A high-isolation raman wavelength division multiplexer for dts

Abstract

The utility model relates to a kind of optical fiber sensing technology, specifically a kind of high-isolation raman wave division multiplexer for DTS, including first wave division multiplexer, second wave division multiplexer, erbium-doped fiber and 980 / 1550nm fusion taper pumping optical wave division multiplexer;First wave division multiplexer, second wave division multiplexer all include single-fiber collimator and double-fiber collimator, and optical fiber type is multimode OM3 optical fiber;Double-fiber collimator has one optical fiber as same optical fiber, so that there is no fusion point between first wave division multiplexer, second wave division multiplexer;Another optical fiber of the double-fiber collimator of second wave division multiplexer uses erbium-doped fiber, so that there is no fusion point between second wave division multiplexer, erbium-doped fiber;Fusion taper pumping optical wave division multiplexer is completely made using HI 1060 optical fiber fusion taper process, and 980nm and 1550nm wavelength are separated;Erbium-doped fiber other end is fused with fusion taper wave division multiplexer main end;Remaining optical fiber is used for port output / input.

Claims

1. A high-isolation Raman wavelength division multiplexer for DTS, characterized in that, It includes a first multimode wavelength division multiplexer (100), a second multimode wavelength division multiplexer (200), and a fused tapered wavelength division multiplexer (300); Both the first multimode wavelength division multiplexer (100) and the second multimode wavelength division multiplexer (200) integrate dual fiber collimators (110); The dual fiber collimator (110) in the first multimode wavelength division multiplexer (100) and the dual fiber collimator (110) in the second multimode wavelength division multiplexer (200) are connected by a shared multimode fiber (500). The dual fiber collimator (110) in the second multimode wavelength division multiplexer (200) is also connected to one end of an erbium-doped fiber (400), and the other end of the erbium-doped fiber (400) is fused to the main end of the fused tapered wavelength division multiplexer (300).

2. A high-isolation Raman wavelength division multiplexer for DTS according to claim 1, characterized in that, Both the first multimode wavelength division multiplexer (100) and the second multimode wavelength division multiplexer (200) include a dual-fiber collimator (110) and a single-fiber collimator (120), which are fixedly connected by a large glass tube (130).

3. A high-isolation Raman wavelength division multiplexer for DTS according to claim 2, characterized in that, The dual-fiber collimator (110) includes a dual-fiber pigtail (112), a self-focusing lens (113), and a filter array connected in sequence; The filter group includes two identical filters (114), which are attached to each other. A first small glass tube (111) is provided at the end of the dual fiber collimator (110) to connect one end of the inner wall of the large glass tube (130) and the dual fiber collimator (110) as a sealing drum device.

4. A high-isolation Raman wavelength division multiplexer for DTS according to claim 3, characterized in that, The dual-fiber pigtail (112) includes a double-hole capillary tube and an optical fiber. The optical fiber is inserted into the double-hole capillary tube and fixed by adhesive. One end of the dual-fiber tail (112) serves as a tail, and the other end is ground to form an 8° angle and coated with an anti-reflective film; the self-focusing lens (113) is connected to the dual-fiber tail (112) at an 8° angle and at a 0° angle, and both ends are coated with an anti-reflective film.

5. A high-isolation Raman wavelength division multiplexer for DTS according to claim 3, characterized in that, The filter (114) comprises a glass substrate and a multilayer dielectric film, wherein one side of the film is formed as a reflective film and the other side is formed as an antireflective film.

6. A high-isolation Raman wavelength division multiplexer for DTS according to claim 3, characterized in that, The single fiber collimator (120) is connected to a single fiber pigtail (122) and a spherical lens (123). The single fiber pigtail (122) is fixedly connected to the spherical lens (123) through a second small glass tube (121), and the second small glass tube (121) is connected to the other end of the large glass tube (130).

7. A high-isolation Raman wavelength division multiplexer for DTS according to claim 6, characterized in that, The single-fiber pigtail (122) includes a single-hole capillary tube and an optical fiber. The optical fiber is inserted into the single-hole capillary tube and fixed by adhesive. One end of the single-fiber pigtail (122) is a pigtail, and the other end is ground to form an 8° angle and coated with an anti-reflection film. One end of the spherical lens (123) is spherical, and the other end corresponds to the single-fiber tail (122) and forms an 8° inclined plane. Both ends of the spherical lens (123) are coated with anti-reflective coatings.

8. A high-isolation Raman wavelength division multiplexer for DTS according to claim 6, characterized in that, The large glass tube (130), the first small glass tube (111), and the second small glass tube (121) are all made of high borosilicate glass.

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