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Low polarization-related loss optical filter with adjustable wavelength in a wide range

An optical filter and related loss technology, which is applied in optics, nonlinear optics, instruments, etc., can solve the problem that the tunable filter cannot work, and achieve the effect of low polarization related loss, low cost, and good channel isolation

Active Publication Date: 2008-06-04
PRIMANEX (CHINA) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] In order to overcome the disadvantage that the above-mentioned traditional tunable filter that adopts the method of rotating the optical film filter to realize wavelength adjustment cannot work at a large incident angle, the present invention provides a wide range of wavelength adjustable filter with low polarization-dependent loss. tuning optical filter

Method used

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  • Low polarization-related loss optical filter with adjustable wavelength in a wide range
  • Low polarization-related loss optical filter with adjustable wavelength in a wide range
  • Low polarization-related loss optical filter with adjustable wavelength in a wide range

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Embodiment Construction

[0026] Figure 7are top and side views of an optical schematic according to a specific embodiment of the present invention. The tunable filter consists of three functional modules. The first module is a fiber collimation coupling module, including a dual-core optical fiber (100) and a lens (101); the second module is a polarization processing module, including a first birefringent crystal (102), a two-in-one half wave plate (103), first Faraday rotator (104), two wedge prisms (105A and 105B), second birefringent crystal (106), second Faraday rotator (107) and a half-wave sheet (108); the third functional module is a wavelength adjustment module, including an optical film filter (109) and a plane reflector (110).

[0027] exist Figure 7 In , the input light is represented by a solid line, and the return light is represented by a dotted line; a short solid line is marked on the input light to indicate that the light is in the P-polarization state, and a solid circle is marke...

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Abstract

It is a wavelength-adjustable optics filter, which comprises fiber calibration couple module, polarization process module, optics thin film and plane reflection lens. It provides the total linear polarization beam through fiber calibration couple module and polarization process module to the optics thin film filter and then rotate the optics thin film filter to realize the adjusting functions of wavelength. The light path design adopts double-pass style, which comprises front and back beams in light path transmission.

Description

Technical field: [0001] The invention relates to a wavelength tunable optical filter, in particular to a tunable optical filter based on an optical multilayer thin film. Background technique: [0002] Wavelength tunable optical filter is a key element in dense wavelength division multiplexing (DWDM) optical network, because its response wavelength can be adjusted within a certain range, so it can be applied to single channel in dense wavelength division multiplexing optical transmission system Solution, dynamic wavelength selection in wavelength division multiplexing systems using ADD / DROP or wavelength conversion, and suppression of stimulated spontaneous emission of optical signals, etc. The core component in the tunable filter is a bandpass filter, which can selectively pass a part of the wavelengths of the incident beam and reflect the rest of the wavelengths. The more commonly used bandpass filter generally chooses Fabry-Perot type multi-resonator optical film; the inc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B6/26G02F1/01H04J14/02
Inventor 赵强向强盛
Owner PRIMANEX (CHINA) CO LTD
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