CN2694632Y - High insulating degree wavelength-division multiplexer / demultiplexer - Google Patents

Abstract

The utility model discloses a high insulating degree wavelength-division multiplexer / demultiplexer. The high insulating degree wavelength-division multiplexer / demultiplexer uses membrane modulus to divide lambada 1 and lambada 2 into two mutually paralleled light beams. The light beams of the wavelength lambada 2 do multiple reflections back and forth in the membrane modulus and penetrate out of the membrane modulus to make the insulating degree of the light beams of the wavelength lambada 2 raise over 50dB. The light beams of the wavelength lambada 1 penetrate, and the two light beams are changed into intersecting light beams by a prism, and then are coupled into two optical fibers by a lens to be output. The wavelength-division multiplexer / demultiplexer has compact structure, low cost and high insulating degree.

Description

The Wavelength division multiplexer/demultiplexer of high-isolation

Technical field

The utility model relates to a kind of components and parts of optical communication, particularly is applied to the Wavelength division multiplexer/demultiplexer of optical communication high-isolation.

Background technology

In the optical communication technology field, Wavelength division multiplexer/demultiplexer can be incorporated into the optical multiplexed signal of a plurality of wavelength in the optical fiber and transmit, and also the light signal of a wavelength can be decomposed in the multifiber and transmit.Wave division multiplex coupler is widely used in communication fields such as telecommunication, data communication, cable TV network, and the develop rapidly of communication field is had higher requirement to the performance and the reliability thereof of wave division multiplex coupler.

Isolation is meant that the light of device output end mouth enters non-appointed output terminal mouth light energy size, as shown in Figure 1, and isolation

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General Wavelength division multiplexer/demultiplexer need provide certain transmission isolation and reflection isolation, but along with the development of technology, existing transmission isolation and reflection isolation can not satisfy the demand of communication.In in Fiber to the home (FTTH) technology, the requirement that transmission, reflection isolation are greater than 50dB has just been proposed.

In conventional art, shown in Fig. 2 (a), pass through to use a WDM diaphragm 1 transmitted light beam λ ₁, folded light beam λ ₂Thereby, with light beam λ ₁, λ ₂Separate.For cremasteric reflex light beam λ ₂Isolation, can be at folded light beam λ ₂Bright dipping end another WDM diaphragm of connecting realize, shown in Fig. 2 (b), as light beam λ ₂After 1 reflection of WDM diaphragm, enter the WDM diaphragm 2 of another series connection, pass this WDM diaphragm 2, like this, folded light beam λ ₂Twice by the isolation of WDM diaphragm, folded light beam λ ₂Isolation to be higher than the scheme of Fig. 2 (a).But in Fig. 2 (b), owing to need realize connecting by a plurality of collimaters, this scheme realizes higher isolation if desired, just need WDM diaphragm by a plurality of band collimaters of series connection, apparatus structure is comparatively complicated like this, and the while has also increased the cost of this device and has been not suitable for large-scale production.

Summary of the invention

In order to address the above problem, compact conformation, the Wavelength division multiplexer/demultiplexer of high-isolation cheaply are provided when providing one to realize high-isolation the utility model.

To achieve these goals, the wavelength division multiplexer of the utility model high-isolation comprises two optical fiber contact pins, two lens, a film group and a prism.Wherein optical fiber contact pins comprises a Transmission Fibers, and optical fiber contact pins comprises two Transmission Fibers.When wavelength is λ ₁, λ ₂Light be input to first optical fiber; Wavelength is λ ₁, λ ₂Incide the film group; Its medium wavelength is λ ₁The light first area and the 3rd zone that directly see through diaphragm arrive prism, wavelength is λ ₁The light transmission prism after angle of beam direction deviation, again via Lens Coupling to output second optical fiber; Its medium wavelength is λ ₂Light be transmitted to the 3rd zone from the first area of film group, be reflected to the second area of film group, this reflectance coating is λ with wavelength again ₂Light reflected back the 3rd zone, pass through several secondary reflections like this after, after second area is λ with wavelength ₂Light the 4th zone that reflexes to the film group transmit again to go to and reach prism, see through that wavelength is λ behind the prism ₂Light direction by direction of deviation, at last via lens be incorporated into output the 3rd optical fiber.

Wherein the first area of film group can be coated with λ ₁, λ ₂Anti-reflection film, second area is coated with λ ₂Reflectance coating or wavelength X ₁Transmission, wavelength X ₂The WDM film of light reflection, the 3rd zone of film group is coated with transmission λ ₁, reflection λ ₂The WDM film, the 4th zone is coated with λ ₂Anti-reflection film.

Above-mentioned module can substitute by secondary diaphragm and primary diaphragm, and described secondary diaphragm and the primary diaphragm segment distance that staggers, and realize that wavelength is after the light of λ 1, λ 2 is directly injected primary diaphragm, wavelength are that the light of λ 1 is by the primary diaphragm outgoing; Wavelength is that the light of λ 2 reflexes to secondary diaphragm by primary diaphragm, between secondary diaphragm and the primary diaphragm through repeatedly the reflection after, by the secondary diaphragm outgoing.Wherein, the primary diaphragm 283 of film group can be coated with transmission λ 1, the WDM film of reflection λ 2, and secondary diaphragm can be coated with reflectance coating or wavelength X 1 transmission of λ 2, the WDM film of the light reflection of wavelength X 2.

To achieve these goals, the utility model comprises another execution mode, and it comprises two optical fiber contact pins, two lens, and a diaphragm and a prism, wherein first optical fiber contact pins comprises first optical fiber, second optical fiber contact pins comprises second optical fiber, the 3rd optical fiber.Its medium wavelength be the light of λ 1, λ 2 be input to first optical fiber by first collimated after, incide first end face of prism; Its medium wavelength is first end face that the light of λ 1 directly sees through prism, and wavelength is that λ 1 light beam sees through angle of beam direction deviation behind the prism, again via second Lens Coupling to output the 3rd optical fiber; Its medium wavelength is that the light of λ 2 passes through first end face reflection of prism behind diaphragm, light beam λ 2 reflexes to first end face of prism again via diaphragm, like this, and after repeatedly reflecting, at last by diaphragm with beam reflection to second lens, be coupled to then output second optical fiber.

Wherein can be coated with reflection wavelength be the film of λ 2 light or to be coated with reflection wavelength be λ 2 light to diaphragm, and transmission peak wavelength is the WDM film of λ 2 light, and first end face of prism is coated with the light that transmission peak wavelength is λ 1, and reflection wavelength is the WDM film of the light of λ 2.

Because the utility model utilizes the WDM diaphragm that λ 1, λ 2 are divided into the light beam that two-way is parallel to each other, wherein the light beam of reflection wavelength in diaphragm inside several back and forth secondary reflections again transmission go out, make the isolation of reflection wavelength improve several times, with a prism two route parallel beams is become crossing light beam then, at last by exporting in same Lens Coupling to two optical fiber.This structure is compared with two prior arts, has following advantage:

Reflection wavelength is at several secondary reflections of process, and the reflection wavelength isolation improves several times;

Utilize prism to change beam direction, the two-way light beam can be by same Lens Coupling, compact conformation;

Description of drawings

Below in conjunction with drawings and Examples light channel structure of the present utility model is further specified.

Fig. 1 is the isolation schematic diagram of Wavelength division multiplexer/demultiplexer;

Fig. 2 (a) is the schematic diagram of traditional Wavelength division multiplexer/demultiplexer;

Fig. 2 (b) is the schematic diagram of another kind of traditional Wavelength division multiplexer/demultiplexer;

Fig. 3 is the index path of first specific embodiment of the Wavelength division multiplexer/demultiplexer of the utility model high-isolation;

Fig. 4 is the index path of another execution mode of module 18 of first specific embodiment of the Wavelength division multiplexer/demultiplexer of the utility model high-isolation;

Fig. 5 is the index path of second specific embodiment of the Wavelength division multiplexer/demultiplexer of the utility model high-isolation.

Embodiment

Further specify below in conjunction with the index path and the structure of accompanying drawing the Wavelength division multiplexer/demultiplexer of the utility model high-isolation.

Fig. 3 is the light path principle figure of first embodiment of the present utility model, and as shown in Figure 3, the wavelength division multiplexer of the utility model high-isolation comprises 14,15, two lens 16,17, one film groups 18 of two optical fiber contact pins and a prism 19.Wherein optical fiber contact pins 14 comprises Transmission Fibers 141, and optical fiber contact pins 15 comprises Transmission Fibers 151,152.When wavelength is that the light of λ 1, λ 2 is input to optical fiber 141; Wavelength is after the light of λ 1, λ 2 collimates by optical fiber 141 incidents after by lens 16, to incide film group 18; Its medium wavelength is first area 181 and the 3rd zone 183 arrival prisms 19 that the light of λ 1 directly sees through diaphragm 18, and wavelength is angle of light transmission prism 19 back beam direction deviations of λ 1, is coupled to output optical fibre 152 via lens 17 again; Its medium wavelength is that the light of λ 2 is transmitted to the 3rd zone 183 from the first area 181 of film group 18, be reflected to the second area 182 of film group 18, this reflectance coating is light reflected back the 3rd zone 183 of λ 2 again with wavelength, like this through behind several secondary reflections, after second area 182 is that the 4th zone 184 that the light of λ 2 reflexes to film group 18 transmits to go to again and reaches prism 19 with wavelength, the light direction that sees through prism 19 back wavelength and be λ 2 is coupled to output optical fibre 151 via lens 17 at last by direction of deviation.

Wherein the logical light face of first of film group 18 comprises two different plated film first areas 181 and second area 182, wherein first area 181 is coated with the anti-reflection film of λ 1, λ 2, second area 182 is coated with reflectance coating or wavelength X 1 transmission of λ 2, the WDM film of the light reflection of wavelength X 2, second logical light bread of film group 18 contains the 183 and the 4th zone 184, two different plated films the 3rd zone, wherein the 3rd zone 183 is coated with transmission λ 1, the WDM film of reflection λ 2, and the 4th zone 184 is coated with the anti-reflection film of λ 2.

As above module 18 can be realized by another simple form among the embodiment, as shown in Figure 4, module 28 comprises secondary diaphragm 282 and primary diaphragm 283, described secondary diaphragm 282 and primary diaphragm 283 segment distance that staggers, and realize that wavelength is after the light of λ 1, λ 2 is directly injected primary diaphragm 283, wavelength is that the light of λ 1 is by primary diaphragm 283 outgoing; Wavelength is that the light of λ 2 reflexes to secondary diaphragm 282 by primary diaphragm 283, between secondary diaphragm 282 and the primary diaphragm 283 through repeatedly the reflection after, by secondary diaphragm 282 outgoing.

Wherein, the primary diaphragm 283 of film group 28 can be coated with transmission λ 1, the WDM film of reflection λ 2, and secondary diaphragm 282 can be coated with reflectance coating or wavelength X 1 transmission of λ 2, the WDM film of the light reflection of wavelength X 2.

Said structure is divided into two-way with film group 18 (28) with the signal λ 1 of different wave length, the light beam of λ 2, its medium wavelength be the light of λ 2 after 18 (28) internal reflections repeatedly of WDM diaphragm again transmission go out, improved isolation with respect to λ 2, by prism 19 the two-way light beam is angled to the intersection light beam of the specific angle of cut then, its intersecting angle size equates with two beam angle of optical fiber 151,152 outgoing behind lens 17 collimations, is coupled to different output optical fibre 151,152 by lens 17 jointly at last.

Fig. 5 is the light path principle figure of the utility model second embodiment, as shown in Figure 5, the utility model Wavelength division multiplexer/demultiplexer comprises two optical fiber contact pins 14,15, two lens 16,17, a diaphragm 38 and a prism 29, wherein optical fiber contact pins 14 comprises Transmission Fibers 141, and optical fiber contact pins 15 comprises Transmission Fibers 151,152.Its medium wavelength is λ ₁, λ ₂Light be input to optical fiber 141; Wavelength is λ ₁, λ ₂Light by optical fiber 141 outgoing after become collimated light beam by lens 16, incide first end face 291 of prism 29; Its medium wavelength is λ ₁Light directly see through first end face 291 of prism 29, wavelength is λ ₁Light beam sees through angle of prism 29 back beam direction deviations, is coupled to output optical fibre 152 via lens 17 again; Its medium wavelength is λ ₂First end face 291 of light by prism 29 reflex to diaphragm 38, light beam λ ₂Reflex to the zone 291 of prism 29 again via diaphragm 38, like this, through repeatedly the reflection after, at last by diaphragm 38 with beam reflection to lens 17, be coupled to output optical fibre 151 then.

Wherein can be coated with reflection wavelength be λ to diaphragm 38 ₂The film of light or to be coated with reflection wavelength be λ ₂Light, transmission peak wavelength are λ ₂The WDM film of light, it is λ that first end face 291 of prism 29 is coated with transmission peak wavelength ₁Light, reflection wavelength is λ ₂The WDM film of light.

In the said structure, reflection wavelength is λ ₂Light beam after diaphragm 38 and 29 reflections repeatedly of prism, arrive lens 17 again, having improved wavelength is λ ₂The isolation of light.

Because the present invention is with reflected wavelength lambda ₂Light beam at film group 18 or film group 28 and diaphragm 38 and prism 19 inner several secondary reflections, make its wavelength X ₂The folded light beam isolation reach more than the 50dB, the present invention also utilizes the light beam of prism deviation two-way wavelength that it is intersected, and can be coupled with same lens, like this compact conformation.Prior art needs two WDM diaphragms could realize high-isolation, and needs two devices to be cascaded.This structure has following advantage:

1. wavelength is λ ₂Catoptrical isolation height;

2. compact conformation;

3. cost is low.

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 (9)

1. the Wavelength division multiplexer/demultiplexer of a high-isolation is characterized in that: comprise two optical fiber contact pins, two lens, one film group and a prism, wherein, first optical fiber contact pins comprises one first optical fiber, second optical fiber contact pins comprises second and third optical fiber, when wavelength is λ ₁, λ ₂Light by first optical fiber input to the film group; Wherein, wavelength is λ ₁Light directly see through the first area of diaphragm and the 3rd zone after by angle of prism deviation by Lens Coupling to second optical fiber; Wavelength is λ ₂Light be transmitted to the 3rd zone from the first area of film group, be reflected to the second area of film group, this reflectance coating is λ with wavelength again ₂Light reflected back the 3rd zone, behind at least twice secondary reflection, go out the back by direction of prism deviation, after by Lens Coupling to the three optical fiber by the 4th regional transmission of film group.

2. the Wavelength division multiplexer/demultiplexer of high-isolation according to claim 1 is characterized in that, the first area of film group can be coated with λ ₁, λ ₂Anti-reflection film; Second area is coated with λ ₂Reflectance coating or wavelength X ₁Transmission, wavelength X ₂The WDM film of light reflection; The 3rd zone of film group is coated with transmission λ ₁, reflection λ ₂The WDM film; The 4th zone can be coated with λ ₂Anti-reflection film.

3. the Wavelength division multiplexer/demultiplexer of high-isolation according to claim 1 is characterized in that, module can replace with primary diaphragm and secondary diaphragm, and primary diaphragm and the secondary diaphragm certain distance that staggers, and making wavelength is λ ₁, λ ₂Light directly inject primary diaphragm after, wavelength is λ ₁Light by the primary diaphragm outgoing; Wavelength is λ ₂Light reflex to primary diaphragm by secondary diaphragm, between primary diaphragm and the secondary diaphragm through repeatedly the reflection after, by the secondary diaphragm outgoing.

4. the Wavelength division multiplexer/demultiplexer of high-isolation according to claim 3 is characterized in that, primary diaphragm can be coated with transmission λ ₁, reflection λ ₂The WDM film, secondary diaphragm can be coated with λ ₂Reflectance coating or wavelength X ₁Transmission, wavelength X ₂The WDM film of light reflection.

5. the Wavelength division multiplexer/demultiplexer of high-isolation according to claim 1 is characterized in that, the two-beam polarization is intersected by prism by the light beam after the film group.

6. the Wavelength division multiplexer/demultiplexer of a high-isolation is characterized in that, comprises two optical fiber contact pins, two lens, and a diaphragm and a prism, wherein first optical fiber contact pins comprises first optical fiber, and second optical fiber contact pins comprises second optical fiber, and the 3rd optical fiber is when wavelength is λ ₁, λ ₂Light by first optical fiber by first collimated after, incide first end face of prism; Wherein, wavelength is λ ₁Light directly see through angle of beam direction deviation behind first end face of prism, again via second Lens Coupling to output second optical fiber; Wavelength is λ ₂First end face reflection of light by prism behind diaphragm, light beam λ ₂Reflex to first end face of prism again via diaphragm, after repeatedly reflecting, by diaphragm beam reflection is coupled to the output of the 3rd optical fiber to second lens two at last.

7. the Wavelength division multiplexer/demultiplexer of high-isolation according to claim 6 is characterized in that, diaphragm can be coated with λ ₂Reflectance coating or wavelength X ₁Transmission, wavelength X ₂The WDM film of light reflection.

8. the Wavelength division multiplexer/demultiplexer of high-isolation according to claim 6 is characterized in that, first end face of prism can be coated with transmission λ ₁, reflection λ ₂The WDM film.

9. the Wavelength division multiplexer/demultiplexer of high-isolation according to claim 8 is characterized in that, prism is λ with wavelength ₁Angle of light beam polarization makes λ ₁And λ ₂Light beam intersects.

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