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Single-mode continuous tunable optical filter

A technology of optical filters and Perot filters, applied in optics, optical components, nonlinear optics, etc., can solve difficult problems and achieve the effects of easy installation and production, small size, stable and reliable performance

Inactive Publication Date: 2012-11-28
GP PHOTONICS INC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

If the free spectral range is to be increased, the thickness of the Fabry-Perot etalon must be reduced. For example, for a light wave of 1500 nm, if ordinary fused silica glass is used, the corresponding thicknesses of the free spectral ranges of 100 GHz and 1000 GHz are respectively About 1 mm and 0.1 mm, so it is actually very difficult to achieve even a free spectral range of 1000 GHz, let alone a larger free spectral range

Method used

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  • Single-mode continuous tunable optical filter

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Embodiment Construction

[0029] Embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings.

[0030] figure 1 is a schematic diagram of a common Fabry-Perot optical etalon 100 . The material of the Fabry-Perot optical etalon 100 generally adopts optical glass such as fused silica or BK7 in the near-infrared and visible light bands. Assuming that the refractive index of the material is n, the two light-transmitting surfaces 2 and 4 are all coated with high Reflective film, assuming that the reflectivity is R, the thickness is h, and the light is incident at an incident angle close to zero, then the free spectral range FSR of the optical etalon 100 can be expressed as: Δλ=λ 2 / (2nh), or expressed in frequency: Δν=c / (2nh), where c is the speed of light. The peak frequency of transmitted light can be expressed as: ν=mc / (2nh), where m is the interference order, and the frequency broadband of transmitted light can be expressed as: Δν 1 / 2 (...

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Abstract

The invention relates to a single-mode continuous tunable optical filter which is mainly, technically characterized by comprising two transmission frequency Fabry-Perot tunable filters which are oppositely arranged back and forth, when the free spectral range of a first transmission frequency Fabry-Perot tunable filter is different from the intrinsic free spectral range of a second transmission frequency Fabry-Perot tunable filter at a certain interval, the transmission frequency tunable characteristic of the two transmission frequency Fabry-Perot tunable filters is utilized, so the tunable single-mode output is realized within a certain spectral range. The single-mode continuous tunable optical filter is reasonable in design, has the characteristics of no mechanical moving parts, stable and reliable performance, simple structure, low cost, small size, easiness for installation and production and the like, can meet the required small dimensions and reliable operation under extreme working environments, and can be widely applied in the fields of laser, optical test, optical fiber communication, biology, medical appliance, optical fiber sensor network and the like.

Description

technical field [0001] The invention belongs to the field of optoelectronics, in particular to a single-mode continuous tunable optical filter. Background technique [0002] The traditional optical Fabry-Perot etalon is a filter device made by using the principle of multi-beam interference. There are two main types: one is spaced by air, and the other is spaced by optical glass. Through the multi-beam interference effect of the Fabry-Perot cavity formed by the high reflectivity of the multi-layer dielectric film on the two light-passing surfaces, the multi-wavelength narrow-band filter output in a wide spectrum range can be realized, with stable performance and light-passing Due to the characteristics of large aperture, high optical power destruction threshold, simple structure and low cost, it is widely used in various lasers, optical measuring instruments and optical fiber communication devices. The frequency tuning of the transmitted light can also be achieved by using a...

Claims

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Application Information

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IPC IPC(8): G02F1/13
CPCG02B5/28G02F1/13G01J3/26G02B5/284
Inventor 高培良
Owner GP PHOTONICS INC
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