CN211603625U - Small-sized integrated optical assembly for high-speed BOSA device - Google Patents

Abstract

The utility model discloses a small integrated optical assembly for a high-speed BOSA device, which comprises a polarizing film, a first optical filter, a half-wave plate, a Faraday rotator and a polarization light splitter which are sequentially attached; a quarter-wave plate and a reflector are sequentially attached to one side surface of the polarization light splitter, which is adjacent to the Faraday rotation plate; and a second optical filter is also attached to the other side surface of the polarization light splitter, which is adjacent to the Faraday rotator. The scheme integrates the functions of the isolator, the light splitting sheet, the polarization light splitting and the light combining into a whole, achieves small integration, and greatly saves material cost and light path adjustment difficulty; in addition, the scheme also has the advantages of easiness in processing and volume production, low cost, excellent performance, high reliability and the like, and main performance indexes such as isolation, differential loss and the like of the scheme completely meet the corresponding high-standard requirements in the industry, so that the scheme has a wide market commercial prospect.

Description

Small-sized integrated optical assembly for high-speed BOSA device

Technical Field

The utility model belongs to the technical field of optical communication and 5G technique and specifically relates to a small-size optical assembly that integrates for high-speed BOSA device.

Background

With the advent of 2019, which was identified as the source of 5G commercial initiation, the 5G era has come, 5G network deployment in large scale has been actively pursued, and 5G communications are expected to be rapidly spread in the next few years. As is known, in a 5G bearer network, a single-fiber bidirectional (BiDi) scheme is a key optical transceiver module technical scheme, and compared with a dual-fiber bidirectional scheme, the bidirectional optical transceiver module not only saves half of optical fiber resources, but also can meet an application scenario with a high requirement on uplink and downlink delay symmetry. With the development of 5G networks in large-scale global construction, the demand of the market for optical transceiver modules is expected to increase explosively, and especially the demand for BiDi high-speed optical transceiver modules is expected to reach millions.

BOSA (Bi-directional Optical Sub-Assembly), also called single-fiber bidirectional Optical transceiver subassembly, is a core device in the BiDi Optical transceiver module. In the existing BOSA device, there are two main technical solutions, one is implemented by using Wavelength Division Multiplexing (WDM) with different wavelengths, and the other is implemented by using the same (or different) wavelength in combination with a circulator, and the schematic diagrams are shown in fig. 1 and fig. 2; among these, the industry suggests that WDM schemes are preferred over circulator schemes.

For a high-speed (not less than 25 Gb/s) BOSA device adopting a WDM scheme, a typical optical path structure is shown in fig. 3, and mainly includes a transmitting end Laser (LD) and a coupling component, an optical isolator, a 45-degree optical splitter, a bandpass filter, a receiving end Photodiode (PD) and a coupling component, and a common end optical fiber ferrule component, and a transmission beam in the optical path is usually an uncollimated beam. Wherein, optical isolator, 45 degrees slide and band pass filter are three key optical element in the BOSA light path: isolators are used to isolate the reflected light in the system from interfering with the light source back to the emitting end, which is essential in high speed BOSA; the 45-degree light splitting sheet does not have polarization correlation and is used for separating a transmitting signal lambda 1 and a receiving signal lambda 2, and one path of light transmits and reflects the other path of light to realize the WDM function; the band-pass filter is placed in front of the receiving end and used for isolating noise signals except the received signal lambda 2 and reducing crosstalk. In such a typical optical path structure, the 45-degree optical splitter is the most critical component for implementing the WDM function, and when the wavelength interval Δ λ = | λ 1- λ 2| between the transmitted signal and the received signal is greater than or equal to 40nm, such as λ 1=1270nm and λ 2=1310nm, the 45-degree optical splitter is difficult to manufacture, but can still be produced in mass; however, when the wavelength interval is less than 15nm, such as λ 1=1296nm and λ 2=1309nm, considering the bandwidths of the transmit and receive signal wavelengths and the non-polarization dependence of the receive signal wavelength (note: when 45 degree incidence is used, the spectral separation of S-polarized light and P-polarized light is large), and the incidence angle needs to satisfy a large tolerance to accommodate the non-collimated optical path, the difficulty of coating the 45 degree splitter is high, the yield is low, which results in high cost and low mass production feasibility of BOSA.

In summary, we can see that: in the BOSA optical path structure based on the WDM scheme in the prior art, the optical elements are mutually separated, the assembly and debugging are complicated and time-consuming, the size is difficult to miniaturize, the cost is high, and the 45-degree optical filter is difficult to realize the application scene of short wavelength interval of transmitting and receiving signals.

Disclosure of Invention

To the situation of the prior art, the utility model aims to provide a small-size optical assembly that integrates that the structure is small-size and integrate, easily make and volume production and with low costs, excellent performance have the high advantage of reliability concurrently for high-speed BOSA device integrates.

In order to realize the technical purpose, the utility model adopts the technical scheme that:

a small-sized integrated optical component for a high-speed BOSA device comprises a polarizing film, a first optical filter, a half-wave plate, a Faraday rotation plate and a polarization light splitter which are sequentially attached;

a quarter-wave plate and a reflector are sequentially attached to one side surface of the polarization light splitter, which is adjacent to the Faraday rotation plate;

and a second optical filter is also attached to the other side surface of the polarization light splitter, which is adjacent to the Faraday rotator.

Wherein, the scheme refers to

The polaroid is an absorption polaroid, and the transmission direction of the polaroid is parallel to the polarization direction of the laser at the transmitting end;

the first optical filter is a band-pass optical filter, central rays of incident light are incident at a small angle close to 0 degree, the optical filter can realize high transmittance of wavelength signals input by the transmitting end, and meanwhile, the input signals of the public end are isolated by high reflectance;

the half-wave plate is of a single half-wave plate structure or a combined half-wave plate structure, and an included angle of 22.5 degrees is formed between the optical axis of the half-wave plate and the polarization direction of incident light;

the polarization light splitter is formed by attaching and fixing two 45-degree right-angle prisms into a whole, and a polarization light splitting film is plated on the inclined surface of one of the two right-angle prisms; wherein, the gluing or optical glue is adopted in the gluing mode, and if the gluing is adopted, the glue used for gluing comprises one or more of UV glue, thermal curing glue, double curing glue and the like;

the quarter wave plate is of a single quarter wave plate structure or a combined quarter wave plate structure, and the optical axis direction of the quarter wave plate and the polarization direction of incident light form an included angle of 45 degrees;

the reflector is a polished glass sheet with one surface plated with a high-reflection dielectric film or a metal film;

the second optical filter is a band-pass optical filter, central rays of incident light are incident at an incident angle close to 0 degree, the optical filter can realize high transmittance of input signals at the public end, and meanwhile, the input signals at the transmitting end are isolated by high reflectivity;

the above components are glued together in a certain order.

The glued assembly parts form a free space isolator structure which has the function of simultaneously isolating the transmitting end signal and the common end input signal which are transmitted reversely;

preferably, the second optical filter, the polarization light splitter, the quarter-wave plate and the reflector are sequentially glued together from bottom to top, and the second optical filter, the polarization light splitter, the half-wave plate and the first optical filter are glued on the left side of the polarization light splitter to realize the polarization light splitting and light combining functions of the unpolarized light signal input from the public end;

preferably, the glue used for gluing in the optical assembly comprises one or more of UV glue, heat-curable glue, dual-curable glue and the like;

furthermore, in order to reduce the insertion loss, the reflection loss of the interface can be reduced or eliminated by adopting a method of plating an anti-reflection coating on a gluing interface through which an optical path passes according to the difference of the refractive indexes of materials, and if the refractive index of the glue after curing is close to that of the material of the optical element, the anti-reflection coating does not need to be plated;

in a possible embodiment, the faraday rotator is a 45-degree self-carrying faraday rotator or an applied magnetic field faraday rotator, and in the case of the applied magnetic field faraday rotator, a magnetic field generator is provided on the outer circumferential side of the faraday rotator.

In one possible embodiment, the polarization beam splitter is formed by integrally bonding and fixing the inclined surfaces of two 45-degree right-angle prisms, and a polarization beam splitting film is disposed between the bonded inclined surfaces.

As a preferred alternative, preferably, the polarization beam splitter is formed by gluing, gluing or deepening the inclined planes of two 45-degree right-angle prisms.

As a possible implementation mode, further, the reflector is a high-reflection dielectric film formed by plating or a polished glass sheet with a metal film.

As a possible embodiment, further, an end face of the polarizing plate away from the first filter forms an emission end, an end face of the second filter away from the polarization splitter forms a reception end, and an end face of the polarization splitter away from the faraday rotator forms a common end.

Furthermore, in order to reduce the insertion loss of the input/output signals, antireflection films are plated on the receiving end, the transmitting end and the common end of the optical component.

As a preferred option, preferably, an LD module is disposed on one side of the transmitting end, a first coupling module is further disposed between the LD module and the polarizer, a PD module is disposed on one side of the receiving end, and a second coupling module is further disposed between the PD module and the polarization splitter; and an optical fiber ferrule assembly is arranged on one side of the public end.

As a preferred option, the first coupling component and the second coupling component are both collimating lenses.

As a preferred alternative, it is preferable that the transmitting end, the receiving end and the common end are provided with wedge pieces.

As an implementation variant, the half-wave plate and the faraday rotator may be interchanged or the half-wave plate and the first filter may be interchanged.

The scheme can adopt the combination of two 0-degree (small-angle) incident optical filters and a polarization light splitting element, realizes the single-fiber bidirectional (BiDi) function which needs to be realized by the BOSA with the 45-degree optical filter in the prior art, and greatly reduces the manufacturing difficulty of the optical filter. Especially in BOSA with high speed and long distance (speed is more than or equal to 25Gb/S and distance is 40 km), in order to reduce time delay difference caused by dispersion, the wavelength distance between a transmitting end and a receiving end is required to be as small as possible, and under the condition, a non-polarization-related 45-degree optical filter is manufactured, because S polarization and P polarization spectral separation is large, and an incident angle needs to meet large tolerance to adapt to a non-collimated optical path, the existing coating technology is difficult to realize; and much easier for filters with near 0 degree (small angle) incidence.

Adopt foretell technical scheme, compared with the prior art, the utility model, its beneficial effect who has is: the utility model integrates the functions of the isolator, the optical filter, the polarization beam splitting and the light combining, thereby not only realizing small integration and greatly saving the material cost and the difficulty of light path adjustment, but also not needing to greatly change the prior BOSA structure; the utility model discloses a combination of two 0 degrees incident light filters and polarization beam splitting component has realized that BOSA needs the two-way (BiDi) function of single fiber that 45 degrees light filters will reach under the prior art, greatly reduced the manufacturing degree of difficulty and the cost of light filter. Compared with the layout of the separation optical elements in the traditional BOSA, the scheme integrates the functions of the isolator, the light splitting sheet, the polarization light splitting and the light combining into a whole, achieves small integration, and greatly saves material cost and light path adjustment difficulty; furthermore, the utility model discloses still have advantages such as workable and volume production, with low costs, excellent performance and reliability height, the utility model discloses a main performance index such as isolation, differential loss satisfies the high standard requirement that corresponds in the trade completely, has wide market commercial prospect.

Drawings

The scheme of the invention is further explained by combining the attached drawings and the detailed embodiment:

fig. 1 is one of the technical solutions of the conventional BiDi optical transceiver module;

fig. 2 shows a second technical solution of the conventional BiDi optical transceiver module;

FIG. 3 is a typical optical path structure in a high speed BOSA device employing a WDM scheme;

fig. 4 is a schematic three-dimensional view of an embodiment of the present invention;

fig. 5 is one of the schematic optical path diagrams of the embodiment of the present invention, which shows the propagation schematic of the optical signal from the transmitting end to the common end;

fig. 6 is a second schematic optical path diagram of an embodiment of the present invention, which shows a schematic propagation of an optical signal from a common end to a receiving end;

fig. 7 is a schematic view of an application structure of the present invention, which is a non-collimated light path;

fig. 8 is a schematic diagram of an application structure of the present invention, which is a collimated light path;

fig. 9 is a schematic diagram of the optical assembly of the present invention, after wedge angle pieces are added to the transmitting end, the common end and the receiving end.

Detailed Description

As shown in one of fig. 4 to fig. 6, the small integrated optical assembly for a high-speed BOSA device of the present invention includes a polarizer 1, a first optical filter 2, a half-wave plate 3, a faraday rotator 4, and a polarization splitter 5, which are sequentially attached;

a quarter-wave plate 6 and a reflector 7 are sequentially attached to one side surface of the polarization light splitter 5 adjacent to the Faraday rotator 4;

and a second optical filter 8 is also attached to the other side surface of the polarization light splitter 5 adjacent to the Faraday rotator 4.

The structure of the scheme is provided with three input/output ports which respectively correspond to a transmitting end, a public end and a receiving end of the BOSA device.

An emitting end is formed on the end face of the polarizing plate 1 far away from the first optical filter 2, a receiving end is formed on the end face of the second optical filter 8 far away from the polarization splitter 5, and a common end is formed on the end face of the polarization splitter 5 far away from the Faraday rotator 4.

In addition, the polarizing plate 1 mentioned in the present embodiment is an absorption polarizing plate, and the transmission direction thereof is parallel to the polarization direction of the laser at the emission end; the first optical filter 2 is a band-pass optical filter, the central light of the incident light is incident at a small angle close to 0 degree, the first optical filter 2 can realize high transmittance of the wavelength signal input by the transmitting end, and meanwhile, the input signal of the public end is isolated by high reflectance; the half-wave plate 3 is of a single half-wave plate or combined half-wave plate structure, and the optical axis of the half-wave plate and the polarization direction of incident light form an included angle of 22.5 degrees; the Faraday rotator 4 is a 45-degree self-carrying magnetic Faraday rotator or an externally-applied magnetic field Faraday rotator, and when the Faraday rotator is an externally-applied magnetic field Faraday rotator, a magnetic field generating device is arranged on the outer peripheral side of the Faraday rotator; the polarization light-splitting body 5 is jointed and fixed into a whole by two 45-degree right-angle prisms, one of the right-angle prisms is plated with a polarization light-splitting film, and the jointing mode adopts gluing or optical cement; the quarter-wave plate 6 is a single quarter-wave plate or a combined quarter-wave plate structure, and the optical axis of the quarter-wave plate and the polarization direction of incident light form an included angle of 45 degrees; the reflector 7 is a polished glass sheet with one surface plated with a high-reflection dielectric film or a metal film; the second optical filter 8 is a band-pass optical filter, the central light of the incident light is incident at an incident angle close to 0 degree, and the optical filter can realize high transmittance of the input signal of the public end and simultaneously isolate the input signal of the transmitting end with high reflectivity.

The working principle of the structure of the scheme is as follows:

referring to fig. 5, which shows a schematic diagram of an optical path from an emission end to a common end in the present embodiment, an emission end optical signal λ 1 (with a center wavelength of 1295.56nm) is P-polarized light, a polarization direction is parallel to a paper surface, the optical signal is incident into a polarizer 1 with a transmission direction parallel to a polarization direction of the P light, passes through the polarizer with a high transmittance, and then enters a first optical filter 2, the first optical filter 2 has a high transmittance for the emission end optical signal λ 1, the optical signal enters a half-wave plate 3 after passing through the first optical filter 2, an optical axis of the half-wave plate 3 forms an angle of-22.5 degrees with an X axis, the polarization direction of the optical signal rotates clockwise 45 degrees with respect to the P light after passing through the half-wave plate 3, forms an angle of-45 degrees with the X axis, and then enters a 45-degree faraday plate 4, the optical signal is rotated 45 degrees after passing through the polarizer, is changed into the P light again, and then enters, the polarization beam splitter 5 transmits P light (S light is reflected), and after passing through the polarization beam splitter, the optical signal enters the common terminal.

In the optical path, the polaroid 1, the half-wave plate 3, the Faraday rotator 4 and the polarization beam splitter 5 form a forward-direction passing and reverse-direction isolating isolator structure which has the function of simultaneously isolating a transmitting end signal transmitted in a reverse direction and a common end input signal.

As shown in fig. 6, which shows a schematic diagram of an optical path from the common end to the receiving end in the present embodiment, an optical signal λ 2 (with a center wavelength of 1309.14nm) output from the common end is unpolarized light, and is incident on the polarization beam splitter 5 and then split into S-polarized light and P-polarized light, where:

for S light: after passing through the polarization light splitter 5, light is reflected upwards to turn 90 degrees, then enters the quarter-wave plate, the optical axis of the quarter-wave plate and the polarization direction of S light form an included angle of 45 degrees, the S polarized light becomes circularly polarized light after passing through the quarter-wave plate 6, then enters the reflector 7, the reflecting surface of the reflector 7 is arranged on one side facing air, an optical signal is reflected by the reflector 7 and returns to the original path, the circularly polarized light passes through the quarter-wave plate 6 again, is converted into P polarized light, then enters the polarization light splitter 5 again and completely penetrates the second optical filter 8, the second optical filter 8 has high transmittance on a public end output optical signal lambda 2, and after passing through the second optical filter 8, the optical signal enters the receiving end.

For P light: observing from left to right, directly transmitting the light through the polarization light splitter, entering a 45-degree Faraday rotator 4, after passing through the Faraday rotator 4, rotating the P light in a polarization direction by 45 degrees in a counterclockwise direction and forming a 45-degree included angle with an X axis, then entering a half-wave plate 3, wherein the included angle between an optical axis of the half-wave plate 3 and the X axis is-22.5 degrees, after passing through the half-wave plate 3, the polarization direction of the light is changed into S light parallel to the Y axis, and then the S light is incident on a filter film of a first optical filter 2, because the filter film of the first optical filter 2 is a high-reflection film for an incident light signal lambda 2 at a common end, the light signal is reflected and then returns along an original path to pass through the half-wave plate 3 and the 45-degree Faraday rotator 4 again, the polarization state of the S light is respectively rotated by 135 degrees and 45 degrees in the counterclockwise direction, namely rotated by 180 degrees, the polarization state of the light is still the S light, and then enters the polarization, and the optical signal enters a second optical filter 8, the second optical filter 8 has high transmittance on the optical signal lambda 2, and the optical signal enters a receiving end after passing through the second optical filter 8.

In order to achieve the aplanatism of splitting and combining the S light and the P light, the aplanatism can be achieved by designing the thickness of a glass sheet for processing the reflecting mirror, the method is simple, and no additional cost is introduced.

The structure of this embodiment is not the only structure, and the positions of the half-wave plate 3 and the faraday rotator 4 can be interchanged, and the positions of the half-wave plate 3 and the first optical filter 2 can also be interchanged, without affecting any performance of the assembly.

In the embodiment, the isolator function, the polarization splitting and light combining function and the reflection and isolation function of the two band-pass filters on irrelevant noise signals are integrated, so that the whole optical assembly has very good low crosstalk indexes.

In the embodiment, in order to reduce the insertion loss, the reflection loss of the interface is reduced or eliminated by adopting a method of plating an anti-reflection coating on the gluing interface through which a light path passes according to the difference of the refractive indexes of materials, and if the refractive index of the glue after curing is close to that of the material of the optical element, the anti-reflection coating does not need to be plated; meanwhile, in order to reduce the insertion loss of the input/output signals, the input/output ports of the optical module of the present invention are all plated with antireflection films. Thus, the overall optical assembly has very good low insertion loss.

In this embodiment, if the incident light signal of the transmitting terminal is S light, compared with the foregoing structure, only the transmission direction of the polarizer 1 needs to be rotated by 90 degrees, the counterclockwise included angle of the optical axis of the half-wave plate 3 relative to the polarization direction of S light is 22.5 degrees, and the incident signal S light becomes P light after passing through the half-wave plate 3 and the 45-degree faraday rotator plate 4, so that the same function can be realized, and the working principle is not repeated herein.

The application structure of the utility model is briefly explained as follows:

application example 1

As shown in fig. 7, the structure of the optical assembly adopted in the present application example is the same as that described above, that is, the polarizer 1, the first optical filter 2, the half-wave plate 3, the faraday rotator 4, the polarization splitter 5, the quarter-wave plate 6, the reflector 7 and the second optical filter 8 are all the same as those described above, in the present application example, the emitting end thereof is composed of a laser 11 (laser diode, LD) and a coupling lens 12, the coupling lens 12 is independent or packaged together with the laser, and the light at the emitting end is the outgoing polarized light; the public end is an optical fiber ferrule assembly 51, and emergent light of the public end is unpolarized light and non-collimated light; the receiving end is composed of a photodiode 81(PD) and a coupling lens 82, which is separate from or packaged with the photodiode. At this time, the transmitted light beam in the light assembly is a non-collimated light beam.

Application example 2

As shown in fig. 8, the structure of the optical assembly adopted in the present application example is the same as that described above, that is, the polarizing plate 1, the first optical filter 2, the half-wave plate 3, the faraday rotator 4, the polarization splitter 5, the quarter-wave plate 6, the reflector 7 and the second optical filter 8 are all the same as those described above, in the present application example, the emitting end is composed of an LD 11 and a collimating lens group 12, the collimating lens 12 is separate or packaged together with a laser, and the emergent light of the emitting end is polarized light; the public end consists of an optical fiber ferrule assembly 51 and a collimating lens, and emergent light of the public end is unpolarized light and non-collimated light; the receiving end is composed of a PD 81 and a coupling lens 82, and the coupling lens 82 is separate from or packaged with a photodiode. At this time, the transmitted light beam in the light assembly is a collimated light beam.

The most typical application of the embodiment is that in BOSA with a 5G backhaul of 50Gb/s and a 40km distance and a wavelength of 1295.56nm/1309.14nm, the index completely meets the requirements of an optical transceiver for high-speed and long-distance transmission.

Referring to fig. 9, as the utility model relates to a supplementary of scheme, in order to promote circulator Return Loss (RL) performance, can the utility model discloses a technique that transmission end, common port and receiving port pass through veneer or optical cement respectively increases the same low-angle wedge piece 9 of an angle, and the outgoing beam and terminal surface are non-90 this moment, can promote the RL performance.

As a further supplement to the design of the present invention, in order to improve the Return Loss (RL) performance of the circulator, the incident surface and the bottom surface of the whole structure may also be processed to have a relationship other than 90 °.

It is particularly pointed out that, the utility model discloses each optical element in the optical assembly all can be processed into rectangular according to optimum length in advance, then with each rectangular alignment, need not through complicated debugging and counterpoint, then adopt the veneer technology equipment to assemble integrally together, cut into a plurality of finished products with rectangular at last again, this greatly reduced the expense of assembly and processing, easy volume production.

The utility model discloses a small-size optical assembly size that integrates can accomplish to be less than 1mm, and the small-size structure that integrates not only helps reducing material cost by a wide margin, more helps satisfying the demand of following miniaturized BOSA device to miniature optical element.

While the invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (10)

1. A small-size integrated optical assembly for high-speed BOSA device which characterized in that: the polarization filter comprises a polarizing film, a first optical filter, a half-wave plate, a Faraday rotation plate and a polarization light splitter which are sequentially attached;

a quarter-wave plate and a reflector are sequentially attached to one side surface of the polarization light splitter, which is adjacent to the Faraday rotation plate;

and a second optical filter is also attached to the other side surface of the polarization light splitter, which is adjacent to the Faraday rotator.

2. A small form factor integrated optical package for high speed BOSA devices according to claim 1, wherein: the Faraday rotator is a 45-degree self-carrying magnetic Faraday rotator or an externally-applied magnetic field Faraday rotator, and when the Faraday rotator is an externally-applied magnetic field Faraday rotator, a magnetic field generating device is arranged on the periphery of the Faraday rotator.

3. A small form factor integrated optical package for high speed BOSA devices according to claim 1, wherein: the polarization light splitter is formed by jointing and fixing the inclined planes of two 45-degree right-angle prisms into a whole, and a polarization light splitting film is arranged between the jointed inclined planes.

4. A small scale integrated optical package for high speed BOSA devices according to claim 3, wherein: the polarization light splitter is formed by fixedly gluing the inclined planes of two 45-degree right-angle prisms into a whole through optical cement or deepened optical cement.

5. A small form factor integrated optical package for high speed BOSA devices according to claim 1, wherein: the reflector is a high-reflection dielectric film formed by plating or a polished glass sheet with a metal film.

6. A small form factor integrated optical package for high speed BOSA devices according to claim 1, wherein: the end face of the polaroid far away from the first optical filter forms an emitting end, the end face of the second optical filter far away from the polarization light splitter forms a receiving end, and the end face of the polarization light splitter far away from the Faraday rotator forms a public end.

7. A small form factor integrated optical package for high speed BOSA devices according to claim 6, wherein: an LD assembly is arranged on one side of the transmitting end, a first coupling assembly is arranged between the LD assembly and the polaroid, a PD assembly is arranged on one side of the receiving end, and a second coupling assembly is arranged between the PD assembly and the polarization light splitter; and an optical fiber ferrule assembly is arranged on one side of the public end.

8. A small form factor integrated optical package for high speed BOSA devices according to claim 7, wherein: the first coupling assembly and the second coupling assembly are both collimating lenses.

9. A small form factor integrated optical package for high speed BOSA devices according to claim 7, wherein: and wedge angle pieces are arranged on the transmitting end, the receiving end and the public end.

10. Compact integrated optical component for high speed BOSA devices according to one of claims 1 to 9, characterized in that: and the positions of the half-wave plate and the Faraday rotation plate are interchanged or the positions of the half-wave plate and the first optical filter are interchanged.

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