Multi-wavelength phase unwrapping: a versatile tool for extending the measurement range, breaking the Nyquist limit, and encrypting optical communications

2018 ◽  
Author(s):  
Konstantinos Falaggis ◽  
Ana Hiza Ramirez Andrade ◽  
Rosario Porras-Aguilar ◽  
David P. Towers ◽  
Catherine E. Towers
Keyword(s):  
Optical Communications ◽  
Measurement Range ◽  
Phase Unwrapping ◽  
Versatile Tool ◽  
Multi Wavelength ◽  
Nyquist Limit

MoS2-wrapped microfiber-based multi-wavelength soliton fiber laser

2017 ◽  
Vol 31 (32) ◽  
pp. 1750303 ◽  
Author(s):  
Feifei Lu
Keyword(s):  
Pump Power ◽  
Fiber Laser ◽  
Saturable Absorber ◽  
Optical Communications ◽  
Fiber Lasers ◽  
Tunable Filter ◽  
Linear Birefringence ◽  
Erbium Doped ◽  
Potential Applications ◽  
Multi Wavelength

The single-, dual- and triple-wavelength passively mode-locked erbium-doped fiber lasers are demonstrated with MoS2 and polarization-dependent isolator (PD-ISO). The saturable absorber is fabricated by wrapping an MoS2 around a microfiber. The intracavity PD-ISO acts as a wavelength-tunable filter with a polarization controller (PC) by adjusting the linear birefringence. Single-wavelength mode-locked fiber laser can self-start with suitable pump power. With appropriate PC state, dual- and triple-wavelength operations can be observed when gains at different wavelengths reach a balance. It is noteworthy that dual-wavelength pulses exhibiting peak and dip sidebands, respectively, are demonstrated in the experiment. The proposed simple and multi-wavelength all-fiber conventional soliton lasers could possess potential applications in numerous fields, such as sensors, THz generations and optical communications.

Multi-wavelength fiber-optic confocal position sensor with diffractive optics for enhanced measurement range

2007 ◽  
Author(s):  
Garry Berkovic ◽  
Ehud Shafir ◽  
Michael A. Golub ◽  
Moshe Bril ◽  
Valery Shurman
Keyword(s):  
Fiber Optic ◽  
Measurement Range ◽  
Diffractive Optics ◽  
Position Sensor ◽  
Multi Wavelength

scholarly journals Coherent optical communications using coherence-cloned Kerr soliton microcombs

2021 ◽  
Author(s):  
Yong Geng ◽  
Heng Zhou ◽  
Xinjie Han ◽  
Wenwen Cui ◽  
Qiang Zhang ◽  
...  
Keyword(s):  
Optical Communications ◽  
Coherent Detection ◽  
Laser Source ◽  
Phase Estimation ◽  
Local Oscillators ◽  
Fiber Optical ◽  
Multi Wavelength ◽  
Fiber Optical Communications ◽  
On Chip ◽  
Digital Processes

Abstract Dissipative Kerr soliton microcomb has been recognized as a promising on-chip multi-wavelength laser source for fiber optical communications, as its comb lines possess frequency and phase stability far beyond the independent lasers. In the scenarios of coherent optical transmission and interconnect, a highly beneficial but rarely explored target is to re-generate a Kerr soliton microcomb at the receiver side as local oscillators that conserve the frequency and phase property of the incoming data carriers, so that to enable coherent detection with minimized optical and electrical compensations. Here, by using the techniques of pump laser conveying and two-point locking, we implement re-generation of a Kerr soliton microcomb that faithfully clones the frequency and phase coherence of another microcomb sent from 50 km away. Moreover, leveraging the coherence-cloned soliton microcombs as carriers and local oscillators, we demonstrate terabit coherent data interconnect, wherein traditional digital processes for frequency offset estimation is totally dispensed with, and carrier phase estimation is substantially simplified via slowed-down phase estimation rate per channel and joint phase estimation among multiple channels. Our work reveals that, in addition to providing a multitude of laser tones, regulating the frequency and phase of Kerr soliton microcombs among transmitters and receivers can significantly improve optical coherent communication in terms of performance, power consumption, and simplicity.

Measurement System Based on Multi-Wavelength Interferometry for Long Gauge Block Calibration

2013 ◽  
Vol 20 (3) ◽  
pp. 479-490 ◽  
Author(s):  
Michal Wengierow ◽  
Leszek Salbut ◽  
Zbigniew Ramotowski ◽  
Robert Szumski ◽  
Ksawery Szykiedans
Keyword(s):  
Central Office ◽  
Measurement Range ◽  
Standard Uncertainty ◽  
Precision Measurements ◽  
Environmental Condition ◽  
Analysis Software ◽  
Gauge Block ◽  
Image Analysis Software ◽  
University Of Technology ◽  
Multi Wavelength

Abstract This paper shows the result of work of the Institute of Micromechanics and Photonics at Warsaw University of Technology and the Length and Angle Division of Central Office of Measures (GUM) [1] in building an automatic multiwavelength interferometric system with extended measurement range for calibration of long (up to 1 m) gauge blocks. The design of a full working setup with environmental condition control and monitoring systems, as well as image analysis software, is presented. For length deviation determination the phase fraction approach is proposed and described. To confirm that the system is capable of calibrating gauge blocks with assumed accuracy, a comparison between the results of 300 mm length gauge block measurement obtained by using other systems from the Central Office of Measures is made. Statistical analysis proved that the system can be used for high precision measurements with assumed standard uncertainty (125 nm for a length of 1 m). Finally the comparison between our results obtained for a long gauge block set (600 mm to 1000 mm long) and previous calibrations made by the Physikalisch-Technische Bundesanstalt (PTB) [2] is shown

scholarly journals Multi-wavelength source using low drive-voltage amplitude modulators for optical communications

2007 ◽  
Vol 15 (6) ◽  
pp. 2981 ◽  
Author(s):  
Tadhg Healy ◽  
Fatima C. Garcia Gunning ◽  
Andrew D. Ellis ◽  
Jeff D. Bull
Keyword(s):  
Optical Communications ◽  
Voltage Amplitude ◽  
Drive Voltage ◽  
Multi Wavelength

Generalized Phase Unwrapping for Multi-Wavelength Interferometry

Fringe 2013 ◽  
2014 ◽  
pp. 653-656
Author(s):  
Konstantinos Falaggis ◽  
David P. Towers ◽  
Catherine E. Towers
Keyword(s):  
Phase Unwrapping ◽  
Multi Wavelength

scholarly journals Multi-Wavelength Digital-Phase-Shifting Moiré Based on Moiré Wavelength

2019 ◽  
Vol 9 (9) ◽  
pp. 1917 ◽  
Author(s):  
Fatemeh Mohammadi ◽  
Jonathan Kofman
Keyword(s):  
Continuous Phase ◽  
Phase Unwrapping ◽  
Phase Shifting ◽  
Surface Shape ◽  
Digital Phase ◽  
Temporal Phase ◽  
Single Pattern ◽  
Multi Wavelength ◽  
Phase Map ◽  
Surface Discontinuities

Multi-wavelength digital-phase-shifting moiré was demonstrated using multiple moiré wavelengths determined by system calibration over the full working depth. The method uses the extended noisy phase map as a reference to unwrap the phase map with a shorter wavelength, and thus achieve a less noisy and more accurate continuous phase map. The moiré wavelength calibration determines a moiré-wavelength to height relationship that permits pixelwise refinement of the moiré wavelength and height during 3D reconstruction. Only a single pattern has to be projected and, thus, a single image captured to compute each phase map with a different wavelength to perform digital-phase-shifting moiré temporal phase unwrapping. Only two captured images are required for two-wavelength phase unwrapping and three captured images for three-wavelength phase unwrapping. The method has been demonstrated in the 3D surface-shape measurement of an object with surface discontinuities and spatially isolated objects.

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