Kapany Narinder Singh

Bio: Kapany Narinder Singh is an academic researcher. The author has contributed to research in topics: Optical fiber & Dichroic glass. The author has an hindex of 1, co-authored 1 publications receiving 9 citations.

Fiber optics couplers

Abstract: An optical fiber demultiplexer comprises first (325b) and second (325c) ports located in the focal plane of a first spherical reflective surface (313) such that light at one port is focused on the other. A second spherical reflective surface (315) which is dichroic is located between the ports and the first spherical surface and has a focal plane common with that of the first spherical surface. A third port (325a) is located in the common focal plane such that light from the first port of the frequency reflected by the dichroic surface is focused at the third port (325a).

Wavelength multiplexer-demultiplexer corrected for geometric and chromatic aberrations

Abstract: Multiplexeur-demultiplexeur comprenant: a) un element porte-fibres (1) dans lequel sont noyees les fibres d'entree et de sortie (9) avec leurs extremites affleurant sur une surface plane de contact (12) avec l'element suivant, b) un element (2) portant le systeme de separation de longueurs d'ondes (15), avec une surface plane de contact avec l'element porte-fibres et une face plane opposee de contact avec l'element suivant, c) un element intermediaire (3) de meme indice n que l'element portant le systeme de separation de longueurs d'ondes, avec une face plane de contact (23) avec l'element portant le systeme de separation de longueurs d'ondes, et une face spherique de contact (34) avec l'element suivant, d) un element miroir (4) avec une face spherique de contact avec l'element intermediaire et une face spherique opposee traitee pour constituer un miroir spherique concave (8) vers l'element intermediaire.

Fiber optic isolator for use with multiple-wavelength optical signals

Abstract: A fiber optic isolator device is used by fiber optic systems operating at more than one wavelength. The device may be inserted anywhere within the fiber network. The fiber optic device permits the separation of the wavelengths so that an optical isolator module can isolate a first wavelength without significantly affecting the second wavelength. This device is useful isolating a communications signal at 1.55 μm while avoiding significant losses for an optical time domain reflectometry signal, for example at 1.3 μm.

Fiber optic device operating at two or more wavelengths

Abstract: A fiber optic device is used by fiber optic systems that operate with light at more than one wavelength. The device may be inserted anywhere within the fiber network. The fiber optic device permits the separation of the wavelengths so that an optical device can operate on that separated wavelength without operating on the other wavelength or wavelengths. The different wavelengths may then be recombined. In another embodiment, different wavelengths may be combined into a single fiber, with an optical device being disposed to operate on one of the wavelengths.

Apparatus for optically coupling light guides

Abstract: Dispositif de couplage optique entre d'une part un guide d'onde lumineuse d'extremite W transportant un nombre N de signaux de longueurs d'onde differentes et d'autre part N guides d'onde lumineuse d'extremite W 1 , W 2 ,...W N transportant chacun un de ces signaux, comportant des moyens pour obtenir une selection spectrale de ces signaux incluant un separateur d'ondes a filtres interferentiels, et des moyens pour obtenir une selection spatiale de ces signaux de maniere a realiser le couplage. An optical coupling device between firstly a W end of optical waveguide carrying a number N of different wavelength signals and the other N light waveguide end W 1, W 2 , ... W N each carrying one of these signals, comprising means for obtaining a spectral selection of said signals including a wave separator interference filters, and means for obtaining a spatial selection of said signals so as to produce the coupling. Ce dispositif est remarquable en ce que les extremites W, W 1 , W 2 ,...W N etant placees dans un meme plan P, ces moyens sont constitues de N surfaces spheriques situees les unes derrieres les autres, dont les (N-1) premieres par rapport au plan P sont munies respectivement de l'un desdits filtres interferentiels permettant la reflexion de l'un des signaux et la transmission des autres, dont la plus eloignee du plan P est, soit totalement reflechissante, soit un filtre interferentiel, dont les centres optiques respectifs C 1 , C 2 ,...C N sont situes dans le plan P au milieu des segments definis par l'extremite W et respectivement l'une des extremites W 1 , W 2 ,...W N . Said device is characterized in that the ends W, W 1, W 2, ... W N is placed in the same plane P, these means comprise N spherical surfaces situated one behind the other, the (N- 1) first to the plane P are provided with one of said interference filters for reflection of one of the signals and the transmission of the other respectively, the most remote from the plane P is either totally reflecting or an interference filter , whose respective optical centers C 1, C 2, ... C N are situated in the plane P in the middle of the segments defined by the W end and one end respectively, W 1, W 2, ... W N. Application: Multiplexage et demultiplexage en telecommunication. Application: multiplexing and demultiplexing in telecommunications.