Tunable optical instruments

A technology of optical instruments and photodetectors, applied in scientific instruments, instruments, optics, etc., can solve the problems of OSA and OCM being bulky, expensive, and slow to adjust.

Inactive Publication Date: 2005-09-14
AEGIS SEMICON
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Conventional OSA and OCM are bulky and expensive because the tunable filters used are mechanically tuned by methods such as moving-grating, elongating-fiber, etc.
This system is also slow to tune, usually taking a few seconds to tune the wavelength by a few nanometers

Method used

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Examples

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Embodiment Construction

[0054] The present invention may be better understood after reading the following detailed description of aspects of various embodiments of the invention when read in conjunction with the accompanying drawings.

[0055] Tunable thin-film filters (TTFFs) are free-space filters that allow light beams, such as collimated light, to enter and filter out a wavelength or set of wavelengths for transmission or reflection. The light beam to be filtered is not guided by waveguides except for the input and output optics which extract the beam from or inject the beam into the waveguide, like an optical fiber.

[0056] exist figure 1 Shown in is a block diagram of an optical instrument 100 including a TTFF 101, such as an OSA or OCM. The TTFF 101 contains semiconductor thin films with large thermo-optic coefficients, resulting in wide tunability without the need for moving parts. Integrated or closely associated with the TTFF 101 are means to heat and / or cool the filter over a wide tempe...

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Abstract

An optical instrument including: a thermo-optically tunable, thin film, free-space interference filter having a tunable passband which functions as a wavelength selector, the filter including a sequence of alternating layers of amorphous silicon and a dielectric material deposited one on top of the other and forming a Fabry-Perot cavity structure having: a first multi-layer thin film interference structure forming a first mirror; a thin-film spacer layer deposited on top of the first multi-layer interference structure, the thin-film spacer layer made of amorphous silicon; and a second multi-layer thin film interference structure deposited on top of the thin-film spacer layer and forming a second mirror; a lens for coupling an optical beam into the filter; an optical detector for receiving the optical beam after the optical beam has interacted with the interference filter; and circuitry for heating the thermo-optically tunable interference filter to control a location of the passband.

Description

technical field [0001] Tunable optical instruments are instruments in which a property of light, such as power level, is measured at more than one wavelength. Such instruments include optical spectrum analyzers (OSAs), optical channel monitors (OCMs) and others used in the field of wavelength division multiplexing (WDM) optical communications and other fields. Background technique [0002] An OSA is a device or a measuring instrument that receives an optical input and produces an output representing the optical power contained in the optical input over a range of wavelengths. When we use the term "optical" or "optical", we mean a wavelength band of electromagnetic radiation, which includes at least visible light, ultraviolet light (UV), and infrared light (IR). We should treat this term inclusively, especially when an application of the above technique covers a clearly named band and also includes adjacent wavelengths outside of these bands. [0003] Like all instruments i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/02G01N21/25G02B5/28G02B6/34G02B6/42G02F1/01G02F1/21
CPCG02B6/29361G02B6/29367G02B6/4214G02B6/4224G02F1/0147G02B6/29395G02F1/0121G02B6/29311G02F2202/103G01N21/251G02F2001/213G02B6/29398G01J3/26G02B6/4246G02F2202/104G02F2203/055G02B6/4204G02B6/4225G02F1/218G02B6/4206G01J3/0286G02B6/29358G02B6/4249G02B6/4215G02B6/4251G02B6/4263G02B6/4266G02B6/4286G02F1/213
Inventor 劳伦斯·多玛施尤金·马罗伯特·穆拉诺尼库雷·尼姆楚克亚当·佩恩史蒂文·谢尔曼玛斯尔斯·瓦格纳吴明(音译)
Owner AEGIS SEMICON
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