Automated measurement of optical coherence lengths and optical delays for applications in coherence-modulated optical transmissions

Gutiérrez‐Martínez, C.; Sánchez‐Rinza, B; Rodrı́guez-Asomoza, J.; Pedraza-Contreras, J.

doi:10.1109/19.836305

Cited by 21 publications

(11 citation statements)

References 8 publications

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“…The coherence lengths of multimode lasers were expected to be in the range 100 m to 500 m, but the interferograms had a number of close-in and distant sidelobes and so a practical value for coherence length was difficult to determine [1].…”

Section: Introductionmentioning

confidence: 99%

“…Low-coherence interferometers and coherence-modulated transmission require the use of low-coherence optical sources [1]. Low temporal-coherence sources such as LEDs or multitransverse (spatial) mode vertical-cavity surface-emitting lasers (VCSELs), can reduce the modal, or speckle, noise that would otherwise occur in multimode fibers when using lasers.…”

Section: Introductionmentioning

confidence: 99%

“…More recently, the coherence length of 1318-nm superluminescent diodes was measured using an automated scanning (1 m steps) Michelson interferometer to be 60 m [1]. The coherence lengths of multimode lasers were expected to be in the range 100 m to 500 m, but the interferograms had a number of close-in and distant sidelobes and so a practical value for coherence length was difficult to determine [1].…”

Section: Introductionmentioning

confidence: 99%

“…T HE TEMPORAL-coherence length of light-emitting diode (LED) optical sources may be used to assess the resolution of low-coherence interferometers, the suitability of the source for use in coherence-modulation communications [1], and the amount of modal, or speckle, noise in multimode fibers [2]. Low-coherence interferometers and coherence-modulated transmission require the use of low-coherence optical sources [1].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Variable numerical-aperture temporal-coherence measurement of resonant-cavity LEDs

Coutinho

Selviah

Oulton

et al. 2003

J. Lightwave Technol.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Variable numerical-aperture temporal-coherence measurement of resonant-cavity LEDs

Coutinho

Selviah

Oulton

et al. 2003

J. Lightwave Technol.

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“…The overlapping of optical path-differences is determined by measuring the optical autocorrelation of the transmitted light when the sensor and demodulator are cascaded [7]. From such a measurement, the interference fringe patterns are registered and are shown in Fig.…”

Section: Electric Field Sensing-detection Using Asymmetric Mach-zehndmentioning

confidence: 99%

Electric field sensors based on optical retarders in lithium niobate (LiNbO3) integrated optics technology

Gutiérrez‐Martínez¹,

Santos-Aguilar²

2017

Opt. Pura Apl.

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Esquemas de sensores de campo eléctrico basados en retardadores ópticos en tecnología de óptica integrada en niobato de litio (LiNbO3)C ABSTRACT:The aim of this paper is to describe the use of Lithium Niobate (LiNbO3) electrooptic retarders as electric field sensors. There are two types of optical retarders that can be implemented on LiNbO3 crystals: birefringent optical waveguides (BOW) and asymmetric Mach-Zehnder interferometers (AMZI). These devices can be used for configuring electric field sensing schemes, taking advantage of their potential of generating practical optical delays. An optical delay becomes practical when its equivalent optical path-difference is longer than the coherence-length of the optical source and ranges between some hundreds of micrometers and some millimeters. This goal can be achieved when using incoherent optical sources as light emitting diodes (LEDs) or super-luminiscent diodes (SLDs) whose coherence-length is around 100 micrometers. In an optical retarder-based electric field sensing scheme, an optical delay can be modulated by the sensed electric field and transmitted to an optical receiver. The demodulation of the optical delay is achieved when a second optical delay is introduced on the received light. The detection of the sensed electric field is ensured only when the sensing and demodulating delays are optically matched. The technique of modulating and demodulating optical delays for the transmission of information signal is more generally known as coherence modulation. The operating principle of the modulation-demodulation of optical delays as well as the use of BOW and AMZI as optical retarders and their use for configuring electric field sensing schemes are describe in this paper.Key words: LiNbO3; electrooptic sensors; optical retarders; optical waveguides; electric field sensing. RESUMEN:El propósito de este artículo es describir la utilización de retardadores electroópticos en niobato de litio (LiNbO3), como sensores de campo eléctrico. Hay dos tipos básicos de retardadores ópticos que pueden realizarse en cristales de LiNbO3: guías de onda ópticas birrefringentes (GOB) e interferómetros Mach-Zehnder asimétricos (IMZA). Estos dispositivos se utilizan para configurar esquemas sensores de campo eléctrico, aprovechando su capacidad de generar retardos ópticos prácticos. Un retardo óptico se vuelve práctico cuando la diferencia de camino óptico equivalente, es superior a la longitud de coherencia de la fuente luminosa. Los valores prácticos varían en un intervalo entre algunos cientos de micrómetros y algunos milímetros. Estos valores pueden alcanzarse cuando se utilizan diodos emisores de luz (DEL) o diodos superluminiscentes (DSL) como fuentes de luz, cuya longitud de coherencia es inferior a 100 micrómetros. En un esquema sensor de campo eléctrico basado en retardador óptico, el retardo es modulado por el campo eléctrico y transmitido hacia un receptor. La demodulación del retardo luminoso se realiza cuando la luz recibida pasa por un segundo retardador que introduce u...

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Electro‐optics

2019

Crystal Optics

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Automated measurement of optical coherence lengths and optical delays for applications in coherence-modulated optical transmissions

Cited by 21 publications

References 8 publications

Variable numerical-aperture temporal-coherence measurement of resonant-cavity LEDs

Variable numerical-aperture temporal-coherence measurement of resonant-cavity LEDs

Electric field sensors based on optical retarders in lithium niobate (LiNbO3) integrated optics technology

Electro‐optics

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