CN2450830Y

CN2450830Y - High isolation wavelength-division multiplexer

Info

Publication number: CN2450830Y
Application number: CN 00240876
Authority: CN
Inventors: 吴砺; 黄雪钦; 凌吉武; 黄石庚; 邬俊峰
Original assignee: Casix Inc
Current assignee: Casix Inc
Priority date: 2000-11-03
Filing date: 2000-11-03
Publication date: 2001-09-26
Anticipated expiration: 2010-11-03

Abstract

The utility model relates to a high-isolation-degree wavelength-division multiplexer. On the light output end face of double optical fiber heads in the existing wavelength-division multiplexer structure, an anti-reflection film is plated on one side of the optical fiber head containing output light; a WDM film is plated on the other optical fiber end face of the double optical fiber head containing receiving light. The structure enhances the isolation of the wavelength-division multiplexer to two beams of light of different wavelength, and simultaneously decreases the volume of the device and satisfies the ever developmental requirements of the optical fiber communication field.

Description

A kind of high-isolation wavelength division multiplexer

The utility model relates to the WDM wavelength division multiplexer that uses in a kind of optical-fibre communications field, and particularly a kind of have a high-isolation WDM wavelength division multiplexer.

Along with optical-fibre communications develops rapidly, require more and more higher to the fiber optic passive device performance index.As some system the high requirement of isolating is proposed all for wavelength division multiplexer (hereinafter to be referred as WDM) requirement on devices reflection end and transmission end, simultaneously to equally require the external form of tight shape small size with all passive devices.

In general, WDM diaphragm individual reflection isolation only is about 17dB, and single transmission isolation is more than 40dB.As shown in Figure 1.Among Fig. 1 101 is the WDM diaphragm, reverberation λ ₂In generally contain-17dB λ ₁Light, λ ₁In contain λ ₂Generally can be less than-40dB, that is to say reverberation to the transmitted light isolation about 17dB, transmitted light reaches more than the 40dB the reverberation isolation.And require reverberation, transmitted light isolation all more than 35dB in a lot of devices.

Clearly, need introduce a WDM diaphragm again to reverberation λ 2 and could produce more high-isolation, as 202 being the WDM diaphragm among Fig. 2, it is to λ ₁Reflection is to λ ₂The high reflection end of isolating of this spline structure realization is not difficult to find out in transmission.

301 is WDM diaphragm λ among Fig. 3 ₁Transmission, λ ₂Reflection; 302 is the WDM diaphragm, 302 couples of λ ₁Transmission is to λ ₂The reflection, then among the λ 2 to λ ₁Isolation also can be near 35dB.Introducing the problem that two or two above WDM diaphragm conventional design bring is that outline body is bigger.As shown in Figure 3.401,403,405 are collimater, and 402,404 is the WDM diaphragm, and conventional collimater outward appearance is φ 3.2mm, for 401,405 liang of collimaters being installed, the inevitable requirement that requires shell φ 5.5mm greater than conventional passive device of its structure.

The purpose of this utility model is: design the wavelength division multiplexer that a kind of volume is little, isolation is high, to satisfy the user demand of optical-fibre communications field.

The following structure of this novel employing realizes above-mentioned purpose, and this structure is made up of double-fiber collimator, WDM diaphragm and single fiber collimater and housing.In double-fiber collimator, be coated with anti-reflection mirror respectively at containing the incident light fiber section on the double optical fiber head exiting surface, contain reverberation fiber section plating WDM film, a part is with anti-reflection film simultaneously on same otpical leaf, another part band WDM film, or be fixed on the double optical fiber head exiting surface, should guarantee the anti-reflection film part on one side at incident light optical fiber, band WDM film is at double-fiber collimator receiving terminal optical fiber on one side.

Adopt the as above high-isolation wavelength division multiplexer of structure fabrication, the two-beam of energy effective isolation different wave length, it is little to have guaranteed that simultaneously device takes up room, no matter adopt directly at double optical fiber head exiting surface coating structure, the otpical leaf that still will have anti-reflection film and WDM film is fixed in the double optical fiber head end face, all can effectively guarantee the real efficient isolation of light of different wave length, satisfy the constantly demand of development of optical-fibre communications field.

Illustrate below in conjunction with example:

Fig. 1 is a prior art WDM single-iris light path.

Fig. 2 is the two diaphragm light paths of prior art WDM.

Fig. 3 is the prior art optical structure chart.

Fig. 4 is the utility model optical structure chart.

Fig. 5 is the another kind of optical structure chart of the utility model.

Fig. 6 is the A-A cutaway view of Fig. 5.

Fig. 7 is a profile of the present utility model.

Optical fiber 501,502 is optical fiber cable among Fig. 4, and 503 is two optical fiber capillaries, and 507 be GRIN Lens, and 504 is the glass tube or the metal tube of fixedly double optical fiber head and GRIN Lens.Double optical fiber head 503 constitutes double-fiber collimator with

GRIN Lens

507, and 508 is the WDM diaphragm, and 509 is the single fiber collimater, accepts to send the transmitted light of light by WDM diaphragm 508 from double-fiber collimator 501.With conventional WDM device architecture not simultaneously, introduce two optical sheets 505,506 at double optical fiber head optical fiber exiting surface.Wherein 505 is the WDM diaphragm, to from WDM diaphragm 508 reverberation λ ₂Carry out transmission, and to λ ₁Reflect.506 is its thickness of optical glass sheet and the WDM diaphragm 505 identical thickness with anti-reflection mirror, and identical with WDM diaphragm matrix optical glass sheet material, but to λ ₁And λ ₂Wavelength is two anti-reflection, and this spline structure guarantees that two optical fiber go out the relative lens of luminous point on same focal plane.Optical glass sheet can adopt common optical element fixation to be fixed on the optical fiber head end face with glue, but should guarantee that light path is unimpeded.

Another embodiment of the utility model, as shown in Figure 5, promptly at double optical fiber head exiting surface B end plating anti-reflection film, at the C of double optical fiber head exiting surface end plating WDM film.As shown in Figure 6, Fig. 6 can be completely achieved function shown in Figure 5.

Fig. 7 is the concrete structure figure that adopts technique scheme, and 901,902,918 are optical fiber cable, and 903,917 is rubber sheath, 904 is stainless steel outer sleeve, and 905,913 is the collimater metal-coating, and 906 is glass tube, 907 is two optical fiber capillaries, 908 is scolding tin, and 909,912 is epoxy glue, and 910,914 is GRIN Lens, 911 is the WDM diaphragm, 912 is the WDM film at the plating of optical fiber end 902 end faces, and 919 is that 915 is the single fiber capillary at the anti-reflection film of optical fiber 901 end faces plating.Be not difficult to find out that this patent has successfully been realized transmitted light and the high isolation of reverberation, and the same small and exquisite volume of its volume and conventional WDM device.Two-beam λ when different wave length ₁And λ ₂After entering in the wavelength division multiplexer by optical fiber 901, λ ₁From 918 optical fiber, come out λ ₂Then from optical fiber 902, penetrate the λ of ejaculation ₁And λ ₂Two-beam has been realized high-isolation.

Claims

1. high-isolation wavelength division multiplexer, form by double-fiber collimator WDM diaphragm and single fiber collimater and housing etc., it is characterized in that: on the double optical fiber head exiting surface in double-fiber collimator, contain the otpical leaf that is fixed with the band anti-reflection film on the double optical fiber head exiting surface of incident light optical fiber respectively, be fixed with the WDM diaphragm containing on the double optical fiber head exiting surface of reverberation optical fiber.

2. a kind of high-isolation wavelength division multiplexer according to claim 1, it is characterized in that: a part is with anti-reflection film simultaneously on same otpical leaf, another part band WDM film, be fixed on the double optical fiber head exiting surface, should guarantee the anti-reflection film part at incident light optical fiber on one side, band WDM diaphragm is at the double-fiber collimator receiving terminal.

3. a kind of high-isolation wavelength division multiplexer according to claim 1, it is characterized in that: on the double optical fiber head light output end, can directly contain direct plating anti-reflection film on two optical fiber light-coming out optical fiber end faces of incident light optical fiber, the end face of accepting light at double-fiber collimator directly plates the WDM film.