WIDE BAND LONG PERIOD GRATING

PROBLEM TO BE SOLVED: To obtain a long period grating having a wide band width by adopting a constitution in which the inclination of the functions of the intervals of perturbations changes code in the region of an operation wavelength. SOLUTION: The grating comprises an optical fiber 10 for transmi...

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Bibliographic Details
Main Authors VENGSARKAR ASHISH MADHUKAR, WAGENER JEFFERSON LYNN, JUDKINS JUSTIN BOYD
Format Patent
LanguageEnglish
Published 14.12.1999
Edition6
Subjects
BASIC ELECTRIC ELEMENTS
DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING
DEVICES USING STIMULATED EMISSION
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
FREQUENCY-CHANGING
NON-LINEAR OPTICS
OPTICAL ANALOGUE/DIGITAL CONVERTERS
OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
OPTICAL LOGIC ELEMENTS
OPTICS
PHYSICS
TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF
TRANSMISSION
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Summary:PROBLEM TO BE SOLVED: To obtain a long period grating having a wide band width by adopting a constitution in which the inclination of the functions of the intervals of perturbations changes code in the region of an operation wavelength. SOLUTION: The grating comprises an optical fiber 10 for transmitting light in a guided (restrained) mode. The fiber 10 has a core 11 and a clad 12 having the refractive index lower than the refractive index thereof. The core 11 includes the long period grating 13 consisting of the plural refractive index perturbations 14 of width of W arranged apart periodic distances (intervals). The wide band long period grating varies in the relation between a wavelength λo and a grating period Λ from the conventional long period gratings. Namely, the grating consists of the plural refractive index perturbations parted by the distance larger than 10λ. The device exhibits the peak coupling wavelength λp changing as the function of the interval Λ of its perturbations and the dΛ/dλp of the function thereof changes the code in the region of the operation wavelength λas an improvement point. The wide band long period grating is so designed as to exhibit an inflection point where dΛ/l 0 is attained at a concern wavelength.
Bibliography:Application Number: JP19990094603