Adjustable optical filter and method for making same

A manufacturing method and filter technology, which can be used in instruments, light guides, optics, etc., and can solve problems such as insufficient coverage of channel bandwidth.

Inactive Publication Date: 2004-11-10
ALCATEL USA SOURCING
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  • Summary
  • Abstract
  • Description
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Problems solved by technology

However, current implementations, such as acousto-optic fiber Bragg gratings and piezoelectric Bragg gratings, only allow tuning in the range of a few nanometers (approximately about 5 or 6 channels)
Obviously, this tuning range is not enough to cover the channel bandwidth of the advanced DWDM system mentioned above

Method used

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  • Adjustable optical filter and method for making same
  • Adjustable optical filter and method for making same
  • Adjustable optical filter and method for making same

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[0030] In the drawings, identical or similar components are denoted by the same reference numerals, and the depicted components are not necessarily drawn to scale. Referring now to FIG. 1 , depicted is a Fiber Bragg Grating (FBG) component 102 disposed in an optical coupler structure illustrating the wavelength selective properties of the FBG component 102 . As is well known, a fiber Bragg grating is a length of selected length of optical fiber that has been modified to have a refractive index that varies periodically along the length. This spatial periodicity of the refractive index is often referred to as the grating pitch. Depending on the spacing between the changes (ie, the grating pitch), light of a certain frequency—the Bragg resonance wavelength—is reflected back, while light of all other wavelengths passes through the fiber.

[0031]Four ports are illustrated in the optocoupler structure shown in FIG. 1 : two input ports, port A 104A and port D 104D, and two output p...

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Abstract

An optical filter having a wide tuning range and a method of making the same. A fiber Bragg grating member having a selected grating pitch is coupled to a plurality of actuating members such as Shape Memory Alloys. A current source or thermal source is included for providing a controlled amount of current or heat so as to cause a change in the length of the actuating members. The length of the fiber Bragg grating member is accordingly changed also. The grating pitch is correspondingly altered, thereby causing a change in the Bragg resonance wavelength of the grating. In response, a reflected optical signal selected from incoming multiplexed optical signals tunes to a different wavelength.

Description

technical field [0001] The present invention relates to optical network components and, more particularly, to fiber Bragg grating filters (FBGF) with wide tuning range and methods of making fiber Bragg grating filters using shape memory alloys. Background technique [0002] As networks face increasing bandwidth requirements and diminishing availability of fiber in existing fiber optic plants, network providers are turning to a new network technology called optical networking. An optical network is a high-capacity telecommunications network constructed of optical and optoelectronic technologies and components, and provides wavelength-based services in addition to wavelength-level signal routing, shaping and restoration. These networks, based on the emergence of so-called optical layers that operate entirely in the optical domain in the transport network, are not only capable of supporting exceptionally large capacities (up to terabits per second (Tbps)) , interactive video-o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B6/00G02B5/18G02B6/34G02B26/00
CPCG02B6/022G02B6/02204
Inventor 劳伦斯·E·福尔泽
Owner ALCATEL USA SOURCING
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