CN2670962Y - Superhigh resoluble dispersion element of light spectrum for intensive wave division complex - Google Patents

Abstract

The invention relates to a spectrum ultra-high resolution dispersion element for dense wavelength division multiplexing, which belongs to a spectrum ultra-high resolution dispersion element involved in the field of spectrum technology. The technical problem to be solved by the utility model is to provide a spectral ultra-high resolution dispersion element for dense wavelength division multiplexing. The technical solution to solve the technical problem is that the utility model includes a modified polycarbonate isosceles right-angle prism and a red-sensitive photopolymer bulk phase holographic Bragg grating. It is a modified polycarbonate isosceles right-angle prism with the red-sensitive photopolymer volume phase holographic Bragg grating as the symmetry axis, and the two sides are symmetrically equipped with a modified polycarbonate isosceles right-angle prism whose bottom edge is in close contact with the red-sensitive photopolymer volume phase holographic grating. Prism-grating compound dispersion element. The compound dispersion element has low cost, easy miniaturization and high resolution, and is suitable for dense wavelength division multiplexing in optical fiber communication systems.

Description

A Spectral Super-Resolution Dispersion Element for Dense Wavelength Division Multiplexing

1. Technical field: The utility model belongs to a spectral ultra-high-resolution dispersive element used for dense wavelength division multiplexing in the field of spectral technology.

2. Technical background: There are basically two types of spectroscopic and dispersive components used in commonly used spectroscopic instruments, namely prisms and gratings. With light waves as the carrier of optical fiber communication, light waves need to be wavelength-division multiplexed at the beginning and end of optical fiber communication, while prisms and gratings are limited by their respective resolutions, and cannot achieve high-density wavelength division in modern optical fiber communication systems. reuse. The closest prior art with the utility model is the prism-grating compound dispersion element that prism and grating are combined together proposed by JAMES ARNS and JAMES TEDESCO of Kaiser Optical System Company of the United States in 2000. As shown in Figure 1, it includes a quartz isosceles rectangular prism 1 and a dichromate gelatin phase holographic grating 2; A prism-grating composite dispersion element composed of two identical quartz isosceles right-angle prisms 1 whose sides are in close contact with a dichromate gelatin phase holographic grating 2. They used this composite dispersion element in a specially designed spectroscopic instrument to achieve high dispersion separation of wavelengths, and pointed out that due to the high spectral resolution of the composite dispersion element, it is expected to be used in dense wavelengths in future optical fiber communication systems. Division multiplexing can not only greatly reduce the number of components in the traditional WDM system, but also greatly reduce the complexity of the system. However, the fundamental problems of the prism-grating composite dispersion element proposed by JAMES are high cost, complex process, and especially difficulty in miniaturization and integration. Multiplexing devices.

3. Summary of the invention: In order to overcome the shortcomings of the existing technology, the purpose of this utility model is to design a miniaturized, low-cost ultra-high-resolution dispersive element suitable for matching with optical fiber communication systems and used as dense wavelength division multiplexing.

The technical problem to be solved by the utility model is to provide a spectrum ultra-high resolution dispersion element for dense wavelength division multiplexing. The technical scheme for solving technical problems is shown in Figure 2, including modified polycarbonate isosceles rectangular prism 3, red-sensitive photopolymer volume phase holographic Bragg grating 4; The polymer volume phase holographic Bragg grating 4 is symmetrical, and the two sides are symmetrically equipped with a prism-grating composed of a modified polycarbonate isosceles rectangular prism 3 whose base is in close contact with the red-sensitive photopolymer volume phase holographic Bragg grating 4 Composite dispersive element.

Explanation of the principle: the parallel light incident parallel to the bottom of the prism passes through the modified polycarbonate isosceles right-angle prism 3 on the upper side and then splits the light through the Bragg reflection generated by the red-sensitive photopolymer volume phase holographic Bragg grating 4. High-resolution wavelength separation is achieved by emitting light beams from the modified polycarbonate isosceles right-angle prism 3 below.

Positive effect, the utility model adopts the polymer-modified polycarbonate material to replace the quartz isosceles rectangular prism, which greatly reduces the cost, improves the dispersion, and is easy to realize miniaturization and integration; it adopts domestic red-sensitive photopolymerization The object phase holographic Bragg grating replaces the dichromate gelatin phase holographic grating, and the He-Ne laser with a wavelength of 632.8nm can be used as the exposure light source instead of the Ar ion laser (with a wavelength of 488.0nm). The equipment is simple and can be operated in a bright room, which simplifies the process and facilitates the operation; moreover, the efficiency, resolution and sensitivity of the red-sensitive photopolymer are better than dichromated gelatin and the cost is low, so the prism-grating we designed and prepared The composite dispersion element is a device suitable for dense wavelength division multiplexing in optical fiber communication systems, and is convenient for large-scale production.

Four, description of drawings: Fig. 1 is the structural representation of prior art, and Fig. 2 is the structural representation of the present utility model.

Five, specific embodiment: the utility model is implemented by the structure shown in Fig. 2, and the polycarbonate material of modification is by cutting, grinding and polishing, and the size of making base is two isosceles right-angled prisms of 10mm, wherein A 25 μ thick red-sensitive photopolymer was spin-coated on the bottom surface of an isosceles rectangular prism, and a volume phase holographic Bragg grating with 1800 lines/mm was made by coherent exposure with a He-Ne laser light source (wavelength λ=632.8nm). Then combine the bottom surface of another isosceles right-angle prism with the above-mentioned isosceles right-angle prism with phase holographic Bragg grating, and seal the surroundings to form bilateral symmetry with the red-sensitive photopolymer bulk phase holographic Bragg grating as the symmetry axis Equipped with a modified polycarbonate isosceles rectangular prism compound dispersion element.

Claims (1)

1, a kind of spectrum super-resolution dispersion element that is used for dense wave division multipurpose, comprise isosceles right-angle prism and body phase hologram grating, it is characterized in that isosceles right-angle prism of the present utility model is the polycarbonate isosceles right-angle prism (3) of modification, body phase hologram grating is a red-sensitive photopolymer body phase hologram Bragg grating (4); This spectrum super-resolution dispersion element, be a kind of be axis of symmetry with red-sensitive photopolymer body phase hologram Bragg grating (4), assembling to symmetria bilateralis the prism one grating compound dispersion element that the polycarbonate isosceles right-angle prism (3) of the modification that base and red-sensitive photopolymer body phase hologram Bragg grating (4) closely contact is formed.