CN204086729U - A kind of long wavelength's isolator using three short wavelength's Faraday systems to do - Google Patents

Abstract

The utility model provides a kind of long wavelength's isolator using three short wavelength's Faraday systems to do, to solve the short problem of existing optoisolator applicable wavelengths.A kind of long wavelength's isolator using three short wavelength's Faraday systems to do, comprise external package pipe and magnet ring, described magnet ring is socketed in described external package pipe, be bonded with isolating chip in described magnet ring, described isolating chip is made up of the incident polarizer overlayed together, first method Faraday body, the second Faraday body, the 3rd Faraday body and outgoing polarization sheet optical adhesive bonding.The utility model realizes the isolator demand of high wavelength by three short wavelength's Faraday bodies, thus reduces costs the shortening cycle.

Description

A kind of long wavelength's isolator using three short wavelength's Faraday systems to do

Technical field

The utility model relates to the optical device in optical-fibre communications field, particularly a kind of long wavelength's isolator using three short wavelength's Faraday systems to do.

Background technology

The purposes of free space isolator is the harmful effect preventing the reverse transfers light produced due to a variety of causes in light path from producing light source and light path system.Be mainly used in optical transmission system (product is as: light transmitting-receiving emitter etc.) and individual laser package (product as: laser diode module, fiber instrument instrument etc.).Along with the fast development of domestic and international optical communication industry, the field of application is more and more extensive.And traditional free space isolator wavelength coverage can only reach 1610nm, the isolator of the higher wavelength needed in practical application cannot reach.

The detection of harmful gas, be always the whole world all in the common difficulty of active research and solution, traditional detection mode is limited to equipment volume, it is inaccurate to measure, and the shortcoming such as must to contact.According to the spectral characteristic of harmful gas, the principle that its vibration frequency is consistent with 1650 ~ 2000nm spectral characteristic, need use the isolator of high wavelength, be assemblied in laser instrument, guarantee accurate measurement.

Utility model content

The utility model provides a kind of long wavelength's isolator using three short wavelength's Faraday systems to do, to solve the short problem of existing optoisolator applicable wavelengths.

The technical solution of the utility model is achieved in that a kind of long wavelength's isolator using three short wavelength's Faraday systems to do, comprise external package pipe and magnet ring, described magnet ring is socketed in described external package pipe, be bonded with isolating chip in described magnet ring, described isolating chip is made up of the incident polarizer overlayed together, first method Faraday body, the second Faraday body, the 3rd Faraday body and outgoing polarization sheet optical adhesive bonding.

Wherein, preferably, the Faraday body of described first faraday's optically active form to be wavelength be 599nm, the Faraday body of described second Faraday body to be wavelength be 599nm, the Faraday body of described 3rd Faraday body to be wavelength be 599nm.

Wherein, preferably, the Faraday body of described first faraday's optically active form to be wavelength be 581nm, the Faraday body of described second Faraday body to be wavelength be 581nm, the Faraday body of described 3rd Faraday body to be wavelength be 581nm.

Wherein, preferably, the xsect of incident polarizer, first method Faraday body, the second Faraday body, described 3rd Faraday body and outgoing polarization sheet is square.

The beneficial effects of the utility model:

The utility model realizes the isolator demand of high wavelength by three short wavelength's Faraday bodies, thus reduces costs the shortening cycle.

Accompanying drawing explanation

In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiments more of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.

Fig. 1 is the sectional view of the utility model embodiment;

Fig. 2 is the vertical view of Fig. 1;

In figure, 1. external package pipe, 2. magnet ring, 3. isolating chip, 31. incident polarizer, 32. first faraday's optically active forms, 33. second Faraday bodies, 34. the 3rd Faraday bodies, 35. outgoing polarization sheets, 36. optical adhesives.

Embodiment

Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.

As depicted in figs. 1 and 2, the present embodiment provides a kind of long wavelength's isolator using three short wavelength's Faraday systems to do, comprise external package pipe 1 and magnet ring 2, magnet ring 2 is socketed in external package pipe 1, be bonded with isolating chip 3 in magnet ring 2, isolating chip 3 is bonded by optical adhesive 36 and is made up of the incident polarizer 31 overlayed together, first method Faraday body, the second Faraday body 33, the 3rd Faraday body 34 and outgoing polarization sheet 35.

Wherein, first faraday's optically active form 32 for wavelength be the Faraday body of 599nm, the second Faraday body 33 for wavelength be the Faraday body of 599nm, the 3rd Faraday body 34 for wavelength be the Faraday body of 599nm.By three 599nm Faraday bodies, the 1795nm insulator functionality that we need can be realized.

Wherein, the xsect of incident polarizer 31, first method Faraday body, the second Faraday body 33, the 3rd Faraday body 34 and outgoing polarization sheet 35 is square.Logical optical adhesive 36 is bonded in magnet ring 2.

In the utility model, Faraday body also can be following wavelength: first faraday's optically active form 32 for wavelength be the Faraday body of 581nm, second Faraday body 33 for wavelength be the Faraday body of 581nm, the 3rd Faraday body 34 for wavelength be the Faraday body of 581nm.By three 581nm Faraday bodies, the 1742nm insulator functionality that we need can be realized.

Principle of work: invent and be made up of incident polarizer, three Faraday bodies, outgoing polarization sheet and magnet rings etc.When wavelength is λ ₀light forward when passing through:

$E_{\mathrm{out}}=P_{\mathrm{out}}\left[{\mathrm{\Π}}_m^{i=1}M\left({\mathrm{\λ}}_i\right)\right]P_{\mathrm{in}}{E}_{\mathrm{in}}---\left(1\right)$

Wherein

$E_{\mathrm{in}}=\left[\begin{array}{c}{E}_0\\ 0\end{array}\right]$ For the incident light electric field of horizontal polarization

$P_{\mathrm{in}}\left(0\right)=\left[\begin{array}{cc}1& 0\\ 0& 0\end{array}\right]$ For the incident polarizer of horizontal positioned

$M\left({\mathrm{\λ}}_i\right)=\left[\begin{array}{cc}\cos (\mathrm{\π}{\mathrm{\λ}}_i/{4\mathrm{\λ}}_0)& -\sin (\mathrm{\π}{\mathrm{\λ}}_i/{4\mathrm{\λ}}_0)\\ \sin (\mathrm{\π}{\mathrm{\λ}}_i/{4\mathrm{\λ}}_0)& \cos (\mathrm{\π}{\mathrm{\λ}}_i/{4\mathrm{\λ}}_0)\end{array}\right]$ For short wavelength λ _i45 degree of faraday rotators

$P_{\mathrm{out}}=\left[\begin{array}{cc}{\sin }^2{\mathrm{\θ}}_0& \sin {\mathrm{\θ}}_0\cos {\mathrm{\θ}}_0\\ \sin {\mathrm{\θ}}_0\cos {\mathrm{\θ}}_0& {\cos }^2{\mathrm{\θ}}_0\end{array}\right]$ For θ ₀the outgoing polarization sheet that angle is placed

Bring into above various, and notice

${\mathrm{\Π}}_m^{i=1}M\left({\mathrm{\λ}}_i\right)=M\left({\mathrm{\Σ}}_m^{i=1}{\mathrm{\λ}}_i\right)$

The forward transmitance T of isolator is

$T={|E_{\mathrm{out}}/E_{\mathrm{in}}|}^2=\sin ({\mathrm{\θ}}_0+\frac{\mathrm{\π}}{{4\mathrm{\λ}}_0}{\mathrm{\Σ}}_m^{i=1}{\mathrm{\λ}}_i)---\left(2\right)$

In like manner, along θ ₀direction polarization feedback light back through time, feedback light is expressed as through electric field

$E_{\mathrm{iso}}=P_{\mathrm{in}}\left[{\mathrm{\Π}}_1^{i=m}M\left({\mathrm{\λ}}_i\right)\right]P_{\mathrm{out}}{E}_{\mathrm{Ref}}---\left(3\right)$

Wherein $E_{\mathrm{ref}}=\left[\begin{array}{c}{\sin \mathrm{\θ}}_0\\ \cos {\mathrm{\θ}}_0\end{array}\right]$ E ₀for polarization direction is θ ₀feedback light electric field

Can be derived as from above formula back through rate R:

$R={|E_{\mathrm{iso}}/E_{\mathrm{ref}}|}^2=\sin ({\mathrm{\θ}}_0-\frac{\mathrm{\π}}{{4\mathrm{\λ}}_0}{\mathrm{\Σ}}_m^{i=1}{\mathrm{\λ}}_i)---\left(4\right)$

By desirable isolator condition R=0 and T=1, draw

From formula 5, by three 599nm Faraday bodies, the 1795nm insulator functionality that we need can be realized; By three 581nm Faraday bodies, the 1795nm insulator functionality that we need can be realized.

The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all within spirit of the present utility model and principle, any amendment done, equivalent replacement, improvement etc., all should be included within protection domain of the present utility model.

Claims (4)

1. the long wavelength's isolator using three short wavelength's Faraday systems to do, comprise external package pipe and magnet ring, described magnet ring is socketed in described external package pipe, be bonded with isolating chip in described magnet ring, it is characterized in that: described isolating chip is made up of the incident polarizer overlayed together, first method Faraday body, the second Faraday body, the 3rd Faraday body and outgoing polarization sheet optical adhesive bonding.

2. a kind of long wavelength's isolator using three short wavelength's Faraday systems to do according to claim 1, it is characterized in that: the Faraday body of described first faraday's optically active form to be wavelength be 599nm, the Faraday body of described second Faraday body to be wavelength be 599nm, the Faraday body of described 3rd Faraday body to be wavelength be 599nm.

3. a kind of long wavelength's isolator using three short wavelength's Faraday systems to do according to claim 1, it is characterized in that: the Faraday body of described first faraday's optically active form to be wavelength be 581nm, the Faraday body of described second Faraday body to be wavelength be 581nm, the Faraday body of described 3rd Faraday body to be wavelength be 581nm.

4. a kind of long wavelength's isolator using three short wavelength's Faraday systems to do according to any one of claims 1 to 3, is characterized in that: the xsect of described incident polarizer, described first method Faraday body, the second Faraday body, described 3rd Faraday body and outgoing polarization sheet is square.