CN100427983C - Combiner and demultiplexer synthesized by micro-insertion-loss strong-coupling fiber grating group and its manufacturing method - Google Patents

Abstract

The "multiplexer and demultiplexer synthesized by micro-insertion-loss strong-coupling fiber grating groups" of the present invention is composed of a plurality of strong-coupling fiber grating groups of different wavelengths connected in series. This kind of strong coupling fiber grating group is made by using a phase mask for double-core fiber and using a laser with a wavelength of 248nm. The insertion loss is less than 1dB, and strong coupling fiber gratings of different wavelengths can be carved by using phase masks with different periods. Group. Different combinations of these fiber grating groups can be made into multiple wavelength multiplexers and wave splitters. The cost of the "multiplexer and demultiplexer synthesized by micro-insertion-loss strong-coupling fiber grating groups" of the present invention is one order of magnitude lower than that of the current array waveguide multiplexer and demultiplexer, and the economic and social benefits are very significant.

Description

Combiner and demultiplexer synthesized by micro-insertion-loss strong-coupling fiber grating group and its manufacturing method

technical field

The "wavelength multiplexer and demultiplexer synthesized by micro insertion loss strong coupling fiber grating group and its manufacturing method" manufactured by the present invention belongs to the technical field of wavelength division multiplexing optical fiber communication and sensing system, and is especially suitable for the wavelength of multiplexer and demultiplexer The technical field of optical fiber communication and sensing system whose number can be increased or decreased according to demand.

Background technique

Multiplexer and demultiplexer is an important component of optical fiber communication and optical fiber sensing system. There are two types of multiplexers and splitters currently used in the world. One is a multiplexer and splitter with multi-layer precision coating. The manufacturing equipment is very expensive, and the processing process is very complicated, so the price of this combiner and splitter is very expensive. An 8×1 multiplexer and a 1×8 splitter cost $8,000, and up to 32×1 and 1×32 splitters cost more than $30,000, and each combiner The insertion loss of wave and split wave is 2~4dB respectively, and the total insertion loss of combined wave and split wave is 4~8dB. The other is the arrayed waveguide multiplexer and demultiplexer, which can achieve 32-80 wavelengths at present, and the insertion loss of each multiplexer and demultiplexer is 5-7dB. The total insertion loss of the multiplexer and demultiplexer is 10-14dB. , it is almost necessary to add an optical amplifier to compensate for its insertion loss. The 32-channel multiplexer/demultiplexer costs about $3,000, but in order to compensate for the insertion loss of the multiplexer/demultiplexer, an optical amplifier needs to be added, which costs about $2,000, so the total cost is $5,000. wave splitter. Both of the above two multiplexing and demultiplexing devices cannot be arbitrarily increased or decreased by the user. Therefore, it is urgent to develop a low-cost micro-insertion loss that can be arbitrarily combined according to the number of wavelengths required by the user. oscilloscope.

Contents of the invention

In order to overcome the deficiencies of the above-mentioned prior art, the present invention provides a multiplexer and demultiplexer synthesized by micro-insertion-loss strong-coupling fiber grating groups and a manufacturing method thereof.

The technical scheme that the present invention solves technical problem adopts is:

A wavelength multiplexer and demultiplexer synthesized by strong coupling fiber grating groups with micro insertion loss is characterized in that: it is composed of a plurality of strong coupling fiber grating groups with different wavelengths connected in series, and the strong coupling fiber grating group is composed of two core fibers A phase mask is carved by a laser with a wavelength of 248nm, and its insertion loss is less than 1dB.

One of the features is that the strongly coupled fiber grating group is made of a double-core photosensitive fiber or an ordinary double-core fiber that is hydrogen-loaded and carved into a strong-coupled fiber grating group by using a fiber grating phase mask and a 248nm laser.

One of the characteristics, the manufacturing method of the multiplexer and demultiplexer synthesized by the micro insertion loss strong coupling fiber grating group, contains the following steps: firstly, two preformed rods with photosensitive properties are made, and the two preformed rods are ground into a cross-sectional shape If it is D type, put the two D-type preforms into the casing symmetrically, or add quartz wire for filling to make a high-quality dual-core optical fiber preform, and then draw it into a dual-core optical fiber by a wire drawing machine , where each fiber is single-mode.

One of the features is that it is used to make a phase mask for micro insertion loss strong coupling fiber grating, and its effective width is 9-12mm.

One of the features, the multiplexer and demultiplexer synthesized by the micro-insertion-loss strong-coupling fiber grating group, the number of wavelengths for multiplexing and demultiplexing is 4 to 80 wavelengths.

The cost of the "multiplexer and demultiplexer synthesized by micro-insertion loss strong coupling fiber grating groups" of the present invention is an order of magnitude lower than that of the current array waveguide multiplexer and demultiplexer, and the economic and social benefits are very significant.

Description of drawings

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

Figure 1 is a schematic diagram of the structure of a micro-insertion-loss strong-coupling fiber grating group.

Fig. 2 is a structural schematic diagram of a multiplexer synthesized by a micro-insertion-loss strong-coupling fiber grating group.

Fig. 3 is a structural schematic diagram of a wave splitter synthesized by a micro-insertion-loss strong-coupling fiber grating group.

Detailed ways

Embodiment 1;

The "multiplexer and demultiplexer synthesized by micro-insertion-loss strong-coupling fiber grating groups" of the present invention is composed of 4 to 80 strong-coupling fiber-bragg grating groups of different wavelengths connected in series, wherein the specific number of strong-coupling fiber-bragg grating groups used is given by The actual use requirements are determined. This strongly coupled fiber grating group is made by using a phase mask for dual-core optical fibers and using a laser with a wavelength of 248nm. The insertion loss is less than 1dB, as shown in Figure 1. Strongly coupled fiber grating groups with different wavelengths can be carved by using phase masks with different periods. Different combinations of these fiber grating groups can be made into multiplexers and demultiplexers with 4 to 80 wavelengths, as shown in Figures 2 and 3.

To develop a strong coupling fiber grating group, it is first necessary to develop a new type of phase mask. The current general phase mask has an effective width of 3mm, but the effective width of this new type of phase mask needs to be increased by 3 to 4 times.

In order to develop a strong coupling fiber grating group, it is also necessary to develop a double-core fiber. The dual-core optical fiber can be a dual-core photosensitive optical fiber, or an ordinary dual-core optical fiber that is hydrogen-loaded and carved into a strongly coupled fiber grating group by using the above-mentioned fiber grating phase mask and a 248nm laser.

Embodiment 2;

1 The core component of the present invention is the fiber grating group with strong coupling. The optical fiber grating group is made by using the same phase mask plate of the double-core optical fiber and is carved by a laser with a wavelength of 248nm, and its insertion loss is less than 1dB.

2 The effective width of this new type of phase mask needs to be 3 to 4 times larger than the current mask. Made of plastic, engraved quartz, and phase mask.

3 Development of dual-core optical fiber. First make two preforms with photosensitive properties, grind the two preforms into D shape, then put the two D shape preforms into the casing symmetrically, and add quartz silk for filling if necessary. A high-quality dual-core optical fiber preform is drawn into a dual-core optical fiber by a wire drawing machine. Each of these fibers is single-mode.

4. Use common optical fibers 1, 2, 3, and 4 to connect the above-mentioned dual-core optical fibers into a strongly coupled fiber grating group, as shown in Figure 1.

5. A multiplexer with any number of wavelengths can be formed by connecting strongly coupled fiber grating groups of different wavelengths in series, as shown in Figure 2. Here, the optical fiber 5 is connected to the input signal, and the optical fiber 6 is connected to the signal that needs to be combined, then the output of the optical fiber 7 is the composite signal of the input signals of the optical fibers 5 and 6, and the optical fiber 8 is suspended. Repeatedly connecting strongly coupled fiber grating groups of different wavelengths in series, the required multiplexer is produced. A wave splitter with any number of wavelengths can also be formed by connecting strongly coupled fiber grating groups of different wavelengths in series, as shown in Figure 3. Here, the optical fiber 9 is connected to the input signal, and the optical fiber 10 is suspended, then the output of the optical fiber 11 is the signal after the wavelength is removed by the strongly coupled fiber grating component from the input signal of the optical fiber 9, and the output of the optical fiber 12 is the separated wavelength signal. Repeatedly connecting strongly coupled fiber grating groups of different wavelengths in series, the required wave splitter is produced.

Claims (5)

1. A wavelength multiplexer and demultiplexer composed of strong coupling fiber grating groups with micro insertion loss, characterized in that: it is formed in series by a plurality of strong coupling fiber grating groups of different wavelengths, and the strong coupling fiber grating group is composed of a double-core optical fiber It is made by using the same phase mask board with a laser with a wavelength of 248nm, and its insertion loss is less than 1dB. 2. The multiplexer and demultiplexer synthesized by a micro-insertion-loss strong-coupling fiber grating group according to claim 1, wherein the strong-coupling fiber grating group is composed of a double-core photosensitive fiber or an ordinary double-core fiber through hydrogen After loading, use a fiber grating phase mask and a 248nm laser to make a strong coupling fiber grating group. 3. The manufacturing method of the dual-core optical fiber for the multiplexer and demultiplexer synthesized by the micro insertion loss strong coupling fiber grating group according to claim 1, which is characterized in that it contains the following steps: firstly, two fibers with photosensitive properties are made. Grind the two preforms into a D-shaped cross-sectional shape, and then put the two D-shaped preforms into the casing symmetrically, or add quartz wire for filling to make a high-quality double core The optical fiber preform is drawn into a double-core optical fiber by a wire drawing machine, and each optical fiber is single-mode. 4. According to claim 1 or 2, a phase mask used for making a strong coupling fiber grating in a multiplexer and demultiplexer composed of a micro insertion loss strong coupling fiber Bragg grating group, is characterized in that the phase mask The effective width is 9-12mm. 5. A multiplexer and demultiplexer composed of micro-insertion-loss strong-coupling fiber grating groups according to claim 1 or 2, characterized in that the number of wavelengths for multiplexing and demultiplexing is 4 to 80 wavelengths.

Images