CN219285463U - Single-fiber bidirectional optical transceiver component applied to XGSPON - Google Patents

Abstract

The utility model is applied to a single-fiber bidirectional optical transceiver component of an XGSPON, a laser and an isolator are arranged in an isolator support, and the isolator support is arranged at a transmitting end of a square seat; the utility model adopts the aspheric tube cap with the outer focal length of 7.5mm, which not only has advantages in material cost, but also has better consistency of focal length after LD encapsulation, thereby being beneficial to batch production; the optical transceiver component requires fiber output power greater than 2.6mW, a ceramic ferrule inclined at an angle of 8 degrees is arranged on the tail core, and the deflection angle between the central axis of the ceramic ferrule and the central axis of the tail fiber ladle needle is 3.78.

Description

Single-fiber bidirectional optical transceiver component applied to XGSPON

Technical Field

The utility model relates to the field of clothing optical communication, in particular to a single-fiber bidirectional transceiver.

Background

bosa is an important component in the field of optical communications. For example, in the structures of chinese patent CN 202512275U and CN208207286U,10G single-fiber bidirectional transceiver component, the focus is wdm beam splitting/filtering at the center, and the laser ld component and pd component are coupled with the optical fiber through self-focusing lenses. The working principle is shown in figure 1, the ld component emits light with the wavelength of 1270nm, the light is focused into parallel light beams through the self-focusing lens, the parallel light beams are coupled into the transmission optical fiber through the 45-degree filter, the transmission optical fiber is used for transmitting the light, the other external signal light with the wavelength of 1577nm is transmitted in through the optical fiber, reflected through 45-degree wdm, irradiated onto the self-focusing lens on the pd component through the 0-degree filter, and the light beams are coupled with the detector component through the lens light focusing and are received by the receiver.

The existing XGSPON single-fiber bidirectional optical transceiver component has high fiber output power (the fiber output power is larger than 2.6 mW), and for the traditional scheme of the pipe cap of the DFB LD, an aspheric pipe cap with an outer focal length of 10.1mm is adopted, so that the material cost of the pipe cap is relatively high, and the consistency of focal length is relatively poor after the LD is packaged, thus being not beneficial to batch production; the tail fiber traditional scheme adopts a common inclined 8-degree ceramic ferrule, and the optical power coupling efficiency is common; the 10Gbps APD-TIA TO-CAN traditional scheme generally adopts a non-spherical tube cap TO realize light convergence, and the cost is relatively high.

Disclosure of Invention

The utility model aims to provide an XGSPON single-fiber bidirectional optical transceiver component which is low in cost and easy to package and has fiber output power larger than 2.6 mW.

In order TO achieve the aim, the single-fiber bidirectional optical transceiver component applied TO the XGSPON mainly comprises a laser, a PD, a 0-degree wave plate, a 45-degree wave plate, an isolator, an adjusting ring, a tail fiber and the like, wherein the laser and the isolator are arranged in an isolator support, the isolator support is arranged at the transmitting end of a square seat, the square seat is internally provided with the 45-degree wave plate, the 0-degree wave plate is arranged right above the 45-degree wave plate, and an APD-TIA TO-CAN is arranged above the 0-degree wave plate; the laser mainly comprises a 10Gbps 1270nm DFB laser chip, an MPD chip, a tube seat, a tube cap with an out-of-band focal length 7.5mm aspheric lens, a ceramic wafer, a heat sink, gold wires and silver colloid; the APD-TIA TO-CAN mainly comprises a 10G APD chip, a TIA chip, a capacitor, a ceramic wafer, a tube seat, a tube cap with a water drop ball lens or a high-refraction lens, gold wires and silver colloid; the end part of the tail fiber is provided with a ceramic ferrule with an inclined plane of 8 degrees, and the deflection angle between the central axis of the ceramic ferrule and the central axis of the tail fiber ladle needle is 3.78 degrees.

The utility model adopts the aspheric tube cap with the outer focal length of 7.5mm, which not only has advantages in material cost, but also has better consistency of focal length after LD encapsulation, thereby being beneficial to batch production; the optical transceiver component has the advantages that the fiber output power required by the optical transceiver component is high (the fiber output power is larger than 2.6 mW), the ceramic ferrule inclined at an angle of 8 degrees is arranged on the tail core, the deflection angle between the central axis of the ceramic ferrule and the central axis of the tail fiber ladle needle is 3.78, and the BOSA can realize larger coupling power through the optical design.

Drawings

FIG. 1 is a schematic diagram of a conventional single-fiber bi-directional optical transceiver;

FIG. 2 is a schematic diagram of the structure of the present utility model;

FIG. 3 is a schematic illustration of a ferrule configuration of the present utility model;

FIG. 4 is a schematic view of the optical path of a laser incident on a ferrule according to the present utility model;

FIG. 5 is a schematic view of the light path of the present utility model.

Description of the reference numerals:

1. a laser; 2. APD-TIA TO-CAN; 3. a square seat; 4. an isolator; 41. an isolator mount; 5. a 0 degree wave plate; 6. a 45 degree wave plate; 7. an adjusting ring; 8. tail fiber; 81. a ceramic ferrule; 9. a flexible circuit board.

Detailed Description

In order to describe the technical content, the constructional features, the achieved objects and effects of the present utility model in detail, the following description is made in connection with the embodiments and the accompanying drawings.

Referring TO fig. 2, the single-fiber bidirectional optical transceiver module applied TO XGSPON of the present utility model mainly comprises a laser 1, an APD-TIA TO-CAN2, a tetragonal base 3, an isolator 4, an isolator support 41, a 0-degree wave plate 5, a 45-degree wave plate 6, an adjusting ring 7, a tail fiber 8, a flexible circuit board 9, glue, and the like.

The laser 1 mainly comprises a 10Gbps 1270nm DFB laser chip, an MPD chip, a tube seat, a tube cap with an aspheric lens (with an outer focal length of 7.5 mm), a ceramic wafer, a heat sink, gold wires, silver colloid and the like;

the APD-TIA TO-CAN2 mainly comprises a 10G APD chip, a TIA chip, a capacitor, a ceramic wafer, a tube seat, a tube cap with a water-drop ball lens (or a high-refraction lens), gold wires, silver colloid and the like;

as shown in FIG. 2, the 0-degree wave plate 5 and the 45-degree wave plate 6 are arranged at the corresponding positions of the square seat, and the wave plate and the square seat are connected together after being solidified by 353ND or BF-4 glue. The isolator mount 41 is welded to the laser 1 using a resistance welding process. The separator 4 is mounted on the separator support 41 and the 353ND glue or BF-4 glue is fixed together after curing. After the laser 1, the isolator support 41 and the isolator 4 are assembled together, the laser 1, the isolator support 41 and the isolator 4 are pressed into the corresponding structure of the square seat 3 in a pressing mode, and the connection between the laser 1 and the isolator support 4 is reinforced by laser penetration welding on the cylindrical surface of the square seat in pressing fit. The adjusting ring 7 and the tail fiber 8 are fixed together by laser penetration welding, and the adjusting ring 7 and the square seat 3 are fixed together by laser lap welding. The APD-TIA TO-CAN2 is fixed together by 353ND glue or BF-4 glue after solidification. After the pins of the laser 1 are cut short, the flexible circuit board 9 and the laser 1 are assembled and soldered together.

As shown in fig. 3-5, one end of the ferrule 81 is provided with an inclined surface inclined by 8 degrees; a deflection angle of 3.78 degrees is arranged between the central axis of the ceramic ferrule 81 and the central axis of the ladle needle of the tail fiber 8, and the total inclination angle of the end face of the tail fiber 8 added by the two is 11.78 degrees; as can be seen from the optical path of fig. 4, when the light from the laser 1 reaches the end face of 11.78 degrees, the reflection angle is equal to the incident angle according to the reflection principle of the light, the reflected light will be reflected out in the side direction, and the reflected light will not return to the inside of the chip of the laser 1 to affect the normal light emission of the laser, thus achieving the effect similar to that of the conventional isolator (the effect of the conventional isolator is to prevent the reflected light on the optical path from returning to the inside of the laser), and thus, the performance and the use of the product are not affected under the condition without the isolator. When the laser 1 is emitted from the end face of the ferrule 81, the center line of the optical path forms a deflection angle of 3.78 degrees with the horizontal line (which can be calculated according to the refraction principle of light, in fig. 5, n=n '×sina', where n=1.4676, a=8°, n '=1, the refraction angle a' =11.78°, and finally the included angle between the optical path and the horizontal line can be calculated to be 3.78 °). According to the characteristic of reversibility of the optical path, when the laser light of the laser is to be coupled into the tail fiber, the deflection angle also exists, and is analyzed from the structure and the production process of the single-fiber bidirectional optical transceiver component, and the deflection angle has adverse effect on the optical power coupling efficiency of the single-fiber bidirectional optical transceiver component.

In order to improve the optical power coupling efficiency of the single-fiber bidirectional optical transceiver component, a deflection angle of 3.78 degrees is specially designed between the central axis of the ceramic ferrule and the central axis of the fiber pigtail ladle needle on the fiber pigtail, so that when laser comes out from the end face of the ferrule, the central line of an optical path is in a horizontal line state (see fig. 4) and cannot deflect upwards by 3.78 degrees. According to the characteristic of reversibility of the optical path, when the laser of the laser is to be coupled into the tail fiber, the laser enters the end face of the inclined ceramic ferrule along the horizontal direction of the optical path, and the analysis of the structure and the production process of the single-fiber bidirectional optical transceiver component proves that the optical path along the horizontal direction is beneficial to improving the optical power coupling efficiency of the single-fiber bidirectional optical transceiver component, thereby having the opportunity to replace a non-spherical tube cap by a tube cap with a high-refraction lens.

The utility model replaces the non-spherical tube cap with the water drop ball lens or the high-refraction lens, and the principle is as follows:

1) When the non-spherical pipe cap is adopted, the diameter of a light spot of the light component receiving end falling on the surface of the photoelectric detector chip is about 7 microns through optical calculation and analysis; the diameter of the photosensitive surface of the photoelectric detector chip is 40 micrometers, and the diameter of the light spot is much smaller than that of the photosensitive surface, so that the production allowance is large;

2) When the pipe cap with the water drop ball lens or the high-refraction lens is adopted, the diameter of a light spot of the light component receiving end falling on the surface of the photoelectric detector chip is about 27 microns through optical calculation and analysis; the diameter of the photosensitive surface of the photoelectric detector chip is 40 micrometers, and the diameter of the light spot is still smaller than that of the photosensitive surface, so that a tube cap scheme with a water drop ball lens or a high-refraction lens is also feasible, and the tube cap scheme can replace a non-spherical tube cap, and only the production allowance is not as large as that of the non-spherical tube cap.

Referring to the structure diagram of the product, the single-fiber bidirectional optical transceiver component consists of two optical paths: the first path of light path is laser emitted by a 10Gbps 1270nm laser 1 chip, passes through an aspheric lens on a pipe cap, passes through an isolator 4, then passes through a 45-degree wave plate 6, and is converged on a ceramic ferrule 81 with inclination on a tail fiber 8, enters an optical fiber of the tail fiber 8, and is transmitted out through the optical fiber. The second path of light path is 1577nm wavelength laser transmitted from outside optical fiber, and is transmitted TO optical fiber of tail fiber 8 through tail fiber head of tail fiber SC, laser is transmitted into the optical component through inclined ceramic ferrule 81, after laser is reflected by 45 degree wave plate 6, 1577nm wavelength laser propagation direction is turned into 90 degree direction, after being filtered by 0 degree wave plate 5, laser is converged on photosensitive surface of APD chip after passing through water drop ball lens (or high-refraction lens) cap of APD-TIA TO-CAN2, APD chip converts laser into current, photoelectric conversion is realized, and TIA of APD-TIA2 further amplifies current signal, and electric signal is transmitted through pipe seat pin.

The transmitting end is realized by 10Gbps 1270nm DFB laser, the receiving end is realized by 10Gbps APD-TIA TO-CAN TO realize 1577nm wavelength light receiving, the transmitting end and the receiving end are realized by one optical component, and according TO the analysis of the optical path, the transmitting of 10Gbps 1270nm wavelength laser and the receiving of 10Gbps 1577nm wavelength light receiving are realized on one optical fiber TO realize single-fiber bidirectional transmission.

The method is characterized in that: the optical transceiver component has high fiber output power (the fiber output power is larger than 2.6 mW), and the traditional scheme of the pipe cap of the DFB LD adopts an aspheric pipe cap with the outer focal length of 10.1mm, so that the material cost of the pipe cap is relatively high, and the consistency of the focal length is relatively poor after the LD is packaged, thereby being unfavorable for mass production. The scheme adopts the aspheric cap with the outer focal length of 7.5mm to replace the aspheric cap with the outer focal length of 10.1mm, so that the material cost is advantageous, and the consistency of focal length is relatively good after LD packaging, thereby being beneficial to batch production.

And the second characteristic is that: the optical transceiver component has high fiber output power (the fiber output power is more than 2.6 mW), the tail fiber adopts a common inclined 8-degree ceramic ferrule in the traditional scheme, and the optical power coupling efficiency is general. The scheme makes special optical design on the inserting core with the inclination, and can enable the BOSA to achieve larger coupling power.

And the third characteristic is: in the past traditional scheme of 10Gbps APD-TIA TO-CAN, the light convergence is generally realized by adopting a non-spherical tube cap, the cost is relatively high, and in the scheme, the light convergence is realized by adopting the tube cap with a water drop ball lens or a high-refraction lens, and the cost is relatively high.

The foregoing description is only illustrative of the present utility model and is not intended to limit the scope of the utility model, and all equivalent structures or equivalent processes or direct or indirect application in other related technical fields are included in the scope of the present utility model.

Claims (1)

1. A single-fiber bidirectional optical transceiver module applied to XGSPON mainly comprises a laser, a PD, a 0-degree wave plate, a 45-degree wave plate, an isolator, an adjusting ring and a tail fiber, and is characterized in that: the laser and the isolator are arranged in an isolator support, the isolator support is arranged at the transmitting end of a square seat, a 45-degree wave plate is arranged in the square seat, a 0-degree wave plate is arranged right above the 45-degree wave plate, and an APD-TIATO-CAN is arranged above the 0-degree wave plate; the laser mainly comprises a 10Gbps 1270nm DFB laser chip, an MPD chip, a tube seat, a tube cap with an out-of-band focal length 7.5mm aspheric lens, a ceramic wafer, a heat sink, gold wires and silver colloid; the APD-TIATO-CAN mainly comprises a 10GAPD chip, a TIA chip, a capacitor, a ceramic plate, a tube seat, a tube cap with a water drop ball lens or a high-refraction lens, gold wires and silver colloid; the end part of the tail fiber is provided with a ceramic ferrule with an inclined plane of 8 degrees, and the deflection angle between the central axis of the ceramic ferrule and the central axis of the tail fiber ladle needle is 3.78 degrees.

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