CN2706966Y

CN2706966Y - High transmission isolating degree WDM apparatus

Info

Publication number: CN2706966Y
Application number: CNU2004200427032U
Authority: CN
Inventors: 王则钦; 陈彬; 李屹
Original assignee: O Net Communications Shenzhen Ltd
Current assignee: O Net Technologies Shenzhen Group Co Ltd
Priority date: 2004-02-20
Filing date: 2004-02-20
Publication date: 2005-06-29
Anticipated expiration: 2014-02-20

Abstract

Disclosed is a high transmission beam isolating degree WDM apparatus, comprising diaphragms of double optical-fiber collimator, diaphragms of single optical-fiber collimator, and a casing. Wherein, the WDM plates are arranged into a plurality of WDM plates connected in series in order to solve the problem by coating technology to raise the isolating degree of the transmission beams, and to reach the effect of raising the isolating degree of transmission beams.

Description

The wavelength division multiplexer of high transmission isolation

Technical field

The utility model relates to a kind of components and parts of optical communication, particularly in the wavelength division multiplexer of high transmission isolation.

Background technology

In the optical communication technology field, traditional wavelength-division multiplex system uses film optical filtering type wavelength division multiplexer.As shown in Figure 1, the common wavelength division multiplexer of use film WDM sheet is provided with the three channel device 100a to 100d of series connection.It shown in Fig. 2 a structure in these devices 100.Three channel device 100 comprises input optical fibre 101, Transmission Fibers 102, mirror based fiber optica 103,

collimater

104 and 106 and WDM sheet 105.Filter by the light transmission collimater 104 of input optical fibre 101 introducings and by WDM sheet 105.WDM sheet 105 only allows the light of specific wavelength (λ) to pass through.The light transmission collimater 106 of this specific wavelength (λ) reaches Transmission Fibers 102, and other light except specific wavelength (λ) are sent to mirror based fiber optica 103 by 105 reflections of WDM sheet by collimating lens 10.

And tradition also has a kind of wavelength division multiplexer to adopt the fuse-type fiber coupler, merges by optical fiber to form.

Although film optical filtering type wavelength division multiplexer and fuse-type fiber coupler be the photoconduction that is used for making specific wavelength to special modality, in fact we know that still some light bleeds and wishes the passage that passage is adjacent.This leakiness is called as isolation.For example, the adjacent passage that bleeds of the light as 1/100, we just are expressed as the leakage of this degree the isolation of 20dB.

When use has the three channel device of WDM sheet wavelength division multiplexer, traditional wavelength division multiplexer can reach satisfied isolation on folded light beam, yet, the raising of said apparatus isolation on the transmitted light path does not have solution, if improving the isolation of transmitted light beam by the coating technique that improves the WDM sheet is the comparison difficulty, and costs an arm and a leg.

Summary of the invention

Consider the problems referred to above, a purpose of the present utility model provides the wavelength division multiplexer of realizing enough transmission channels isolations under the low situation of a kind of cost.

To achieve these goals, wavelength division multiplexer according to the utility model first aspect, the WDM sheet is arranged to a plurality of WDM sheets and is in series, exactly, the WDM sheet of a plurality of WDM sheet series connection has not only increased isolation of the present utility model, also reduced simultaneously manufacturing cost, for example say, isolation between the near wavelength of two adjacent wave appearance is arranged on 60dB or bigger, can be designed to plural WDM sheet series connection according to the needs of the wavelength division multiplexer of the utility model first aspect like this and reach realize isolation 60dB or more than.

To achieve these goals, according to the wavelength division multiplexer of the utility model second aspect, promptly the exiting surface end at the single fiber head is coated with the WDM film, and this spline structure is guaranteed light beam λ 2 at least by WDM sheet and WDM film, thereby improves transmitted light beam λ 2 isolations.

Description of drawings

Below in conjunction with drawings and Examples the utility model is further specified.

Fig. 1 is a prior art thin-film optical mutiplexer system diagram.

Fig. 2 is the schematic diagram of conventional films multiplexer.

Fig. 3 is the profile of first specific embodiment of the utility model wavelength division multiplexer.

Fig. 4 is the optical schematic diagram of WDM sheet stack.

Fig. 5 is to the utility model isolation and wavelength relationship figure.

Fig. 6 is the profile of the utility model second embodiment.

Fig. 7 is an assembly drawing of the present utility model.

Fig. 7 (a) is the assembly drawing of first collimator apparatus of the present utility model.

Fig. 7 (b) is the assembly drawing of second collimater of the present utility model.

Embodiment

As shown in Figure 3, the utility model wavelength division multiplexer 10 comprises one first collimator apparatus 11, second collimator apparatus 12 and WDM sheet 13,14, wherein, first collimator apparatus 11 comprises a double optical fiber head 111, one lens 112, the one fixedly glass bushing or the metal sleeve 113 of double optical fiber head 111 and lens 112, described second collimator apparatus 12 comprises a single fiber head 121, one lens 122 and one are the glass bushing 123 of single fiber head 121 and lens 122 fixedly, the incident optical 15 emitted light beams λ 1 of wherein said double optical fiber head 111, λ 2, focus on through first collimator apparatus 11, light beam λ 1, λ 2 injects

WDM sheet

13,13 couples of λ of this WDM sheet 2 carry out transmission and λ 1 are reflected, λ 2 enters in the single fiber head 121, the utility model and different being of conventional WDM chip architecture, the utility model wavelength division multiplexer 10 also comprises a WDM sheet 14, it filters successively to λ 2 light beams again, transmitted light beam λ 2 is through twice optical filtering like this, can not reach the problem of high-isolation thereby solve the single plated film, thereby increase the isolation of this transmitted light beam, and reach the current engineering demand.

Fig. 4 is the optical schematic diagram of WDM sheet stack.As shown in Figure 4, λ 1, and λ 2 ... λ n is transferred to WDM sheet 1, and λ 2 is filtered, and λ 2 enters WDM sheet 2 once more, and resulting like this light beam λ 2 ' has high-isolation.

Fundamental diagram according to Fig. 4, isolation of the present utility model is tested, as shown in Figure 5, after curve 1 is isolated system WDM sheet 13 among the figure, the isolation of this wavelength division multiplexer of testing and the relation between the wavelength, after curve 2 is isolated system WDM sheet 14, the isolation of this measured wavelength division multiplexer and the relation between the wavelength, curve 3 is the theoretical superposition value according to the wave plate principle of stacking of Fig. 5, curve 4 is the isolation that comprises the wavelength division multiplexer behind the WDM sheet 13,14 and the relation between the wavelength, wherein, curve 3 and curve 4 overlap substantially, illustrate that the actual superposition value basic symbols of the utility model isolation is rationally discussed superposition value.Can get from test curve, two WDM sheets have increased the isolation of transmitted light beam λ 2.

Another embodiment of the utility model, as shown in Figure 6, promptly the reception light face end 1211 at single fiber head 121 is coated with the WDM film, or plates the WDM film on the end face 1221 of lens 122, this spline structure is guaranteed light beam λ 2 at least by WDM sheet 13 and WDM film, thereby improves transmitted light beam λ 2 isolations.

Fig. 7 is the concrete structure figure that adopts technique scheme, and Fig. 7 (a) is the assembly drawing of second collimator apparatus 11 of the utility model wavelength division multiplexer, and its manufacturing process is: earlier filter element 13 usefulness glue 30 are affixed on the lens 112, regulate the pitch of lens 112; Then, double optical fiber head 111 is aimed at the lens 112 that post filter element 13, and double optical fiber head 111 adjusted on the XYZ axle, its light path is shown in Fig. 7 (a), its light path is: incident light reflects back via the filtered element 13 in lens 112 backs from optical fiber 15 incidents, via lens 112, received again by optical fiber 16.When optical fiber 15 receives minimum loss, double optical fiber head 111 and the lens 112 that post filter element 13 are fixed with glue 30.Put glass tube 113 at last, blended rubber 30 is fixing.

As Fig. 7 (b) is the assembly drawing of second collimator apparatus 12 of the utility model wavelength division multiplexer, its manufacturing process is: earlier filter element 14 usefulness glue 30 are affixed on the lens 122, then, single fiber head 121 is aimed at the lens 122 that post filter element 14, then, single fiber head 121 is advanced glass tube, by regulating single fiber head 121 and lens 122 pitch certainly that posts filter element 14, make it obtain minimum loss, with glue 30 that single fiber head 121 is fixing again; Put glass bushing 123 at last, blended rubber 30 is fixed.

As shown in Figure 7, when its outgoing optical fiber 17 obtains minimum loss, with glue 30 first collimater 11 and second collimater 12 are fixed on 40 li of big glass tubes, this just obtains wave division multiplex coupler shown in Figure 7.

Have the WDM sheet that is difficult to reach high-isolation because the utility model will have now, resolve into repeatedly plated film, or a plurality of WDM sheet is realized high transmitted light beam isolation by the single plated film.Only improving the difficulty of the isolation of transmitted light beam thereby remedy traditional wavelength division multiplexer, and reaching the high-isolation of transmitted light beam by the coating technique that improves the WDM sheet.

The above person is the utility model most preferred embodiment only, is not to be used to limit scope of the present utility model, and all equivalences of being done according to the utility model claim change or modify, and are all the utility model and contain.

Claims

1. the wavelength division multiplexer of a high transmitted light beam isolation comprises by double-fiber collimator and single fiber collimater diaphragm and housing etc. and forming, and it is characterized in that: comprise plural at least WDM sheet.

2. as the wavelength division multiplexer of claims 1 described a kind of high transmitted light beam isolation, it is characterized in that the WDM sheet can place between single fiber collimater and the double-fiber collimator.

3. as the wavelength division multiplexer of claims 1 described a kind of high transmitted light beam isolation, it is characterized in that the end face that receives light in the single fiber collimater directly plates the WDM film.

4. as the wavelength division multiplexer of claims 1 described a kind of high transmitted light beam isolation, it is characterized in that the end face that receives light at the single fiber head directly plates the WDM film.