公开(公告)号：EP1488258A1

公开(公告)日：2004-12-22

申请号：EP03708768.1

申请日：2003-03-03

Applicant: Andor Technology Limited

Inventor： LINDBLOM, Peter

IPC: G02B5/18 ,  G01J3/18

CPC classification number: G01J3/16 ,  G01J3/0259 ,  G01J3/18

Abstract: Methods and systems for carrying out the distribution of light in a ray pathway (21) into wavelength components (21 - 27) comprising optical elements (10, 11) of the diffraction grating type that diffract the said light into several spectral orders (m). The invention is characterised in that at least two diffraction grating surfaces are placed sequentially in the ray pathway whose orientations and grating constants are selected such that the wavelength components that are diffracted at the grating surfaces into the respective orders, whose sum (M = m1 + m2) is constant, emerge from the last grating surface (11) in essentially the same direction.

公开(公告)号：EP1373843A1

公开(公告)日：2004-01-02

申请号：EP02701835.7

申请日：2002-02-21

Applicant: Andor Technology Limited

Inventor： LINDBLOM, Peter

IPC: G01J3/18 ,  H04J14/02

CPC classification number: G01J3/12 ,  G01J2003/1828 ,  H04J14/0227

Abstract: The invention concerns a system for obtaining characteristic spectral information of light emitted from an optical fibre (10). The system comprises an optical spectrograph (12, 13, 14, 15) and a detector (16, 17). The spectrograph comprises a diffraction grating (13) that diffracts light in the wavelength band 800 - 1,700 nm, or parts thereof, into spectral orders in one plane of spreading, and a wavelength dispersing means (14) that spreads the wavelength components in a plane of spreading that is perpendicular to the first plane of spreading. A digital camera (17) with a detector surface (16) records the images of the light, and a computer (19) converts the signals into a spectrum and calculates magnitudes that are characteristic of the optical fibre (10), for a light source (21) that illuminates the fibre and/or for other electro-optical components that are used in optical telecommunication.