (s-SNOM), including inherent pulse-to-pulse...
By combining a special dispersion map that has nearly constant path-average dispersion, hybrid amplification scheme involving backward-pumped Raman gain, and sliding-frequency guiding filters, we have demonstrated massive wavelength-division multiplexing at 10 Gbits/s per channel, error free (bit-error rate, ≤1×10-9 for all channels), without the use of forward correction, over greater than 9000 km, using dispersion-managed solitons. The number channels (27) was limited only by temporary...
We present single-scan measurements of the transfer matrix space-division multiplexed systems including mode-multiplexers and fibers. obtain mode-dependent loss, differential group delay over 110-nm bandwidth a 4.7-km 3-mode fiber.
We report on the multiplexing of 12 spatial and polarization channels 120 wavelength in C -band, each carrying 16 quadratic-amplitude modulation symbols at 30 GBd over graded-index few-mode fiber. A combination multiple fiber spools with positive negative modal dispersion values is exploited to form a 59-km link 0.35-ns differential mode group delay. The placed inside sixfold synchronized recirculating loop transmission setup. Photonic lanterns low insertion mode-dependent loss are employed...
The non-cloning theorem of quantum states provides security, but also limits the Secret Key Rate (SKR) for Quantum Distribution (QKD) implementations. Multiplexing is a widely used technique to enhance data rates in classical communication systems and can increase SKR QKD systems. Using linearly polarized (LP) modes an attractive solution as it compatible with simple fiber designs. This work demonstrates fiber-based system employing LP mode multiplexing photonic lantern convert fundamental...
We use a novel fiber-grating device to demonstrate the first polarization-insensitive all-fiber higher order mode dispersion compensator for broad-band compensation. Its low loss and high effective area have enabled transmission through 1000 km (10/spl times/100 km) of nonzero dispersion-shifted fiber (NZDSF) at 40 Gb/s.