CN2440290Y - Close-wave-dividing shared device - Google Patents

Abstract

The utility model relates to a close-wave-dividing shared device (DWDM), which comprises a double optical-fiber collimator, a prism, a close-wave-dividing shared device diaphragm, and a single optical fiber collimator, wherein, the prism refracts light transmitted out from one port of the double optical-fiber collimator to the close-wave-dividing shared device diaphragm at a specific angle; the close-wave-dividing shared device diaphragm permeates the required single ITU wavelength light; the part of permeated light is received by the single optical fiber collimator. The close-wave-dividing shared device diaphragm simultaneously reflects the light of other wavelength; the reflected light is received by the other port of the double optical-fiber collimator. The prism can be replace with a pair of wedge angle pieces, and can also be replaced with a component formed by that the other wedge angle piece is added in front of the prism or the pair of wedge angle pieces. The close-wave-dividing shared device has the advantages of smaller structure and easy operation.

Description

Dense wave division multiplexer

The utility model belongs to optical communication field, refers in particular to a kind of dense wave division multiplexer (DWDM).

An important feature of dense wave division multiplexer diaphragm is along with incident light is different with diaphragm normal angle θ, the also corresponding difference of its transmitted light wavelength.General transmitted light wavelength can be expressed with this relational expression: $\mathrm{\λ}={\mathrm{\λ}}_0\sqrt{1-c\·{\sin }^2\mathrm{\θ}}$ , λ wherein ₀For θ=0 o'clock sees through centre wavelength C be and transmission peak wavelength and transmission band form and aspect pass coefficient.But in fact owing to technology or other reason of plated film, even from the fritter matrix of the zones of different that cuts down with a bulk of matrix, when light incided on these fritter matrixs respectively with identical incidence angle, its transmission peak wavelength was also not necessarily consistent.In practical operation, in order to obtain required ITU transmission peak wavelength (being communication wavelengths), we usually need to change incident light and incide angle on the diaphragm.At present, solve this class problem following several common scheme arranged:

(1) patent No. is the United States Patent (USP) (as shown in Figure 1) of US5808763, regulates collimater 11, makes the light beam 18 that sends and the normal of dense wave division multiplexer diaphragm 13 become a special angle θ ₁, make that just seeing through the ITU wavelength is λ ₁Light 16, the collimated device of the light of this wavelength 15 receives.The light 19 of dense wave division multiplexer diaphragm reflection is by a speculum 12 reflections, and accommodation reflex mirror 12 makes 13 one-tenth another angles of light 110 and dense wave division multiplexer diaphragm θ of mirror reflects ₂, see through wavelength this moment is λ ₂Light 17, the collimated device of the light of this wavelength 14 receives to be penetrated light to multi-wavelength λ and adopts this structure separated up to all wavelengths repeatedly.

(2) scheme is the another kind of scheme of dense wave division multiplexer (DWDM) below.

As shown in Figure 2, directly regulate dense wave division multiplexer diaphragm face 22, make the normal of the light beam 25 that sends from collimater 21 and diaphragm 22 θ that has angle ₃, the ITU wavelength of transmission this moment is λ ₁The collimated devices 23 of light 26 receive, the light 27 collimated devices 24 of reflection receive.Also can before collimater 24, add another filtering (Filter) sheet, and rotate filtering (Filter) sheet, make it another ITU wavelength X of just transmission ₂, the ITU wavelength of transmission is λ ₂The collimated device of light 24 receive, the light of this Filter sheet reflection is received by another collimater.Add the Filter sheet so repeatedly until separating all ITU wavelength.

More than two kinds of schemes, though realized effectively the ITU wavelength separately, only be suitable for the single fiber collimater on the structure, and need that correspondingly volume is also bigger.

(3) also adopt following a kind of scheme (as shown in Figure 3) now sometimes.The collimater 37 that adopts the GRIN Lens 32 of two optical fiber capillaries 31 of different interval and 0.25Pitch (pitch) to make, and filtering (Filter) sheet directly is attached to GRIN Lens 32 surfaces (among the figure amplify come picture with double-fiber collimator).This scheme utilizes the angle of departure difference of the double-fiber collimator 37 that two optical fiber capillaries of different interval are given birth to select the ITU wavelength of Filter sheet transmission.Though this scheme structure is small and exquisite, owing to can only and in practical operation, need often to change two optical fiber capillaries of different interval or the double-fiber collimator of doing with two optical fiber capillaries of different interval, so operate more loaded down with trivial details with the GRIN Lens of 0.25 joint.

It is big at interval between a kind of pair of optical fiber that the purpose of this utility model is to provide, and structure is little, easy to operate dense wave division multiplexer.

The utility model is by double-fiber collimator, prism, a DWDM diaphragm, and the optical fiber collimator composition, and double-fiber collimator is made of two optical fiber capillaries and lens, and double-fiber collimator light exit side mouth position is provided with prism and diaphragm.

After adopting above structure, the utlity model has compact conformation, the advantage of easy operating.

Now reach accompanying drawing in conjunction with the embodiments and do a detailed description:

Fig. 1 patent No. is the United States Patent (USP) structural representation of US5808763.

The another kind of background technology structural representation of Fig. 2 the utility model.

Another background technology structural representation of Fig. 3 the utility model.

Fig. 4 the utility model embodiment 1 structural representation.

Fig. 5 the utility model embodiment 2 structural representations.

Fig. 6 the utility model embodiment 3 structural representations.

Fig. 7 the utility model embodiment 4 structural representations.

Fig. 8 the utility model embodiment 5 structural representations.

Fig. 9 the utility model embodiment 6 structural representations.

The dense wave division multiplexer that the utility model adopts, thus add that in light path prism or angle of wedge sheet incide the ITU wavelength that angle selective transmission on the dense wave division multiplexer diaphragm is crossed the dense wave division multiplexer diaphragm to change light beam.

Embodiment 1 (as shown in Figure 4), double-fiber collimator 47 is made up of two optical fiber capillaries 41 and lens (Lens) 42.The light 49 of 47 1 port 48 outgoing of double-fiber collimator is refracted to dense wave division multiplexer diaphragm 44 through prism 43, and the prism of selecting different angles incides angle on the dense wave division multiplexer diaphragm to change deflecting light beams 46, thus the ITU wavelength of selective transmission.If the ITU wavelength of this transmission is λ ₁, this wavelength X ₁The collimated devices 45 of light 410 receive.Arrived another port 42 of double-fiber collimator by refraction by prism by the light 411 of other wavelength of dense wave division multiplexer diaphragm 44 reflections.

Embodiment 2 of the present utility model (as shown in Figure 5), double-fiber collimator 57 is made up of two optical fiber capillaries 51 and lens 52.The light 510 of 57 1 port 59 outgoing of double-fiber collimator is refracted to dense wave division multiplexer diaphragm 54 by angle of wedge sheet 531 (replacing the prism 43 among the embodiment 1), the angle of wedge sheet of selecting the different angles of wedge incides angle on the dense wave division multiplexer diaphragm 54 to change deflecting light beams 56, thus the ITU wavelength of selective transmission.If the ITU wavelength of this transmission is λ ₁This wavelength X ₁The collimated devices 55 of light 511 receive.Select the light 512 of other wavelength that the angle of wedge sheet 532 of the suitable angle of wedge will reflect by diaphragm 54 to be refracted to another port 58 of double-fiber collimator simultaneously.

The utility model embodiment 3 (as shown in Figure 6), double-fiber collimator 68 is made up of two optical fiber capillaries 61 and lens 62, and the light 69 of port 611 outgoing of double-fiber collimator 68 is refracted on the dense wave division multiplexer diaphragm 66 by prism 63.On the light path of light beam 69, plug angle of wedge sheet 64 changing the angle that deflecting light beams 65 incides diaphragm 66, thus the ITU wavelength of selective transmission.If the ITU wavelength of this transmission is λ ₁, this wavelength X ₁The collimated devices 67 of light 612 receive.Arrived another port 610 of double-fiber collimator 68 by refraction by prism by the light 613 of other wavelength of dense wave division multiplexer diaphragm 66 reflections.

The prism 63 of embodiment 4 in embodiment 3 also can change by a pair of angle of wedge sheet 731 and 732 and substitute.631 and 632 is a pair of angle of wedge sheet, to replace prism 63 (as shown in Figure 7) among Fig. 6.

Embodiment 4 (as shown in Figure 8), double-fiber collimator 89 is made up of two optical fiber capillaries 81 and lens82.The light 86 of port 811 outgoing of double-fiber collimator 89 is refracted on the dense wave division multiplexer diaphragm 84 by angle of wedge sheet 83.The prism of selecting different angles incides angle on the dense wave division multiplexer diaphragm to change deflecting light beams 87.Thereby the ITU wavelength of selective transmission.If the ITU wavelength of this transmission is λ ₁, this wavelength X ₁The collimated devices 85 of light 88 receive, received by another port 810 of double-fiber collimator by the light 612 of other wavelength of dense wave division multiplexer diaphragm 66 reflections.

Embodiment 5 (as shown in Figure 9), also available another angle of wedge sheet 93 replaces former angle of wedge sheet 83 in embodiment 4.

Available 125um, 250um, 300um or other value at interval between two optical fiber in the utility model in the used double-fiber collimator.The interval of two optical fiber is big, and the straight device of two optical fiber just can be smaller apart from the distance of prism or angle of wedge sheet, and total optical path can be lacked.

Claims (6)

1. dense wave division multiplexer, comprise double-fiber collimator (47), prism (43), a DWDM diaphragm (44) and optical fiber collimator (45), double-fiber collimator (47) is made of two optical fiber capillaries (41) and lens (42), it is characterized in that optical fiber collimator (47) light exit side mouth position is provided with prism (43) and diaphragm (44)

2. dense wave division multiplexer according to claim 1 is characterized in that described prism (43) can be substituted by a pair of angle of wedge sheet (531,532).

3. dense wave division multiplexer according to claim 1 is characterized in that and can also plug the angle of wedge (64) on the preceding light path of prism (43).

4. dense wave division multiplexer according to claim 3 is characterized in that prism (43) changed by a pair of angle of wedge sheet (531,532) and forms.

5. dense wave division multiplexer according to claim 2 is characterized in that a pair of angle of wedge sheet (531,532) can be substituted by an angle of wedge sheet (83).

6. dense wave division multiplexer according to claim 5 is characterized in that described prism (43) replaces former angle of wedge sheet (83) by another angle of wedge sheet (93).

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