CN1402447A

CN1402447A - Refraction and diffraction hybrid wavelength devision multiplexing method and structure

Info

Publication number: CN1402447A
Application number: CN02133165A
Authority: CN
Inventors: 于斌; 于秉熙
Original assignee: Changchun Institute of Optics Fine Mechanics and Physics of CAS
Current assignee: Changchun Institute of Optics Fine Mechanics and Physics of CAS
Priority date: 2002-10-10
Filing date: 2002-10-10
Publication date: 2003-03-12

Abstract

With being output from the input optical fiber and the fiber couple device passing through the refraction and diffraction component, the collimating process and the spectrum process of the optical signal with multiple wavelengths is carried out. The lens can change the caliber of the diffraction light beam. Finally, the light with multiple wavelengths is leaded into the relevant optical fibers so as to realize the wavelength division multiplex. The devices of the wavelength division multiplex includes the input fiber, the couple device of the input fiber, the refraction and diffraction components, the lens, the self-focusing lens array and the tail fiber. The refraction and diffraction components used in the invention is the binary optical diffraction grating that can be mass-produced so as to lower the manufacturing difficulty and cost.

Description

A kind of novel Refraction and diffraction hybrid wavelength devision multiplexing method and structure

Technical field: the invention belongs to technical field of optical fiber communication, relate to a kind of structure that realizes wavelength division multiplexing and partial wave and close wave method.

Background technology: wavelength division multiplexing is that the light carrier of different wave length coexists and transmits on the optical fiber, and its essence is exactly optical fiber frequency multiplexing technique, and promptly each path is multiplexing by realizing cutting apart of frequency domain, and each path takies one section bandwidth of optical fiber.Wavelength division multiplexer/demultiplexer spare is the important component part of wavelength-division multiplex system, is the Primary Component of realizing wavelength division multiplexing communications, and the light that it will carry different wave length information converges to the optical fiber or from an optical fiber from multifiber and is separated to the multifiber.According to realizing principle, light wavelength division multiplexing mainly can be divided into four classes: the first kind is the grating type wavelength division multiplexer, and it adopts the grating beam splitting principle to realize dividing, closing ripple; Second class is an interference thin film type wavelength division multiplexer, and it adopts the filtering principle of interference thin film to realize dividing, closing ripple; The 3rd class is the planar waveguide-type wavelength division multiplexer, and it adopts, and the interference of light principle realizes dividing, closing ripple in the fiber waveguide; The 4th class is the grating type optical fiber wavelength division multiplexer, and it adopts the filtering principle of fiber grating to realize dividing, closing ripple.As shown in Figure 1: in traditional grating type wavelength division multiplexer, mainly be to constitute by input optical fibre array 1, collimation/condenser lens 2, balzed grating, 3 and output optical fibre array 4.Insert loss for reducing, generally just use balzed grating, as light-splitting device, the major defect of this class device is the manufacturing difficulty of balzed grating,, beam splitting system complex structure, cost height.

Detailed content of the present invention: the objective of the invention is to overcome balzed grating, manufacturing difficulty in the above-mentioned prior art, the beam splitting system complex structure, the shortcoming that cost is high, the present invention proposes a kind of manufacturing simple in structure, easy, wavelength division multiplexing method and structure that cost is low for this reason.

Method of the present invention is: the light signal that at first allows input optical fibre export a plurality of wavelength through fiber coupling device spreads out through folding, and hybrid element collimates, the diffraction beam split, by lens the light beam that diffraction goes out is carried out aperture transform again, light with the different wave length of apart is incorporated in the corresponding optical fiber by condenser lens at last, realize multiple wavelength optical signal ripple, divide multiplexing.

Structure of the present invention is to be made of input optical fibre, input optical fibre coupling device, refraction/diffraction mixed optical element, lens, selfoc lens array and tail optical fiber, the optical axis coincidence of the central axis of input optical fibre and input optical fibre coupling device and refraction/diffraction mixed optical element, and the outgoing end face of optical fiber is arranged in the focus place of refraction/diffraction mixed optical element planoconvex spotlight; The focus of plano-convex refractor and lens, optical axis coincidence constitute telescopic system in the refraction/diffraction mixed optical element; The telescopic system doubling light beam that the mixed optical element diffraction goes out that spreads out carries out the beam size conversion, the light that forms different wave length is after certain free space is propagated, also enter selfoc lens array respectively in apart, each GRIN Lens is incorporated into the light of different wave length in the space in the coupled tail optical fiber.The refraction/diffraction mixed optical element is by the plano-convex refractor, and binary diffractive optic grating and aberration correction are partly formed, and the binary diffractive optic grating is fixedlyed connected with the plane of plano-convex refractor with the aberration correction part.

Dynamic duty process of the present invention is: incide through the input optical fibre coupling device when composite optical signal enters optical fiber that the refraction/diffraction mixed optical element collimates, beam split, carry out the beam size conversion, freely propagate into the partial wave that selfoc lens array imports to realization light in the tail optical fiber then through lens again, oppositely use can realize the ripple that closes of light.

Advantage of the present invention is: the binary diffractive optic grating adopts the photoetching process manufacturing, need the width and the degree of depth of step in the control binary diffractive optic grating in the manufacturing, it is ripe to be exclusively used in the photoetching process of making the binary diffractive optic grating at present, the binary diffractive optic grating is convenient to a large amount of productions, the rate of finished products height, cost is low.The present invention has prepared plano-convex refractor, binary diffractive optic grating and aberration correction and has been combined into the refraction/diffraction mixed optical element on a substrate, solved system configuration complicated problems in the background technology, and simplied system structure reduces device size; And utilize the binary optical manufacturing technology to make the binary diffractive optic grating, to avoid the difficulty in the balzed grating, manufacturing, reduce the manufacture difficulty and the cost of grating type WDM structure.

Utilize the channel spacing of the wavelength division multiplex device that the present invention develops to reach the wavelength division multiplexing minimum interval 100GHz that ITU-T recommends, can produce with traditional based on the suitable device of the wavelength division multiplex device technical merit of balzed grating.The present invention is mainly used in fields such as optical communication, spectral instrument.

Description of drawings:

Fig. 1 is the structural representation of background technology

Fig. 2 is a structural representation of the present invention

Fig. 3 is the structural representation that the present invention rolls over the element that spreads out

Embodiment such as Fig. 2, shown in Figure 3:

Structure of the present invention is made of optical fiber 1, input optical fibre coupling device 2, refraction/diffraction mixed optical element 3, lens 4, self-aggregation lens array component 5 and tail optical fiber 6.Whole system is operated near infrared region (1.55 mum wavelengths), and optical fiber 1, input optical fibre coupling device 2, lens 4, self-aggregation lens array component 5 and tail optical fiber 6 can determine that its model directly buys according to the requirement of system design parameters.

With reference to Fig. 2, the refraction/diffraction mixed optical element 3 in the system should be selected the big material of 1.55 mum wavelength infrared light transmitances for use, as polymeric materials such as acrylic acid, styrene, Polycarbonate plastics, and the plating anti-reflection film.Refraction/diffraction mixed optical element 3 is by plano-convex refractor 7, binary diffractive optic grating 8 and aberration correction part 9 are formed, wherein binary diffractive optic grating 8 employing number of steps are the preiodic type grating of 2n, n is an integer, according to actual instructions for use design cycle and shoulder height, be used to control the blaze wavelength of binary diffractive optic grating 8.Binary diffractive optic grating 8 is to adopt the manufacturing of optical semiconductor carving technology.

Claims

1, a kind of novel Refraction and diffraction hybrid wavelength devision multiplexing method, it is characterized in that: the light signal that at first allows input optical fibre export a plurality of wavelength through fiber coupling device spreads out through folding, and element collimates, the diffraction beam split, by lens the light beam that diffraction goes out is carried out aperture transform again, to be incorporated in the corresponding optical fiber by condenser lens by the light of different wave length after apart at last, ripple, the branch of realization multiple wavelength optical signal are multiplexing.

2, a kind of novel Refraction and diffraction hybrid wavelength devision multiplexing structure, comprise: input optical fibre 1, tail optical fiber 6, it is characterized in that also comprising: input optical fibre coupling device 2, refraction/diffraction mixed optical element 3, lens 4, selfoc lens array 5, the optical axis coincidence of the central axis of input optical fibre 1 and input optical fibre coupling device 2 and refraction/diffraction mixed optical element 3, and the outgoing end face of optical fiber 1 is arranged in the focus place of refraction/diffraction mixed optical element 3 planoconvex spotlights; Plano-convex refractor 7 constitutes telescopic system with focus, the optical axis coincidence of lens 4 in the refraction/diffraction mixed optical element 3; The telescopic system doubling light beam that mixed optical element 3 diffraction go out that spreads out carries out the beam size conversion, the light that forms different wave length is after certain free space is propagated, also enter selfoc lens array 5 respectively in apart, each GRIN Lens is incorporated into the light of different wave length in the space in the coupled tail optical fiber 6.

3, Refraction and diffraction hybrid wavelength devision multiplexing structure according to claim 2, it is characterized in that: refraction/diffraction mixed optical element 3 is by plano-convex refractor 7, binary diffractive optic grating 8 and aberration correction part 9 are formed, and binary diffractive optic grating 8 is fixedlyed connected with the plane of plano-convex refractor 7 with aberration correction part 9.