CN1231781C

CN1231781C - Optical transmitting and receiving device

Info

Publication number: CN1231781C
Application number: CNB031313469A
Authority: CN
Inventors: 京谷升一
Original assignee: Alps Electric Co Ltd
Current assignee: Alps Alpine Co Ltd
Priority date: 2002-05-15
Filing date: 2003-05-14
Publication date: 2005-12-14
Anticipated expiration: 2023-05-14
Also published as: TWI234020B; KR20030089633A; TW200407580A; KR100504224B1; CN1460872A; JP2003329897A; JP3978078B2

Abstract

The present invention provides an optical signal receiving and transmitting apparatus that is capable of reducing the optical device as much as possible and using multiple interchangeable components in the first and the second optical modules to reduce the manufacturing cost. The first and the second optical modules (30, 60) include the followings: the light-emitting devices (52, 82), which emit light with the first wavelength or the second wavelength (lambda1, lambda2); light-receiving devices (53, 83), which receive light from the optical fiber (12); the optical members (40, 70), which collect the emitted light from light-emitting device at the optical fiber simultaneously; and the first and the second diffraction gratings (42, 72), which emit straightly propagating light from the light-emitting device toward the optical fiber side and emit the diffracted light from the optical fiber toward the light-receiving device. The separation pitch of the first diffraction grating is P1, and that of the second diffraction grating is P2, in which P2 is equal to the value of P1x(lambda1/lambda2).

Description

Optical transceiver

Technical field

The present invention relates to optical transceiver, and relate to instrument (tool) universalization that can realize parts, assembling and can the cheap optical transceiver of making.

Background technology

Be connected at 2 optical assemblies (module) 20 of the terminal of optical communication with optical fiber 12, when long distance High-speed is transmitted the signal of big data quantity, the structure of optical assembly 20 such as Fig. 3.In this embodiment, each optical assembly 20 is injected the 1st wavelength that sends from the laser diode 11 as light-emitting component to optical fiber 12 and (is sent λ=1310nm from a side, the opposing party sends the light of λ=1550nm), the photodiode 13 that is used as photo detector simultaneously receives other wavelength of penetrating from optical fiber 12, and (send λ=1550nm from a side, the opposing party sends λ=1310nm).

And, this optical transceiver comprises: the 1st collimation lens (collimation lens) 21 that is provided with near laser diode 11, the 2nd collimation lens 22 that is provided with near optical fiber 12, and near photodiode 13 and the 3rd collimation lens 23 that is provided with; The light filter 24 that between the 1st and the 2nd collimation lens 21,22, disposes with respect to inclined light shaft 45 degree.

If select this optical transceiver, then the light of the 1st wavelength X 1 that radiates from the light-emitting component 15 of laser diode 11 becomes parallel rays by the 1st collimation lens 21, sees through light filter 24, injects in the optical fiber 12 by the 2nd collimation lens optically focused.

And the light of the 2nd wavelength X 2 that penetrates from optical fiber 12 becomes parallel rays by collimation lens 22, with light filter 24 reflections, injects by the 3rd collimation lens optically focused in the photo detector 14 of photodiode 13.

, in the optical transceiver of above-mentioned the past, the light filter that adopts 3 collimation lenses and overlapping multilayer film to constitute, number of elements is many.And each element is special-purpose for the transmission light wavelength, and the allocation position of each element must change, and component kind is many.Therefore, assembling is adjusted bothersome, and cost increases.

Summary of the invention

The purpose of this invention is to provide and to reduce optical element quantity, and in the 1st and the 2nd optical assembly, use a plurality of universal components, can reduce the optical transceiver of manufacturing cost.

In the present invention, constituted following optical transceiver in order to address the above problem.

Optical transceiver among the present invention, a kind of optical transceiver connects the 1st optical assembly and the 2nd optical assembly with optical fiber, and the transmission of carrying out light signal between two optical assemblies receives,

The 1st optical assembly comprises: the 1st light-emitting component of launching the 1st wavelength (λ 1) light; Reception is from the 1st photo detector of the 2nd wavelength (λ 2) light of optical fiber; Assemble aforementioned the 1st wavelength light and assemble the optical component of aforementioned the 2nd wavelength light to optical fiber to aforementioned the 1st photo detector; Directly advance light to what the optical fiber side penetrated aforementioned the 1st wavelength, shoot out the 1st diffraction lattice from the 2nd wavelength diffraction light of optical fiber to aforementioned the 1st photo detector side;

The 2nd optical assembly comprises: the 2nd light-emitting component of launching the 2nd wavelength light; Reception is from light

The 2nd photo detector of the 1st fine wavelength light; That assemble aforementioned the 2nd wavelength light to optical fiber and conduct the optical component of aforementioned the 1st wavelength light; Directly advance light to what the optical fiber side penetrated aforementioned the 2nd wavelength light, shoot out the 2nd diffraction lattice from the diffraction light of the 1st wavelength light of optical fiber to aforementioned the 2nd photo detector side;

The spacing of above-mentioned the 1st diffraction lattice is P1, the spacing P2 of the 2nd diffraction lattice is P1 * (λ 1/ λ 2), be configured in the angle of diffraction of the 2nd wavelength light that the 1st diffraction lattice of the 1st optical assembly produces, the angle of diffraction of the 1st wavelength light that produces with the 2nd diffraction lattice that is configured in the 2nd optical assembly equates.

If select aforementioned invention, can reduce the quantity of collimation lens, and owing to the 2nd wavelength (λ 2) the diffraction of light angle that can make by the 1st diffraction lattice that is disposed at the 1st optical assembly, equate with the 1st wavelength (λ 1) the diffraction of light angle of the 2nd diffraction lattice by being disposed at the 2nd optical assembly, so can in two assemblies, use housing and other members of constituting the 1st and the 2nd optical assembly jointly, and can make that the instrument (tool) that is used to assemble adjustment can be public.

And in the optical transceiver of the present invention, the optical component in each optical assembly will constitute through the convex lens that diffraction lattice gathers each photo detector from the light of optical fiber by gathering fiber end face through diffraction lattice from the light of each light-emitting component.

If the optical transceiver of selecting aforementioned optical component to be made of convex lens, then available minimum optical element is to the collect light of self-emission device of optical fiber, and collects from the light of optical fiber to photo detector.

Also have, optical transceiver of the present invention, a face of diffraction lattice and aforementioned optical component forms one.

The present invention makes a face of diffraction lattice and optical component form one, can make optical component and diffraction lattice with the mold forming processing method, thereby can reduce processing capacity, and, optical component and diffraction lattice need not be assembled, and can save and assemble man-hour, remove the position adjustment between two members from.

Description of drawings

Fig. 1: the figure that is the formation of expression optical transceiver one sidelight assembly of the present invention

Fig. 2: the figure that is the formation of expression optical transceiver opposite side optical assembly of the present invention

Fig. 3: the figure that is expression optical transceiver in the past

Embodiment

Below, embodiments of the present invention are described with reference to the accompanying drawings.Fig. 1 and Fig. 2 are the synoptic diagram of expression about each

optical assembly

30,60 of the embodiment of optical transceiver of the present invention.

Constituting the

optical assembly

30,60 of the optical transceiver of present embodiment, is with single-mode fiber 12 the device combination of the 1st optical assembly 30 shown in Figure 1 and the 2nd optical assembly 60 shown in Figure 2 to be formed.

The 1st optical assembly 30 is connected in the optical element 40 of single-mode fiber 12 and is sent receiving element 50 by optics and constitute as shown in Figure 1.

(laser diode of the light-emitting component of laser (LD) 52 of λ in this example=1310nm), photodiode (PD) 53 that efficiently receives the 2nd wavelength (λ 2=1550nm in this example) light dispose apart from d, dispose with the optical axis distance D of optical element 40 with send the 1st wavelength on substrate 51 to send receiving element 50.And the light filter of unnecessary light in light and the incident light is penetrated in figure number 54 expression blockings among Fig. 1.

Optical element 40 has the formed aspheric surface convex lens 41 of optical fiber 12 lateral processes at substrate 43.This optical element 40 also has grid face 42.Grid face 42 is injected the 1st wavelength from aforementioned laser diode 52 in the transmission receiving element side side of substrate 43 to optical fiber 12, and (light of λ in this example=1310nm) is injected the 2nd wavelength that penetrates from the optical fiber 12 (light of λ this example=1550nm) to the photodiode 53 of photo detector simultaneously.

It is that following condition is selected that this grid face 42 makes the spacing P1 of grid:

1. see through light with 1310nm light as 0 time and make it efficiently to see through;

2. make it efficiently to see through as 1 diffraction light with 1550nm light,

For example select P1=20 μ m, satisfy aforementioned condition thus.

And convex lens and grid face can be selected its characteristic as required, also can select its shape.

The 2nd optical assembly uses single mode as shown in Figure 2, is connected in the optical element 70 of the optical fiber 12 that is connected with the 1st optical assembly 30 and is sent receiving element 80 by optics to constitute.

Send receiving element 80 and on substrate 81, send the 1st wavelength and (the light-emitting component laser diode (LD) 82 of the laser of λ in this example=1550nm), efficiently receive the photodiode (PD) 83 of the 2nd wavelength (λ 2=1310nm in this example) light apart from d (Fig. 2, with the 1st optical assembly be same size) dispose, dispose with the optical axis distance D of optical element 70 (Fig. 2, with the 1st optical assembly be same size).And the light filter of unnecessary light in light and the incident light is penetrated in figure number 84 expression blockings among Fig. 2.

Optical element 70 is included in the formed aspheric surface convex lens 81 of optical fiber 12 lateral processes.And this optical element 70 also comprises grid face 42.Grid face 42 is injected the 1st wavelength from aforementioned laser diode 82 in the transmission receiving element side side of substrate 73 to optical fiber 12, and (light of λ in this example=1550nm) is injected the 2nd wavelength that penetrates from the optical fiber 12 (light of λ this example=1310nm) to photo detector photodiode 83 simultaneously.

1. see through light with 1550nm light as 0 time and make it efficiently to see through;

2. make it efficiently to see through as 1 diffraction light with 1310nm light,

For example select P2=P1 (1310/1550) 17 μ m.

By such selection, convex lens and grid face can be selected its characteristic as required, also can select its shape.And it can be made and the measure-alike assembly of the 1st optical assembly.

More than be the embodiments of the present invention explanations, but the invention is not restricted to above-mentioned example, its purport can be changed in the scope that does not transfinite.

The invention effect

As described above, if select optical transceiver of the present invention for use, can obtain following excellent results:

According to the present invention, can reduce the quantity of collimation lens, and, owing to be disposed at the 2nd wavelength (λ 2) the diffraction of light angle of the 1st diffraction lattice on the 1st optical assembly, can equate with the 1st wavelength (λ 1) the diffraction of light angle of the 2nd diffraction lattice on being disposed at the 2nd optical assembly, so can make housing and other members of constituting the 1st and the 2nd optical assembly general in two assemblies, and the instrument (tool) that can be used in the assembling adjustment is general.

And if the optical transceiver of selecting for use optical component to be made of convex lens, the available minimum optical element light of self-emission device in the future is collected among the optical fiber, and will be collected in the photo detector from the light of optical fiber.

Also have, the present invention makes a face of diffraction lattice and optical component form one, can make optical component and diffraction lattice with the mold forming processing method, thereby can reduce processing capacity, and optical component and diffraction lattice need not be assembled, can assemble man-hour in saving, remove the position adjustment between two members from.

Claims

1. an optical transceiver connects the 1st optical assembly and the 2nd optical assembly with optical fiber, and the transmission of carrying out light signal between two optical assemblies receives,

The 1st optical assembly comprises: the 1st light-emitting component of launching the 1st wavelength X 1 light; Reception is from the 1st photo detector of the 2nd wavelength X 2 light of optical fiber; Assemble aforementioned the 1st wavelength light and assemble the optical component of aforementioned the 2nd wavelength light to optical fiber to aforementioned the 1st photo detector; Directly advance light to what the optical fiber side penetrated aforementioned the 1st wavelength, shoot out the 1st diffraction lattice from the 2nd wavelength diffraction light of optical fiber to aforementioned the 1st photo detector side;

The 2nd optical assembly comprises: the 2nd light-emitting component of launching the 2nd wavelength light; Reception is from the 2nd photo detector of the 1st wavelength light of optical fiber; That assemble aforementioned the 2nd wavelength light to optical fiber and conduct the optical component of aforementioned the 1st wavelength light; Directly advance light to what the optical fiber side penetrated aforementioned the 2nd wavelength light, shoot out the 2nd diffraction lattice from the diffraction light of the 1st wavelength light of optical fiber to aforementioned the 2nd photo detector side;

The spacing of above-mentioned the 1st diffraction lattice is P1, and the spacing P2 of the 2nd diffraction lattice is P1 * (λ 1/ λ 2),

Be configured in the angle of diffraction of the 2nd wavelength light that the 1st diffraction lattice of the 1st optical assembly produces, the angle of diffraction of the 1st wavelength light that produces with the 2nd diffraction lattice that is configured in the 2nd optical assembly equates.

2. the optical transceiver of putting down in writing according to claim 1, the optical component in each optical assembly will constitute through the convex lens that diffraction lattice gather each photo detector from the light of optical fiber by gathering fiber end face through diffraction lattice from the light of each light-emitting component.

3. the optical transceiver of putting down in writing according to claim 1 or claim 2, a face of diffraction lattice and aforementioned optical component forms one.