CN2485874Y

CN2485874Y - Compact multichannel intensive wavelength division multiplexer

Info

Publication number: CN2485874Y
Application number: CN01244422U
Authority: CN
Inventors: 吴砺; 郭占华; 凌吉武; 曾和平
Original assignee: FUJIAN HUAKE PHOTOELECTRIC CO LTD
Current assignee: FUJIAN HUAKE PHOTOELECTRIC CO LTD
Priority date: 2001-06-18
Filing date: 2001-06-18
Publication date: 2002-04-10
Anticipated expiration: 2011-06-18

Abstract

The utility model discloses a compact multichannel intensive wavelength division multiplexer, comprising an optical fiber collimator, a DWDM light filter, a clamping apparatus of film, a base and a column-shaped hole. The column-shaped hole is arranged inside the base in Z shape or I shape; and the column-shaped clamping apparatus of film and the DWDM light filter are positioned inside the column-shaped hole; the optical fiber collimator is fixed at the external side of the base; and a prism is placed in the light path to change direction of light. Due to the structure, the distance between two adjacent channels is shortened as well as the light path, the volume of the apparatus is decreased and the growth factor of the insertion loss of the collimator is also reduced.

Description

A kind of compact multichannel dense wave division multiplexer

The utility model relates to a kind of wavelength division multiplexer, especially a kind of multichannel dense wave division multiplexer.

In optical fiber telecommunications system, wavelength-division multiplex technique has become its vital part.In the optical communication transmission system, use wavelength-division multiplex technique, can make the composite optical signal that comprises different wave length be able in simple optical fiber transmission simultaneously, thereby can make full use of the bandwidth of an optical fiber characteristic and existing bandwidth resources obtain large-scale transmission capacity.Because dense wave division multiplexer (DWDM) can big limit utilize the bandwidth of an optical fiber resource, obtain more multiplexing way, become people gradually and pay close attention to and study the heat injection point.In the prior art, the dense wave division multiplexer light path as shown in Figure 1, wherein 101,102,103 is optical fiber, 21 is double optical fiber head, 22 is the single fiber head, 31,32 is GRIN Lens, 41 is the DWDM filter.Flashlight by optical fiber 101 incidents comprises the individual signal wavelength of n (n 〉=2), through becoming collimated light beam after GRIN Lens 31 focusing, when being incident to DWDM filter 41, wherein a kind of wavelength light transmission, and all the other wavelength light reflections, transmitted light beam is incident to branch through GRIN Lens 32 and penetrates optical fiber 103, and folded light beam then enters branch and penetrates optical fiber 102 after GRIN Lens 31.For reaching multiplexed purpose, said structure can be carried out cascade and obtain, but the follow-up passage Insertion Loss of such structure growth factor is bigger, and the volume of entire device is also bigger.

For reducing the Insertion Loss growth factor of follow-up passage, can yet be regarded as a kind of scheme of worth reference of light path principle shown in Figure 2,11,12,13,14,15 and 16 is the DWDM narrow-band pass filter among the figure.The incident composite light beam can directly repeatedly reflect between filter, and the corresponding wavelength that respective filter transmits, thereby reach multiplexed purpose.But there is such problem in this scheme for the DWDM filter, because the DWDM filter is comparatively strict for the centre of homology wavelength requirement of DWDM narrow-band pass filter, so signal beams must low-angle incident on filter.Because according to formula:

λ=λ ₀(1-csin ²θ) ^1/2λ in the formula ₀Centre wavelength during for zero degree incident, λ is the centre wavelength of incidence angle when being θ, c is a constant relevant with the DWDM narrow-band pass filter; When θ increased, Δ θ caused that the variation of Δ λ will obviously increase.The incidence angle θ that adopts is generally about 1.8 ° at present, with regard to this scheme, with needing the maintenance certain distance so that regulate between the end adjacent channel, it is very long that light path will certainly be drawn, so not only device length is oversize, and collimater also can be excessive because of the long Insertion Loss of operating distance.

The purpose of this utility model is to provide a kind of can not only reduce follow-up passage Insertion Loss growth factor, and volume is less, the convenient compact dense wave division multiplexer of regulating.

The utility model adopts following structure to reach above-mentioned purpose, and a kind of compact multichannel dense wave division multiplexer comprises optical fiber collimator, DWDM filter, diaphragm clamper, pedestal etc.Be provided with cylindrical cavity vertical more than in the pedestal with the bottom surface, cylindrical cavity is " Z " word and is distributed in the base interior left and right sides, and its inside is placed with the said cylindrical membranes clamper, the diaphragm clamper is built-in with a DWDM filter, optical fiber collimator is fixed on the pedestal outside by sleeve pipe, and corresponding with the position of inner diaphragm clamper, place the rhombic prism that can make light beam translation in the DWDM filter light path facing each other, rhombic prism is fixed on the pedestal inner bottom surface.

In addition, can also adopt cylindrical cavity to be " I " word arrangement in base interior one end, pedestal other end light path is provided with Dove prism, and Dove prism is fixed on the pedestal inner bottom surface.

Above-mentioned Dove prism also can be the isosceles prism.

Adopt a kind of compact multichannel dense wave division multiplexer behind the said structure can shorten distance between two adjacent channels, shortened light path, reduced device volume, reduced the Insertion Loss growth factor of collimater.

Below in conjunction with accompanying drawing the utility model is done further detailed description:

Fig. 1 is a prior art DWDM index path.

Fig. 2 is existing multichannel dense wave division multiplexer light path principle figure.

Fig. 3 is the utility model index path.

Fig. 4 is the logical light light path schematic diagram of the utility model rhombic prism.

Fig. 5 is the utility model structural representation.

Fig. 6 is that the utility model diaphragm clamper axle cuts open schematic diagram.

Fig. 7 is the another kind of index path of the utility model.

Fig. 8 is the logical light light path schematic diagram of the utility model Dove prism.

Fig. 9 is the third index path of the utility model.

Shown in Fig. 3,4,11,12,13,14,15,16,17,18 is collimater among the figure, respectively incident, emergent light are done up collimation and converging action, 21,22,23,24,25 and 26 is the DWDM narrow-band pass filter with the wave property selected, reflect its commplementary wave length being scheduled to the specific ITU of transmissive (International Telecommunications Union) standard wave length under the incident angle, 31,32 and 33 is rhombic prism.Rhombic prism side S ₁, S ₂The plating anti-reflection film, S ₃, S ₄Polishing both surfaces, promptly as shown in Figure 4.Incident composite signal light beam is a collimated light beam through collimater 11 at first, incides filter 21 then, and incidence angle is about 1.8 °, and through the transmittance of one road ITU wavelength after this filter, all the other are reflected; Transmitted light is focused on by collimater 12 and enters outgoing optical fiber, and reverberation is through S ₁Face is injected rhombic prism 31, through S ₃Total reflection takes place during face, to S ₄After, total reflection takes place once more, after S ₂Face penetrates, and is incident upon filter 22 and isolates one road ITU wavelength light again; And the like, separated until all ITU wavelength, realized the single-ended input of light, both-end output.

The utility model structure as shown in Figure 5, respectively there is row's cylinder-shaped sleeve outside, pedestal two ends, each sleeve pipe is evenly distributed with four welding holes, and each side there be the row cylindrical cavity vertical with the bottom surface in portion within it, is used for placing columniform diaphragm clamper (as shown in Figure 6).Casing inner diameter is a bit larger tham the collimater external diameter, and collimater portion is within it slightly regulated, and regulates the back and fixes by the welding hole welding; The diaphragm clamper that is fixed with the DWDM filter can rotate adjusting in the hole of base interior, by rotation adjustment beam incidence angle and folded light beam direction; Rhombic prism with 353 glues at the base bottom inner surface.

Be the another kind of index path of implementing of the present utility model as shown in Figure 7, one group of Dove prism of

utilization

31,32,33 turns back light beam and draws back in this scheme.Dove prism bottom surface S ₁The plating anti-reflection film, S ₂, S ₃Polishing both surfaces, light beam is at S ₂, S ₃Face generation total reflection, as shown in Figure 8.Can realize single-ended input by this scheme, single-ended output.

Fig. 9 is an another implementation method index path of the present utility model, with one group of

isosceles prism

30,31,32,33 incident beam is directly turned back in this scheme, has realized with end input, output.

More than we are that example illustrates the utility model with the demodulation multiplexer, with light path in the above implementation method reverse be exactly multiplexer of the present utility model.

Claims

1, a kind of compact multichannel dense wave division multiplexer, comprise optical fiber collimator, the DWDM filter, the diaphragm clamper, pedestal etc., it is characterized in that described pedestal inner bottom surface is provided with cylindrical cavity vertical with the bottom surface more than, cylindrical cavity is " Z " word and is distributed in the base interior left and right sides, and cylindrical cavity inside all is placed with the said cylindrical membranes clamper, each diaphragm clamper is built-in with a DWDM filter, optical fiber collimator is fixed on the pedestal outside by sleeve pipe, and the optical fiber collimator center is corresponding with DMDW filter center in the inner diaphragm clamper, place the rhombic prism that can make light beam translation in the DWDM filter light path facing each other, rhombic prism is fixed on the pedestal inner bottom surface.

2, a kind of compact multichannel dense wave division multiplexer according to claim 1, it is characterized in that described pedestal inner bottom surface is provided with cylindrical cavity vertical with the bottom surface more than, cylindrical cavity is " I " word arrangement in pedestal inner bottom surface one side, and cylindrical cavity inside all is placed with the said cylindrical membranes clamper, each diaphragm clamper is built-in with a DWDM filter, optical fiber collimator is fixed on the pedestal outside by sleeve pipe, and the optical fiber collimator center is corresponding with DWDM filter center in the inner diaphragm clamper, the logical light path of pedestal opposite side is provided with Dove prism, and Dove prism is fixed on the pedestal inner bottom surface.

3, a kind of compact multichannel dense wave division multiplexer according to claim 2 is characterized in that described prism can also be the isosceles prism.