Wavelength dispersing device

a technology of dispersing device and wavelength, which is applied in the direction of optical radiation measurement, instruments, spectrometry/spectrophotometry/monochromators, etc., can solve the problems of t-dg b>31/b> creating multiple reflections, causing optical cross-talk deleterious, and more problematic optical aberrations

Inactive Publication Date: 2009-11-05
JDS UNIPHASE CORP
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

As the beam NA becomes larger, optical aberrations become more problematic.
One drawback of the approach represented by FIG. 3 is that the T-DG 31 creates multiple reflections as a result of the diffraction occurring both in reflection and transmission directions.
As a result of these multiple reflections, multiple stray light beams are created, resulting in deleterious optical cross-talk.

Method used

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  • Wavelength dispersing device
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Embodiment Construction

[0043]While the present teachings are described in conjunction with various embodiments and examples, it is not intended that the present teachings be limited to such embodiments. On the contrary, the present teachings encompass various alternatives, modifications and equivalents, as will be appreciated by those of skill in the art.

[0044]According to the present invention, one approach to reducing size of a wavelength dispersing device and a WSS based thereupon is to scale down the entire device, that is, reduce the focal length of a focusing coupler such as a concave mirror, while positioning optical elements off-axis when required for more compact device construction. Reduction of the focal length and, or off-axis construction is accompanied by increasing NA of the light beams and at the same time correcting for optical aberrations which, as has been explained before, have a tendency to increase with increased NA of the light beams. An aberration correcting approach of the present...

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Abstract

A compact wavelength dispersing device and a wavelength selective optical switch based on the wavelength dispersing device is described. The wavelength dispersing device has a folding mirror that folds the optical path at least three times. A focal length of a focusing coupler of the device is reduced and the NA is increased, while the increased optical aberrations are mitigated by using an optional coma-compensating wedge. A double-pass arrangement for a transmission diffraction grating allows further focal length and overall size reduction due to increased angular dispersion.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]The present invention claims priority from U.S. Provisional Patent Application No. 61 / 071,510, filed May 2, 2008 and U.S. Provisional Patent Application No. 61 / 129,136, filed Jun. 6, 2008, which are incorporated herein by reference.TECHNICAL FIELD[0002]The present invention relates to wavelength dispersing devices, and in particular to free-space optics based compact wavelength dispersing devices for use in wavelength selective optical switches and optical spectrometers.BACKGROUND OF THE INVENTION[0003]A wavelength dispersing device is an optical device for spatially separating spectral components of light for subsequent measurements and, or for further routing or switching of these spectral components.[0004]A wavelength dispersing device is a key component of an apparatus for measuring a spectrum of light, or an optical spectrometer. Optical spectrometers are used for remote sensing of temperature, determining chemical composition and co...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G02B5/18
CPCG01J3/02G01J3/0205G01J3/0208G01J3/021G01J3/0243G01J3/0256G02B5/1866G01J3/1804G01J3/22G02B5/1809G02B6/2931G02B6/29311G01J3/0291G02B6/2938G02B5/12G02B5/1814G02B6/29313G02B6/354G02B17/0856G02B2005/1804
Inventor MCLAUGHLIN, SHELDON
Owner JDS UNIPHASE CORP
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