Tube core structure and TOSA device thereof

Abstract

The utility model relates to the technical field of optical communication devices, in particular to a tube core structure and a TOSA device thereof. The tube core structure comprises a core body, one end portion of the core body inclines inwards and contracts inwards to form an installation opening, and the other end portion of the core body sinks inwards to the installation opening to form a limiting cavity. The convergent lens is accommodated in the mounting opening, and the convergent lens is arranged in the mounting opening; the optical signal transmitter is arranged in the limiting cavity, and the optical signal transmitter is arranged in the limiting cavity; the optical signal transmitter comprises a substrate, a laser and an optical isolator, the laser and the optical isolator are arranged on the substrate, and signal light generated by the laser passes through the optical isolator and then enters the convergent lens; the optical isolator is constructed based on an optical isolation function of a 1 / 4 wave plate. By means of the structure, the optical system at least has the advantages of being low in cost, small in size, small in clear aperture and the like.

Description

TECHNICAL FIELD

[0001] The utility model relates to optical communication device technical field, concretely relates to a tube core structure and its TOSA device. BACKGROUND

[0002] TOSA module (Transmitter Optical Subassembly, optical transmitter subassembly) is a kind of photoelectric conversion module, mainly for converting electrical signal into optical signal (E / O conversion).TOSA module generally includes LD chip, lens and optical isolator, wherein LD chip is used to change electrical signal into optical signal, then emit the signal light after modulation, signal light is focused after passing through lens and enters optical isolator, and optical isolator is used to avoid the reflection light to enter LD chip, finally signal light enters optical fiber propagation after passing through optical isolator.

[0003] Optical isolator in prior art refers to the device based on Faraday optical rotation effect, and the device has high cost, thereby making the packaging cost of TOSA module rise.In addition, the optical isolator needs larger light aperture, thereby causing restriction to the volume of TOSA module, so that the volume of TOSA device cannot be made smaller.At the same time, the larger light aperture will also make the volume of adapter and lens increase, so that the focusing property of signal light is not enough, and the precision of optical transmission and recovery cost are restricted. UTILITY MODEL CONTENT

[0004] The utility model provides a tube core structure and its TOSA device in view of the defects, such as high cost of optical isolator in prior art and restriction to light aperture based on Faraday optical rotation principle, at least has the advantages, such as low cost, small volume and small light aperture.

[0005] First aspect

[0006] The utility model provides a tube core structure, it includes:

[0007] Core body, the one end of core body is inwards and inclines to draw in and forms installation port, and the other end is sunken to the installation port inwards and forms limiting cavity;

[0008] Converging lens, the converging lens is accommodated in the installation port;

[0009] Optical signal emitter, the optical signal emitter is arranged in the limiting cavity;

[0010] The optical signal emitter includes substrate, and laser and optical isolator arranged on the substrate, and the signal light generated by the laser is injected into the converging lens after passing through optical isolator;

[0011] The optical isolator is based on a 1 / 4 wave plate.

[0012] Specifically, one of main ideas of the utility model is that the 1 / 4 wave plate-based optical isolator is arranged between the laser and the converging lens to replace the optical isolator arranged behind the converging lens, thereby reducing the manufacturing cost of the TOSA device, and the 1 / 4 wave plate-based optical isolator can be arranged on the laser, so that the light transmission aperture of the optical fiber can be determined based on the emission aperture of the signal light of the laser, and the technical effect of reducing the light transmission aperture is achieved.

[0013] Further, the laser and the converging lens are coaxially arranged.

[0014] The optical isolator comprises a polarization beam splitter and a 1 / 4 wave plate.

[0015] The polarization beam splitter is arranged between the laser and the 1 / 4 wave plate.

[0016] Specifically, one of packaging modes of the TOSA device is that the laser and the converging lens are coaxially arranged, i.e., the signal light emitted by the laser is directly incident into the converging lens and then transmitted into the optical fiber.

[0017] Further, the 1 / 4 wave plate is integrated into the polarization beam splitter through a coating process.

[0018] Optionally, the 1 / 4 wave plate is attached to the polarization beam splitter through a pasting process.

[0019] Optionally, the optical isolator is attached to the laser.

[0020] In some embodiments, the laser is parallel to the substrate.

[0021] The optical isolator comprises a polarization beam splitter, a mirror and a 1 / 4 wave plate.

[0022] The mirror is used to change the propagation path of the signal light, so that the signal light sequentially passes through the polarization beam splitter, the mirror and the 1 / 4 wave plate.

[0023] Specifically, another packaging mode of the TOSA device is that the laser and the converging lens are not coaxial, at this time, the laser changes the propagation path of the signal light through the mirror, and the signal light first exits the laser, and then changes the propagation path of the light path through the mirror, and then enters the converging lens. Therefore, in the embodiment of the laser and the converging lens, the optical isolator includes a polarization beam splitter, a mirror and a 1 / 4 wave plate.

[0024] Further, the polarization beam splitter is integrated in the mirror by coating;

[0025] Or, the 1 / 4 wave plate is integrated in the mirror by coating;

[0026] Or, the polarization beam splitter and the 1 / 4 wave plate are integrated in the mirror by coating.

[0027] Optionally, the polarization beam splitter is integrated in the mirror by coating;

[0028] Or, the 1 / 4 wave plate is integrated in the mirror by coating;

[0029] Or, the polarization beam splitter and the 1 / 4 wave plate are integrated in the mirror by coating.

[0030] Optionally, the polarization beam splitter and the 1 / 4 wave plate can also be used by mixing the coating process and the coating process.

[0031] Further, the optical signal transmitter includes a collimating lens, and the collimating lens is arranged between the laser and the optical isolator.

[0032] Further, the optical signal transmitter includes a semiconductor cooler for regulating the temperature of the substrate.

[0033] Optionally, the application scenario of the die structure is 25GLWDM.

[0034] The second aspect

[0035] The utility model provides a kind of TOSA device, including the die structure provided by any one of the first aspect, comprising:

[0036] Pipe seat, the pipe seat is set to the direction of the limiting cavity, for the core body is fixed and limited;

[0037] Adjusting ring, the adjusting ring is set by its one end portion the core body, and its other end portion provides accommodating cavity;

[0038] An adapter at least partially housed in the housing cavity.

[0039] Specifically, based on the first aspect, the die structure makes the 1 / 4 wave plate-based optical isolator be arranged between the laser and the converging lens, so that the optical isolator between the adjusting ring and the adapter is omitted, thereby reducing the volume of the TOSA device.

[0040] Further, the adapter comprises a fiber hole, and a hole diameter of the fiber hole is adapted to an emission hole diameter of the laser.

[0041] In summary, the die structure and the TOSA device have at least the following advantages:

[0042] 1. The die structure replaces the optical isolator arranged behind the converging lens with the 1 / 4 wave plate-based optical isolator, and arranges the 1 / 4 wave plate-based optical isolator between the laser and the converging lens, thereby reducing the manufacturing cost of the TOSA device, and the 1 / 4 wave plate-based optical isolator can be arranged close to the laser, so that the light transmission hole diameter of the optical fiber can be determined based on the emission hole diameter of the signal light of the laser, thereby reducing the light transmission hole diameter.

[0043] 2. The die structure can be applied to the coaxial arrangement of the laser and the converging lens, and can also be applied to the non-coaxial arrangement of the laser and the converging lens, and only the composition of the optical isolator needs to be designed differently.

[0044] 3. The optical isolator mainly comprises a polarization beam splitter and a 1 / 4 wave plate, and can be integrated by coating or adhesive, so that the optical isolator device can be directly used close to the laser, and the light transmission hole diameter of the TOSA device is only limited by the emission hole diameter of the laser, and is irrelevant to the optical isolator between the core and the adapter, thereby making the light emission of the TOSA device have better focusing property. BRIEF DESCRIPTION OF DRAWINGS

[0045] The utility model will be further described in detail below in combination with the drawings and preferred embodiments, but the skilled in the art will appreciate that these drawings are only drawn for the purpose of explaining the preferred embodiments and therefore should not be regarded as limiting the scope of the utility model. In addition, unless specifically indicated, the drawings only schematically show the composition or structure of the described object and can contain exaggerated display, and the drawings are not necessarily drawn to scale.

[0046] Figure 1 The utility model embodiment provides the structure schematic drawing of tube core structure;

[0047] Figure 2 The utility model embodiment provides the structure schematic drawing of tube core structure in two application scenarios;

[0048] Figure 3 The utility model embodiment provides the composition schematic drawing of TOSA device based on tube core structure;

[0049] Figure 4 The difference diagram of the embodiment and the comparative example provided by the utility model;

[0050] 10, core body;20, converging lens;30, optical signal transmitter;40, pipe seat;50, tube core cover;60, adjusting ring;70, adapter;101, installation mouth;102, limiting cavity;301, base plate;302, laser;303, optical isolator;601, containing cavity;701, optical fiber hole;3031, polarization beam splitter;3032, 1 / 4 wave plate;3033, reflecting mirror. DETAILED DESCRIPTION

[0051] The utility model will be further described in detail below in combination with the drawings and preferred embodiments, but the skilled in the art will appreciate that these drawings are only drawn for the purpose of explaining the preferred embodiments and therefore should not be regarded as limiting the scope of the utility model. In addition, unless specifically indicated, the drawings only schematically show the composition or structure of the described object and can contain exaggerated display, and the drawings are not necessarily drawn to scale. Figures 1 to 4 The utility model is described in detail.

[0052] In order to make the purpose, technical scheme and advantages of the utility model more clear and obvious, the utility model is further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and not used to limit the utility model.

[0053] The main idea of the utility model is that the optical isolator 303 between the converging lens 20 and the adapter 70 of the TOSA device in the prior art is replaced by the optical isolator 303 principle of the 1 / 4 wave plate 3032, so as to achieve the purpose of reducing the TOSA device aperture, reducing the device volume and reducing the TOSA device manufacturing cost.

[0054] Please see Figure 1 The structure schematic drawing of tube core structure provided by the utility model embodiment is shown.

[0055] Specifically, since the TOSA has various packaging modes, such as TO-CAN process or BOX process or TLN process and the like, the minimum unit of the concept, the die structure, is protected to adapt to more process scenarios. The die structure comprises a core body 10, the core body 10 is usually manufactured as a device with two open ends, one end of the core body 10 comprises a mounting port 101, the mounting port 101 is used for accommodating a converging lens 20, the converging lens 20 is used for focusing when signal light enters light rays, and the other end of the core body 10 is used for arranging an optical signal transmitter 30. The optical signal transmitter 30 is used for electric-optical conversion and emits signal light carrying signals. The optical signal transmitter 30 at least comprises a substrate 301, a laser 302 and an optical isolator 303, and the laser 302 and the optical isolator 303 are arranged on the substrate 301. It is worth understanding that the optical isolator 303 provided by the embodiment is not an optical isolator 303 based on Faraday optical rotation effect in practical sense, but an alternative technical solution of the optical isolator 303, which adopts the optical isolation principle of a 1 / 4 wave plate 3032. Since the 1 / 4 wave plate 3032 is only a small lens structure, it can be completely placed in the limiting cavity 102 of the core body 10, thereby omitting the optical isolator 303 based on Faraday optical rotation effect between the converging lens 20 and the adapter 70 in the prior art, and further eliminating the limitation of the optical isolator 303 based on Faraday optical rotation effect on the size of the light aperture, and only depending on the emission aperture of the laser 302. In theory, the smaller the lens, the smaller the light aperture.

[0056] Optionally, the chip size of the laser 302 can be selected as 0.25mm*0.1mm at present, thereby being reduced by more than 50% compared with the ∮0.3mm of the optical isolator 303 based on Faraday optical rotation effect at present.

[0057] Meanwhile, the omission of the optical isolator 303 based on Faraday optical rotation effect can also reduce the volume of the whole TOSA device by at least 10%-20%. In addition, the optical isolator 303 based on Faraday optical rotation effect has a high cost, and the overall manufacturing cost of the TOSA device can also be reduced.

[0058] Since the placement mode of the laser 302 in the existing process includes two kinds, one is that the laser 302 is coaxially placed with the converging lens 20, and the other is that the laser 302 is non-coaxially placed with the converging lens 20, the utility model provides at least two layout modes of the laser 302, please refer to Figure 2 Fig. 2 shows a structure schematic diagram of the die structure in the two application scenarios provided by the embodiment of the utility model.

[0059] Specifically, Figure 2(A) is the laser 302 and the converging lens 20 coaxial placement, at this time the laser 302 embedded in the base plate 301 set, while the optical isolator 303 with a polarizing beam splitter 3031 and 1 / 4 wave plate 3032 group, and paste with the base plate 301 set, just cover the laser 302 of the exit, with the laser 302 coaxial.

[0060] Optionally, 1 / 4 wave plate 3032 coated film process to the polarizing beam splitter 3031.

[0061] Optionally, the polarizing beam splitter 3031 coated film process to the 1 / 4 wave plate 3032.

[0062] Optionally, 1 / 4 wave plate 3032 and polarizing beam splitter 3031 using a split way to manufacture, both by adhesive.

[0063] In another alternative embodiment, please see Figure 2 (B) is the laser 302 and the converging lens 20 non coaxial placement. At this time, a mirror 3033 is needed to change the light path of the laser 302 signal light path.

[0064] Optionally, 1 / 4 wave plate 3032 coated film process to the mirror 3033.

[0065] Optionally, the polarizing beam splitter 3031 coated film process to the mirror 3033.

[0066] Optionally, 1 / 4 wave plate 3032 and polarizing beam splitter 3031 using a coated film process to the mirror 3033.

[0067] Optionally, 1 / 4 wave plate 3032 using a glue process to the mirror 3033.

[0068] Optionally, the polarizing beam splitter 3031 using a glue process to the mirror 3033.

[0069] Optionally, 1 / 4 wave plate 3032 and polarizing beam splitter 3031 using a glue process to the mirror 3033.

[0070] Optionally, the coating process and glue process can be combined, such as 1 / 4 wave plate 3032 coated film process, polarizing beam splitter 3031 using a glue process, or 1 / 4 wave plate 3032 using a glue process, polarizing beam splitter 3031 using a coated film process.

[0071] The choice of the above process, depending on the process difficulty and process manufacturing cost.

[0072] It is worth understanding that, in order to realize the integration of the mirror 3033, the 1 / 4 wave plate 3032 and the polarization beam splitter 3031 as the light reflector and the optical isolator 303. The mirror 3033 is configured as a right trapezoidal structure, and the emission film is coated on the hypotenuse of the mirror body inside, so that the path of the signal light is changed, and the polarization beam splitter 3031 is arranged between the hypotenuse and the laser 302, and the 1 / 4 wave plate 3032 is arranged between the hypotenuse and the converging lens 20, so that the integration of the optical isolation and the optical reflection functions is realized.

[0073] Optionally, the mirror 3033 of the mirror 3033 is selected according to the included angle required to be refracted between the laser 302 and the converging lens 20, so that the application scene of 0-180° full included angle can be applied.

[0074] Optionally, the optical signal transmitter 30 comprises a collimating lens, and the collimating lens is arranged between the laser 302 and the optical isolator 303.

[0075] Optionally, the optical signal transmitter 30 comprises a semiconductor refrigerator for regulating the temperature of the substrate 301.

[0076] Optionally, the application scene of the die structure is 25GLWDM.

[0077] The utility model provides a kind of TOSA device based on the above die structure, please refer to Figure 3 As the component schematic diagram of TOSA device based on die structure provided by the utility model embodiment.

[0078] Specifically, the TOSA device provided by the utility model comprises a tube seat 40, the tube seat 40 is arranged relative to the direction of the limiting cavity 102, for the core body 10 to be fixed and limited;Adjusting ring 60, the adjusting ring 60 is sleeved with the core body 10 by one end thereof, and the other end thereof provides a containing cavity 601;Adapter 70, the adapter 70 is at least partially contained in the containing cavity 601.

[0079] Among them, the core body 10 is also sleeved by die sleeve 50.

[0080] And the middle part of the adapter 70 is a fiber hole 701 for placing optical fiber.

[0081] It can be understood that, Figure 3 The TOSA device composed of laser 302 arranged in non-coaxial mode, the TOSA device composed of laser 302 arranged in coaxial mode can refer to Figure 2 (A).

[0082] Further, please refer to Figure 4The diagram shows the differences between the embodiments and comparative examples provided by this utility model.

[0083] Specifically, taking the TOSA device composed of lasers 302 arranged in a non-coaxial manner as an example, existing technologies such as Figure 4 As shown in (D), the optical isolator 303 is located between the adapter 70 and the converging lens 20. The optical isolator 303 is based on the Faraday rotation effect. The aperture of the fiber optic port 701 in this type of TOSA device is limited by the size of the optical isolator 303. The TOSA assembly provided by this invention (… Figure 4 In (C), the optical isolator 303 is replaced by the optical isolation function of the quarter-wave plate 3032, thereby eliminating the need for the optical isolator 303 between the adapter 70 and the converging lens 20. Instead, a lens assembly such as the quarter-wave plate 3032 is used, which makes the light-transmitting aperture of the fiber optic hole 701 only limited by the light-emitting aperture of the laser 302. This allows the light-transmitting aperture of the TOSA device of this invention to be smaller and the cost to be lower.

[0084] The present invention has been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only for the purpose of helping to understand the present invention and its core ideas. It should be noted that for those skilled in the art, several improvements and modifications can be made to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A core structure, characterized in that, include: The core (10) has one end that is inclined inward to form an installation port (101), and the other end that is sunk inward to the installation port (101) to form a limiting cavity (102). A converging lens (20) is housed in the mounting port (101); An optical signal transmitter (30) is disposed in the limiting cavity (102); The optical signal transmitter (30) includes a substrate (301), a laser (302) and an optical isolator (303) disposed on the substrate (301). The signal light generated by the laser (302) passes through the optical isolator (303) and then enters the converging lens (20). The optical isolator (303) is constructed based on the optical isolation function of a quarter-wave plate (3032).

2. The core structure as described in claim 1, characterized in that, The laser (302) is coaxially arranged with the converging lens (20); The optical isolator (303) includes a polarization beam splitter (3031) and a quarter-wave plate (3032); The polarization beam splitter (3031) is disposed between the laser (302) and the quarter-wave plate (3032).

3. A core structure as described in claim 2, characterized in that, The quarter-wave plate (3032) is integrated into the polarization beam splitter (3031) by a coating process.

4. A core structure as described in claim 1, characterized in that, The laser (302) is parallel to the substrate (301); The optical isolator (303) includes a polarizing beam splitter (3031), a mirror (3033), and a quarter-wave plate (3032); The reflector (3033) is used to change the propagation path of the signal light, so that the signal light passes through the polarization beam splitter (3031), the reflector (3033), and the quarter wave plate (3032) in sequence.

5. A core structure as described in claim 4, characterized in that, The polarization beam splitter (3031) is integrated into the reflector (3033) by means of coating; Alternatively, the quarter-wave plate (3032) may be integrated into the reflector (3033) by means of a coating. Alternatively, the polarizing beam splitter (3031) and the quarter-wave plate (3032) are both integrated into the reflector (3033) by means of coating.

6. A core structure as described in any one of claims 1-5, characterized in that, The optical signal transmitter (30) includes a collimating lens, which is disposed between the laser (302) and the optical isolator (303).

7. A core structure as described in claim 6, characterized in that, The optical signal transmitter (30) includes a semiconductor cooler for regulating the temperature of the substrate (301).

8. A core structure as described in claim 6, characterized in that, The application scenario for the described core structure is 25GLWDM.

9. A TOSA device, comprising a die structure as described in any one of claims 1-8, characterized in that, include: Tube seat (40), the tube seat (40) is arranged in a direction relative to the limiting cavity (102) for fixing and limiting the core (10); An adjusting ring (60) is fitted with the core (10) at one end and provides a receiving cavity (601) at the other end. An adapter (70) is at least partially housed in the receiving cavity (601).

10. A TOSA device as described in claim 9, characterized in that, The adapter (70) includes an optical fiber port (701) whose aperture is adapted to the emission aperture of the laser (302).

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