Three-dimensional tunable coupling packaging structure based on PPLN waveguide device

Abstract

The utility model relates to a three-dimensional tunable coupling packaging structure based on a PPLN waveguide device. The three-dimensional tunable coupling packaging structure comprises a waveguide device internally provided with an installation cavity, a waveguide chip fixedly assembled in the installation cavity, and an optical fiber patch cord connector movably assembled in the installation cavity. The waveguide chip is provided with at least two waveguide channels, and the waveguide channels correspond to different polarization periods; and a position adjusting mechanism used for adjusting the position of the optical fiber patch cord connector so as to enable the axis of the optical fiber patch cord connector to be coaxially matched with each waveguide channel in a one-to-one manner to realize coupling is arranged in the mounting cavity. A user can realize matching wavelength adaptation in a larger range under the condition that a waveguide device is not replaced; therefore, high-conversion-efficiency output light of the corresponding matched wavelength is realized.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of optical communication device, concretely relates to a three -dimensional tunable coupling package structure based on PPLN waveguide device. BACKGROUND

[0002] PPLN is a kind of high-efficiency wavelength conversion nonlinear crystal, and the light transmission range is wide, covering near-infrared, mid-infrared region, and the service life is long, can be used for frequency doubling, difference frequency, sum frequency and optical parametric oscillation and optical parametric amplification etc. Nonlinear optical process, PPLN waveguide appeared in recent years due to its unique waveguide channel structure, its optical confinement effect is stronger, thereby greatly improving the nonlinear optical effect of PPLN waveguide.

[0003] Through the search of the related technical literature of the prior art, it is found that the coupling mode of the existing PPLN waveguide chip and optical fiber jumper as shown in Figure 1 It includes ridge waveguide, polarization maintaining or single-mode optical fiber, the existing PPLN waveguide device in the process of packaging, waveguide chip is often directly pasted with optical fiber jumper using special glue curing, in the fixed input end coupling mode, also limit the waveguide transmission channel, waveguide channel planning period corresponds to matching wavelength, if wanting to expand matching wavelength range, the existing technology adopts the following mode: 1, replace different waveguide devices, different waveguide devices correspond to different single polarization period, by replacing waveguide to realize the expansion of matching wavelength, this mode needs to use multiple waveguide devices, causes cost increase;2, use the waveguide device of chirped period, the waveguide device of chirped period refers to the uniform transmission channel in waveguide containing different polarization periods, and then matching wider matching wavelength range, but this mode will reduce the nonlinear conversion efficiency of single wavelength in matching wavelength range. UTILITY MODEL CONTENT

[0004] The utility model aims at providing a three-dimensional tunable coupling package structure based on PPLN waveguide device to solve the problems of increasing cost due to replacing waveguide components and reducing nonlinear conversion efficiency due to using the waveguide device of chirped period in the prior art to adapt to wider wavelength range.

[0005] In order to solve the above problems, the three-dimensional tunable coupling package structure based on PPLN waveguide device related by the utility model adopts the following technical scheme:

[0006] The three-dimensional tunable coupling package structure based on PPLN waveguide device includes waveguide device with mounting cavity inside, waveguide chip fixedly assembled in mounting cavity and optical fiber jumper connector movably assembled in mounting cavity;

[0007] At least two waveguide channels are arranged on the waveguide chip, and each waveguide channel corresponds to different polarization period.

[0008] The installation cavity is provided with a position adjusting mechanism for adjusting the position of the fiber jumper connector so that the axis of the fiber jumper connector is coaxially matched with each waveguide channel to realize coupling.

[0009] Further, the waveguide channel extends along the X direction, the position adjusting mechanism comprises an X direction adjusting frame, a Y direction adjusting frame and a Z direction adjusting frame which are stacked along the Z direction, and the fiber jumper connector is fixed on the Z direction adjusting frame.

[0010] Further, a slide channel extending along the X direction is arranged on the side of the installation cavity which is located at the input end of the waveguide channel, the X direction adjusting frame is movably arranged on the slide channel in a guided manner, and the X direction side of the waveguide device is provided with an X direction driving member for adjusting the X direction position of the X direction adjusting frame.

[0011] Further, the Y direction adjusting frame is movably arranged on the X direction adjusting frame in a guided manner along the Y direction, and the Z direction adjusting frame is movably arranged on the Y direction adjusting frame in a guided manner along the Z direction.

[0012] Further, an X direction return spring is connected between the X direction adjusting frame and the waveguide device to apply an action force to the X direction adjusting frame to move back to the waveguide channel, the X direction driving member is an X direction knob which is screwed on the waveguide device and is in abutting contact with the X direction adjusting frame, a Y direction return spring is arranged on the X direction adjusting frame and the Y direction adjusting frame, a Y direction knob is arranged on the side wall of the waveguide device, a Z direction spring is arranged on the Y direction adjusting frame and the Z direction adjusting frame, and a Z direction knob is arranged on the top wall of the waveguide device.

[0013] Further, the slide channel and the waveguide channel are spaced apart.

[0014] Further, a perspective window is arranged on the waveguide device which is located at the coupling end of the waveguide channel.

[0015] Further, a temperature control base is arranged on the bottom of the waveguide chip.

[0016] Compared with the prior art, the three-dimensional tunable coupling packaging structure based on the PPLN waveguide device, by arranging a position adjusting mechanism in the installation cavity of the waveguide device, the fiber jumper connector is arranged on the position adjusting mechanism, different waveguide channels are arranged on the waveguide chip to correspond to different polarization periods (also correspond to different matching wavelengths). The input light is input to the polarization maintaining optical fiber, the fiber jumper connector is moved to the position of coupling with the corresponding waveguide channel through the position adjusting mechanism, so as to realize the free coupling of the input optical fiber and the PPLN waveguide chip, and finally the user can realize the matching wavelength adaptation in a larger range without replacing the waveguide device; so as to realize the output of the corresponding matching wavelength with high conversion efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to make the technical scheme of the embodiments of the present application clearer, the drawings needed in the embodiments will be briefly introduced as follows:

[0018] Figure 1 is a structural schematic view of a specific embodiment of the three-dimensional tunable coupling packaging structure based on a PPLN waveguide device of the present application;

[0019] Figure 2 is a perspective view of Figure 1 ;

[0020] Figure 3 is a structural schematic view of a position adjusting mechanism in Figure 2 .

[0021] Mark 1-waveguide device 1; 11-observation window 11; 12-adjustment port 12; 13-slideway 13; 2-temperature control base 2; 3-waveguide chip 3; 4-waveguide channel 4; 5-optical fiber jumper connector 5; 6-X direction adjusting frame 6; 61-X direction knob 61; 62-X direction return spring 62; 7-Y direction adjusting frame 7; 71-Y direction knob 71; 72-Y direction return spring 72; 8-Z direction adjusting frame 8; 81-Z direction knob 81; 82-Z direction return spring 82. DETAILED DESCRIPTION

[0022] In order to make the technical scheme, technical solutions and beneficial effects of the present application clearer, the technical scheme of the present application will be further described below in combination with the drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application, that is, the described embodiments are only a part of the embodiments of the present application, but not all the embodiments. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0023] The three-dimensional tunable coupling packaging structure based on a PPLN waveguide device according to the present application, as shown in Figures 1 to 3 , the packaging structure comprises a waveguide device 1 having an installation cavity inside, a waveguide chip 3 fixedly assembled in the installation cavity, and an optical fiber jumper connector 5 movably assembled in the installation cavity.

[0024] The waveguide device 1 is a rectangular block structure as a whole, and an installation cavity is formed inside. The waveguide chip 3 is fixed on one side of the installation cavity in the X direction, and the fiber jumper connector 5 is movably arranged on the other side of the installation cavity in the X direction. A temperature control base 2 is arranged on the right side of the bottom plate of the waveguide device 1, and the waveguide chip 3 is arranged on the temperature control base 2. The waveguide chip 3 is provided with a plurality of waveguide channels 4, each waveguide channel 4 corresponds to a different polarization period (also corresponds to a different matching wavelength). By designing the aperture width of the waveguide channel, different matching wavelengths can be achieved. According to the quasi-phase matching principle in nonlinear optics, the polarization period is proportional to the matching wavelength of the input light. The longer the matching wavelength, the greater the required polarization period. This method has wide application in the fields of microwave, optical fiber communication and integrated photonics, and will not be described in detail. Due to its unique manufacturing process, the waveguide chip 3 can have a plurality of waveguide transmission channels inside. Each waveguide transmission channel corresponds to a different polarization period and matches a different wavelength range. When a user inputs laser of different wavelengths, the three-dimensional adjustment frame can be adjusted to realize coupling with different transmission channels in the same waveguide chip 3. Compared with the two original ways in the existing scheme, the present application does not need to replace the waveguide and does not reduce the nonlinear conversion efficiency, and can realize wide-range matching wavelength adaptation.

[0025] Each waveguide channel 4 extends along the X direction and is arranged at intervals along the Y direction. Those skilled in the art can arbitrarily design the number and corresponding position arrangement of the waveguide channels 4 according to actual needs, and will not be described in detail.

[0026] In addition, a position adjusting mechanism for adjusting the position of the fiber jumper connector 5 is arranged in the installation cavity to make the axis of the fiber jumper connector 5 coaxially adapted to each waveguide channel 4 to realize coupling. The fiber jumper connector 5 is fixed on the position adjusting mechanism to follow the position adjusting mechanism to translate in the corresponding direction to achieve the positioning and adjustment of the corresponding matching coupling position.

[0027] The waveguide channel 4 extends along the X direction, and the corresponding position adjusting mechanism includes an X-direction adjusting frame 6, a Y-direction adjusting frame 7 and a Z-direction adjusting frame 8 stacked along the Z direction. The fiber jumper connector 5 is fixed on the Z-direction adjusting frame 8.

[0028] As one of the embodiments, for the X-direction adjusting frame 6, a slide 13 extending in the X direction is arranged in the installation cavity on the side of the input end of the waveguide channel 4. The X-direction adjusting frame 6 is movably assembled on the slide 13. The X-direction side of the waveguide device 1 is provided with an X-direction driving member for adjusting the X-direction position of the X-direction adjusting frame 6. The Y-direction adjusting frame 7 is movably assembled on the X-direction adjusting frame 6 in the Y direction, and the Z-direction adjusting frame 8 is movably assembled on the Y-direction adjusting frame 7 in the Z direction.

[0029] In order to realize three-way adjustment, the X-way adjusting frame 6 is connected with the waveguide device 1 and has an X-way reset spring 62 for applying a force to the X-way adjusting frame 6 to move back to the waveguide channel 4, and the X-way driving member is an X-way knob 61 which is screwed on the waveguide device 1 and is in abutting contact with the X-way adjusting frame 6; the Y-way adjusting frame 7 is top-mounted with a Y-way reset spring 72, and the side wall of the waveguide device 1 is provided with a Y-way knob 71; the Z-way adjusting frame 8 is top-mounted with a Z-way reset spring 82 between the Y-way adjusting frame 7, and the top wall of the waveguide device 1 is provided with a Z-way knob 81.

[0030] The X-way knob 61 is rotatably mounted on the X-way side plate of the waveguide device 1, and the end thereof is in abutting contact with the side wall of the X-way adjusting frame 6 along the X-way, the X-way reset spring 62 is connected between the waveguide device 1 and the X-way adjusting frame 6 along the X-way, the X-way reset spring 62 is two, is arranged in parallel along the Y-way in the interval between the two, and the bottom of the X-way adjusting frame 6 is movably mounted on the slide 13 of the waveguide device 1, and the X-way adjusting frame 6 is moved back and forth along the X-way by the cooperation of the screwing-in mode of the X-way knob 61 and the X-way reset spring, when the X-way knob 61 is screwed in, the X-way adjusting frame 6 is pushed by the X-way knob 61 to move towards the waveguide channel 4, and when the X-way knob is screwed out, the X-way adjusting frame 6 is pulled by the X-way reset spring 62 to move back to the waveguide channel 4.

[0031] The bottom of the Y-way adjusting frame 7 has an X-way extending through slot, the upper end surface of the X-way adjusting frame 6 has a protrusion, the Y-way knob 71 is rotatably mounted on the protrusion and the end thereof is in abutting contact with the side wall of the through slot of the Y-way adjusting frame 7, the protrusion and the Y-way adjusting frame 7 are respectively connected by two Y-way reset springs 72, and the Y-way adjusting frame 7 is movably mounted on the X-way adjusting frame 6 along the two sides of the X-way along the Y-way, and the Y-way adjusting frame 7 is moved back and forth along the Y-way by the cooperation of the Y-way knob 71 and the Y-way reset spring 72, that is, when the Y-way knob 71 is screwed in, the Y-way adjusting frame 7 is pushed by the Y-way knob 71 to move along the Y-way in the positive direction, and when the Y-way knob is screwed out, the Y-way adjusting frame 7 is pulled by the Y-way reset spring to move in the reverse direction.

[0032] The Z-way knob 81 is rotatably mounted on the Z-way adjusting frame 8, and the end of the Z-way knob 81 is in abutting contact with the top wall of the Y-way adjusting frame 7, the Y-way adjusting frame 7 and the Z-way adjusting frame 8 are respectively connected by four Z-way reset springs 82, and the two sides of the Z-way adjusting frame 8 are movably mounted on the two sides of the Y-way adjusting frame 7 along the Z-way, and the Z-way adjusting frame 8 is moved by the cooperation of the Z-way knob 81 and the Z-way reset spring 82, when the Z-way knob 81 is screwed in, the Z-way adjusting frame 8 is pushed by the Z-way knob 81 to move back to the Y-way adjusting frame 7; when the Z-way knob 81 is screwed out, the Z-way adjusting frame 8 is pulled by the Z-way reset spring 82 to move towards the Y-way adjusting frame 7.

[0033] In order to reasonably avoid the stroke range of the Y knob 71 and the Z knob 81 during the following movement, a suitable adjusting port 12 is arranged on the side wall and the top wall of the waveguide device 1 to adapt the insertion and the activity in the stroke range of the Y knob 71 and the Z knob 81, and the adjustment is formed in the redundant range, which can ensure that the adjustment of the other two dimensions does not affect the adjustment of the current dimension.

[0034] In addition, there is a gap between the bottom slide 13 of the waveguide device 1 and the waveguide channel 4. The fiber jumper joint 5 can be prevented from being accidentally touched with the waveguide channel 4 during the X adjustment, which can cause the cross-section damage.

[0035] A perspective window is arranged near the coupling end of the waveguide channel 4 on the waveguide device 1, which facilitates the observation of the coupling between the fiber jumper joint 5 and the waveguide channel 4 through a microscope.

[0036] When the user uses the waveguide device 1, the input light is input to the polarization maintaining fiber, a suitable waveguide channel 4 is found through the adjustment of the three knobs, the temperature of the temperature control base 2 is adjusted, and finally the high conversion efficiency of the output light corresponding to the matched wavelength is realized.

[0037] Finally, it should be noted that the above embodiments are only used for illustration and not for limiting the technical solutions of the present application, any equivalent replacement and modification or partial replacement of the present application without departing from the spirit and scope of the present application should be covered in the protection scope of the present application.

Claims

1. A three-dimensional tunable coupling package structure based on a PPLN waveguide device, characterized in that, Comprising A waveguide device with a mounting cavity inside, a waveguide chip fixedly assembled in the mounting cavity, and a fiber jumper connector movably assembled in the mounting cavity; The waveguide chip is provided with at least two waveguide channels, and each waveguide channel corresponds to a different polarization period; The mounting cavity is provided with a position adjusting mechanism for adjusting the position of the fiber jumper connector to make the axis of the fiber jumper connector coaxial with each waveguide channel to achieve coupling.

2. The three-dimensional tunable coupling package structure based on PPLN waveguide device according to claim 1, characterized in that, The waveguide channel extends along the X direction, and the position adjusting mechanism includes an X direction adjusting frame, a Y direction adjusting frame and a Z direction adjusting frame stacked along the Z direction, and the fiber jumper connector is fixed on the Z direction adjusting frame.

3. The three-dimensional tunable coupling package structure based on PPLN waveguide device of claim 2, wherein, The mounting cavity is provided with a slide extending along the X direction on the side of the input end of the waveguide channel, the X direction adjusting frame is movably assembled on the slide, and the X direction side of the waveguide device is provided with an X direction driving member for adjusting the X direction position of the X direction adjusting frame.

4. The three-dimensional tunable coupling package structure based on PPLN waveguide device of claim 3, wherein, The Y direction adjusting frame is movably assembled on the X direction adjusting frame along the Y direction, and the Z direction adjusting frame is movably assembled on the Y direction adjusting frame along the Z direction.

5. The three-dimensional tunable coupling package structure based on PPLN waveguide device of claim 4, wherein, The X direction adjusting frame and the waveguide device are connected with an X direction reset spring applying an action force to the X direction adjusting frame moving away from the waveguide channel, the X direction driving member is an X direction knob screwed on the waveguide device and in abutting contact with the X direction adjusting frame, the Y direction adjusting frame and the X direction adjusting frame are provided with a Y direction reset spring, and the sidewall of the waveguide device is provided with a Y direction knob, the Z direction adjusting frame and the Y direction adjusting frame are provided with a Z direction spring, and the top wall of the waveguide device is provided with a Z direction knob.

6. The three-dimensional tunable coupling package structure based on PPLN waveguide device of claim 3, wherein, The slide and the waveguide channel have a gap therebetween.

7. The three-dimensional tunable coupling package structure based on PPLN waveguide device of claim 2, wherein, The coupling end of the waveguide channel on the waveguide device is provided with a perspective window.

8. The three-dimensional tunable coupling package structure based on PPLN waveguide device of claim 1, wherein, The bottom of the waveguide chip is provided with a temperature control base.

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