Dr. Muthu Jeganathan Profile

Dr. Muthu Jeganathan

Optical Systems Engineer at Jet Propulsion Lab

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Author

Publications (24)

Proceedings Article | 13 April 2018 Paper

MSTAR: an absolute metrology sensor with sub-micron accuracy for space-based applications

Robert Peters, Oliver Lay, Serge Dubovitsky, Johan Burger, Muthu Jeganathan

Proceedings Volume 10568, 105682O (2018) https://doi.org/10.1117/12.2500125

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Proceedings Article | 28 July 2008 Paper

Progress in deep broadband interferometric nulling with the adaptive nuller

Robert Peters, Oliver Lay, Akiko Hirai, Muthu Jeganathan

Proceedings Volume 7013, 70131V (2008) https://doi.org/10.1117/12.786845

KEYWORDS: Nulling interferometry, Mid-IR, Mirrors, Sensors, Polarization, Spectroscopy, Interferometers, Interferometry, Planets, Metrology

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Proceedings Article | 28 July 2008 Paper

Brassboard Astrometric Beam Combiner (ABC) development for the Space Interferometry Mission (SIM)

Muthu Jeganathan, Gary Kuan, Mike Rud, Sean Lin, Kristen Sutherland, James Moore, Xin An

Proceedings Volume 7013, 70134X (2008) https://doi.org/10.1117/12.789520

KEYWORDS: Mirrors, Simulation of CCA and DLA aggregates, Cameras, Camera shutters, Optical alignment, Staring arrays, Interferometry, Metrology, Mechanical engineering, Off axis mirrors

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Proceedings Article | 28 July 2008 Paper

SIM-Lite: status of the engineering progress toward flight

Frank Dekens, Eric Bloemhof, Serge Dubovitsky, Daniel Eldred, Renaud Goullioud, Muthu Jeganathan, Fabien Nicaise, Feng Zhao

Proceedings Volume 7013, 70134U (2008) https://doi.org/10.1117/12.789828

KEYWORDS: Metrology, Sensors, Interferometers, Actuators, Ferroelectric materials, Mirrors, Electronics, Cameras, Laser metrology, Switches

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Proceedings Article | 19 September 2007 Paper

Adaptive nulling in the mid-IR for the Terrestrial Planet Finder interferometer

Robert Peters, Oliver Lay, Akiko Hirai, Muthu Jeganathan

Proceedings Volume 6693, 669315 (2007) https://doi.org/10.1117/12.734775

KEYWORDS: Nulling interferometry, Mid-IR, Interferometers, Polarization, Spectroscopy, Planets, Mirrors, Gas lasers, Deformable mirrors, Phase measurement

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Proceedings Article | 28 June 2006 Paper

Adaptive nulling for the Terrestrial Planet Finder Interferometer

Robert Peters, Oliver Lay, Akiko Hirai, Muthu Jeganathan

Proceedings Volume 6268, 62681C (2006) https://doi.org/10.1117/12.672170

KEYWORDS: Nulling interferometry, Polarization, Mid-IR, Spectroscopy, Planets, Phase measurement, Mirrors, Interferometers, Sensors, Deformable mirrors

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Proceedings Article | 14 September 2005 Paper

Adaptive nulling with a deformable mirror in the near-IR

Robert Peters, Akiko Hirai, Muthu Jeganathan, Oliver Lay

Proceedings Volume 5905, 590507 (2005) https://doi.org/10.1117/12.615463

KEYWORDS: Nulling interferometry, Polarization, Mid-IR, Prisms, Actuators, Deformable mirrors, Phase measurement, Mirrors, Spectroscopy, Planets

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Proceedings Article | 20 October 2004 Paper

Near-IR demonstration of adaptive nuller based on deformable mirror

Robert Peters, Akiko Hirai, Muthu Jeganathan, Oliver Lay

Proceedings Volume 5491, (2004) https://doi.org/10.1117/12.550672

KEYWORDS: Mid-IR, Polarization, Mirrors, Nulling interferometry, Spectroscopy, Prisms, Deformable mirrors, Interferometers, Planets, Sensors

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Proceedings Article | 2 August 2004 Paper

Design considerations and validation of the MSTAR absolute metrology system

Robert Peters, Oliver Lay, Serge Dubovitsky, Johan Burger, Muthu Jeganathan

Proceedings Volume 5531, (2004) https://doi.org/10.1117/12.560036

KEYWORDS: Metrology, Distance measurement, Sensors, Mirrors, Retroreflectors, Modulators, Beam splitters, Interferometry, Interferometers, Phase shift keying

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Proceedings Article | 19 November 2003 Paper

Adaptive nulling: a new enabling technology for interferometric exoplanet detection

Oliver Lay, Muthu Jeganathan, Robert Peters

Proceedings Volume 5170, (2003) https://doi.org/10.1117/12.503759

KEYWORDS: Polarization, Nulling interferometry, Mid-IR, Mirrors, Deformable mirrors, Sensors, Beam splitters, Photons, Planets, Interferometers

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Proceedings Article | 5 July 2000 Paper

Demonstration of nanometer-level active metrology for long-range interferometric displacement measurements

Muthu Jeganathan, Serge Dubovitsky

Proceedings Volume 4006, (2000) https://doi.org/10.1117/12.390165

KEYWORDS: Transponders, Metrology, Phase measurement, Sensors, Interferometers, Mirrors, Signal detection, Heterodyning, Oscillators, Laser metrology

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Proceedings Article | 2 May 2000 Paper

Pointing and tracking subsystem design for optical communications link between the International Space Station and ground

Shinhak Lee, James Alexander, Muthu Jeganathan

Proceedings Volume 3932, (2000) https://doi.org/10.1117/12.384306

KEYWORDS: Staring arrays, Data modeling, Optical tracking, Optical communications, Sensors, Mirrors, Control systems, Quantization, Error analysis, Receivers

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Proceedings Article | 26 April 1999 Paper

Design of a 2.5-Gbps optical transmitter for the International Space Station

Gerry Ortiz, Muthu Jeganathan, John Sandusky, Hamid Hemmati

Proceedings Volume 3615, (1999) https://doi.org/10.1117/12.346177

KEYWORDS: Transmitters, Silicon, Oscillators, Staring arrays, Electronics, Optical amplifiers, Modulation, Optical communications, Data conversion, Space telescopes

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Proceedings Article | 26 April 1999 Paper

Overview of the preliminary design of the Optical Communication Demonstration and High-Rate Link Facility

John Sandusky, Muthu Jeganathan, Gerry Ortiz, Abhijit Biswas, Sukhan Lee, George Parker, Brad Liu, Donald Johnson, Jon De Pew, James Lesh

Proceedings Volume 3615, (1999) https://doi.org/10.1117/12.346178

KEYWORDS: Optical communications, Telecommunications, Telescopes, Space telescopes, Scintillation, Receivers, Atmospheric optics, Optical design, Space operations, Signal attenuation

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Proceedings Article | 26 April 1999 Paper

Upgrade of the Atmospheric Visibility Monitoring system

David Erickson, Donald Tsiang, Muthu Jeganathan

Proceedings Volume 3615, (1999) https://doi.org/10.1117/12.346193

KEYWORDS: Stars, Computing systems, Observatories, CCD cameras, Atmospheric monitoring, Charge-coupled devices, Data processing, Optical filters, Visibility, Atmospheric particles

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Proceedings Article | 26 April 1999 Paper

45-km horizontal-path optical link experiment

Abhijit Biswas, Juan Ceniceros, Matthew Novak, Muthu Jeganathan, Angel Portillo, David Erickson, Jon De Pew, Babak Sanii, James Lesh

Proceedings Volume 3615, (1999) https://doi.org/10.1117/12.346202

KEYWORDS: Telescopes, Surface plasmons, Atmospheric optics, Optical communications, Space telescopes, Charge-coupled devices, Sensors, Mirrors, Avalanche photodetectors, Clocks

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Mountain-top to mountain-top optical link experiments have been initiated at JPL, in order to perform a systems level evaluation of optical communications. Progress made so far is reported. The NASA, JPL developed optical communications demonstrator (OCD) is used to transmit a laser signal from Strawberry Peak (SP), located in the San Bernadino mountains of California. This laser beam is received by a 0.6 m aperture telescope at JPL's Table Mountain Facility (TMF), located in Wrightwood, California. The optical link is bi-directional with the TMF telescope transmitting a continuous 4-wave (cw) 780 nm beacon and the OCD sending back an 840 nm, 100 - 500 Mbps pseudo noise (PN) modulated, laser beam. The optical link path is at an average altitude of 2 Km above sea level, covers a range of 46.8 Km and provides an atmospheric channel equivalent to approximately 4 air masses. Average received power measured at either end fall well within the uncertainties predicted by link analysis. The reduction in normalized intensity variance ((sigma) _I²) for the 4- beam beacon, compared to each individual beam, at SP, was from approximately 0.68 to 0.22. With some allowance for intra-beam mis-alignment, this is consistent with incoherent averaging. The (sigma) _I² measured at TMF approximately 0.43 plus or minus 0.22 exceeded the expected aperture averaged value of less than 0.1, probably because of beam wander. The focused spot sizes of approximately 162 plus or minus 6 micrometer at the TMF Coude and approximately 64 plus or minus 3 micrometer on the OCD compare to the predicted size range of 52 - 172 micrometer and 57 - 93 micrometer, respectively. This is consistent with 4 - 5 arcsec of atmospheric 'seeing.' The preliminary evaluation of OCD's fine tracking indicates that the uncompensated tracking error is approximately 3.3 (mu) rad compared to approximately 1.7 (mu) rad observed in the laboratory. Fine tracking performance was intermittent, primarily due to beacon fades on the OCD tracking sensor. The best bit error rates observed while tracking worked were 1E - 5 to 1E - 6.

Proceedings Article | 26 April 1999 Paper

Lessons learned from the Optical Communications Demonstrator (OCD)

Muthu Jeganathan, Angel Portillo, Caroline Racho, Sukhan Lee, David Erickson, Jon De Pew, Steve Monacos, Abhijit Biswas

Proceedings Volume 3615, (1999) https://doi.org/10.1117/12.346188

KEYWORDS: Charge-coupled devices, Electronics, Digital signal processing, Optical communications, Staring arrays, Mirrors, Fiber coupled lasers, Telescopes, Space telescopes, Optical tracking

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Proceedings Article | 27 May 1998 Paper

Performance analysis and electronics packaging of the optical communications demonstrator

Muthu Jeganathan, Steve Monacos

Proceedings Volume 3266, (1998) https://doi.org/10.1117/12.308715

KEYWORDS: Electronics, Charge-coupled devices, Digital signal processing, Mirrors, Optical communications, Packaging, Interfaces, Fiber coupled lasers, Telescopes, Sensors

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Proceedings Article | 27 May 1998 Paper

Development of the free-space optical communications analysis software

Muthu Jeganathan, G. Stephen Mecherle, James Lesh

Proceedings Volume 3266, (1998) https://doi.org/10.1117/12.308697

KEYWORDS: Excel, Optical communications, Software development, Telecommunications, Free space optical communications, Communication engineering, Transmitters, Databases, Receivers, Modulation

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Proceedings Article | 27 May 1998 Paper

Analysis of data from the Atmospheric Visibility Monitoring (AVM) program

Muthu Jeganathan, Neema Jalali

Proceedings Volume 3266, (1998) https://doi.org/10.1117/12.308708

KEYWORDS: Stars, Databases, Signal attenuation, Visibility, Atmospheric monitoring, Calibration, Atmospheric optics, Earth's atmosphere, Data communications, Atmospheric physics

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Proceedings Article | 24 April 1997 Paper

Data analysis results from the GOLD experiments

Muthu Jeganathan, Morio Toyoshima, Keith Wilson, Jonathan James, Guangshui Xu, James Lesh

Proceedings Volume 2990, (1997) https://doi.org/10.1117/12.273711

KEYWORDS: Scintillation, Satellites, Receivers, Atmospheric optics, Atmospheric modeling, Gold, Satellite communications, Transmitters, Sensors, Telescopes

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Proceedings Article | 24 April 1997 Paper

Overview of the atmospheric visibility monitoring (AVM) program

Muthu Jeganathan, David Erickson

Proceedings Volume 2990, (1997) https://doi.org/10.1117/12.273686

KEYWORDS: Stars, Signal attenuation, Visibility, Atmospheric monitoring, Databases, Earth's atmosphere, Atmospheric optics, CCD cameras, Bandpass filters, Cameras

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Proceedings Article | 24 April 1997 Paper

Progress on the development of the optical communications demonstrator

Tsun-Yee Yan, Muthu Jeganathan, James Lesh

Proceedings Volume 2990, (1997) https://doi.org/10.1117/12.273684

KEYWORDS: Sensors, Charge-coupled devices, Mirrors, Detector arrays, Signal detection, Transmitters, Telescopes, Optical fabrication, Digital signal processing, Optical communications

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Proceedings Article | 1 June 1991 Paper

Spatial acquisition and tracking for deep-space optical communication packages

Chien-Chung Chen, Muthu Jeganathan, James Lesh

Proceedings Volume 1417, (1991) https://doi.org/10.1117/12.43757

KEYWORDS: Receivers, Sensors, Optical tracking, Optical communications, Space operations, Point spread functions, Transmitters, Signal to noise ratio, Spatial resolution, Telecommunications

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Showing 5 of 24 publications

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