CN109799619B - 8-channel polarization combiner - Google Patents
8-channel polarization combiner Download PDFInfo
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- CN109799619B CN109799619B CN201910288051.1A CN201910288051A CN109799619B CN 109799619 B CN109799619 B CN 109799619B CN 201910288051 A CN201910288051 A CN 201910288051A CN 109799619 B CN109799619 B CN 109799619B
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Abstract
An 8-channel polarization combiner for combining 8 single-channel optical signals incident in parallel into one output, comprising: the first wave combining component comprises a first reflection unit and a filter unit group; the second wave combining component comprises a first polarization adjusting unit, a second reflecting unit and a first polarization wave combining unit; the third wave combining component comprises a second polarization adjusting unit, a third reflecting unit and a second polarization wave combining unit; the fourth wave combining component comprises a fourth reflecting unit and a third polarization wave combining unit. The optical path stability problem of 4 wavelength light beam combination in the prior art is solved, the optical path is short, the optical path is convenient to stabilize, the device and the module with small size are formed due to small size, the optical path is suitable for 8 channels/wavelength, and the optical path stability circuit can be applied to a 200G/400G high-speed optical transceiver module.
Description
Technical Field
The invention relates to the optical communication technology, in particular to a high-speed optical transceiver module, and particularly relates to an 8-channel polarization combiner for a 200G/400G high-speed optical transceiver module.
Background
With the explosive growth of internet data services, the continuous emergence of applications such as cloud computing, high-performance computers, data centers and automatic driving, the requirements of optical fiber communication on communication bandwidth are higher and higher, ranging from megabit rate to giga to 10G, extending to 40G/100G and the future 200G/400G requirements.
Due to the bottleneck of the electrical transmission rate, for an optical fiber communication module with the transmission rate required to be at 100G/200Gbps, in order to ensure that data can be transmitted at a high speed in a long distance, a large number of wavelength division multiplexing/demultiplexing technologies are adopted, that is, 4 paths of optical signals with different wavelengths are multiplexed and used in a single mode optical fiber for transmission, specifically, an optical transmitting module multiplexes 4 paths of optical signals with different wavelengths and transmits the multiplexed optical signals to an optical receiving module through the single mode optical fiber, and the optical receiving module demultiplexes the 4 wavelengths. Therefore, the signal rate of each wavelength channel only needs to reach 25G/50Gbps, and the signal transmission rate requirement of 100G/200Gbps can be met.
The Thin Film Filter (TFF) technology is one of the commonly used solutions for multiplexing/demultiplexing such 4 wavelength optical signals. As shown in fig. 1, a solution of the prior art currently includes an oblique prism 100 coated with an antireflection film 101 (AR film) and a high-reflection film 102 (HR film) at a specified position on one side, and 4 TFF films 103 are attached to the other side of the oblique prism 100, where 4 wavelength light beams enter the oblique prism 100 from different positions through the corresponding TFF films 103, and the 4 wavelength light beams enter the oblique prism 100 through the 4 TFF films 103, and then are finally combined to form a light beam output.
However, in this solution, the reflection times of the 4 wavelength light beams during transmission are different (six times of reflection is needed at most), so that the optical paths of the respective wavelength light beams are different and affected by the position angles of the laser chip, the collimating lens and the diaphragm (for example, the light beams are shifted due to thermal expansion), and an excessive reflection time of the light beams may cause an excessive shift of the light beams, which causes instability of the light beams, and thus the reliability of the wavelength division multiplexer is low. And most importantly, for multiplexing of more wavelengths, such as 8 wavelengths, the optical path cannot be controlled in this way, and the longitudinal size is too large to meet the packaging requirement of the optical communication module.
CN104460009A discloses a combiner, which proposes another 4-wavelength combining method. The basic principle is that the wavelength combination is carried out by a thin film filter plate through long-wavelength transmission and low-reflection (long-wave transmission and short-wave reflection) or low-wavelength transmission and low-reflection (short-wave transmission and long-wave reflection) or band-pass TFF, then the polarization conversion is carried out by a half-wave plate, the wave combination is carried out, and the light after wave combination has two polarizations. The last combined wave is two polarized lights which are perpendicular to each other, and the two polarized lights are respectively aligned to a transmission axis and a reflection axis of the polarization combined wave PBC (for example, the polarization in the transmission X direction simultaneously reflects the polarization in the Y direction, and the transmission direction is the Z direction), so that the combined wave includes two polarization directions (the X direction and the Y direction), and thus, the following 5 paths and 6 paths both include two polarization directions which are perpendicular to each other, and the combined wave cannot be performed according to the thought. The scheme has the problems that wave combination cannot be continued, the scheme cannot be directly extended to 8-wavelength multiplexing scenes, and the scheme cannot be directly extended to the application requirements of 200G/400G.
Disclosure of Invention
The present invention is directed to overcome the above disadvantages of the prior art, and provides an 8-channel polarization combiner, which not only solves the problem of optical path stability of combining 4 wavelength light beams in the prior art, and realizes that the optical path has a short optical path length, which is convenient for stabilizing the optical path, and the small size facilitates the formation of small-sized devices and modules, but also is suitable for 8 channels/wavelengths, and can be applied to 200G/400G high-speed optical transceiver modules.
In order to achieve the purpose of the invention, the following technology is adopted:
an 8-channel polarization combiner for combining 8 single-channel optical signals incident in parallel into one output, comprising:
the first wave combining component comprises a first reflecting unit and a filter unit group, wherein the filter unit group is arranged opposite to the first reflecting unit and is matched with the first reflecting unit to combine the first path of light and the fifth path of light into first combined light, combine the second path of light and the sixth path of light into second combined light, combine the third path of light and the seventh path of light into third combined light, combine the fourth path of light and combine the eighth path of light into fourth combined light;
the second wave combining component comprises a first polarization adjusting unit, a second reflecting unit and a first polarization wave combining unit which is matched with the first polarization adjusting unit and the second reflecting unit to combine the first combined light and the second combined light into fifth combined light;
the third wave combining component comprises a second polarization adjusting unit, a third reflecting unit and a second polarization wave combining unit which is matched with the second polarization adjusting unit and the third reflecting unit to combine the third combined light and the fourth combined light into sixth combined light;
and the fourth wave combining component comprises a fourth reflecting unit and a third polarization wave combining unit which is matched with the fourth reflecting unit to combine the fifth combined light and the sixth combined light into one path of light.
According to the above concept: the first reflection unit is arranged in the transmission direction of the first path of light, the second path of light, the third path of light and the fourth path of light, forms an included angle of 45 degrees with the transmission direction, and is used for turning the transmission direction of the first path of light, the second path of light, the third path of light and the fourth path of light to the filtering unit group;
the filtering unit group is arranged in parallel with the first reflection unit, and comprises a first filter plate arranged in a fifth path of light transmission direction, a second filter plate arranged in a sixth path of light transmission direction, a third filter plate arranged in a seventh path of light transmission direction and a fourth filter plate arranged in an eighth path of light transmission direction, wherein:
the first filter plate transmits the fifth path of light, reflects the first path of light transmitted by the first reflection unit, and combines the first path of light in the transmission direction of the transmitted fifth path of light to obtain first combined light;
the second filter plate transmits the sixth path of light, reflects the second path of light transmitted by the first reflection unit, and combines the second path of light in the transmission direction of the transmitted sixth path of light to obtain second combined light;
the third filter plate transmits the seventh path of light, reflects the third path of light transmitted by the first reflection unit, and combines the third path of light in the transmission direction of the transmitted seventh path of light to obtain third combined light;
and the fourth filter plate transmits the eighth path of light, reflects the fourth path of light transmitted by the first reflection unit, and combines the fourth path of light in the transmission direction of the transmitted eighth path of light to obtain fourth combined light.
According to the above concept, the first polarization adjustment unit is configured to adjust the polarization direction of one of the first combined light and the second combined light, so that the polarization directions of the first combined light and the second combined light are perpendicular to each other;
the first polarization wave combining unit is used for transmitting one of the first combined light and the second combined light and reflecting the other combined light which is transmitted by the second reflecting unit and is vertical to the polarization direction of the transmitted light beam so as to combine the first combined light and the second combined light into fifth combined light.
According to the above concept, one arrangement of the first polarization adjustment unit, the second reflection unit and the first polarization combining unit is as follows:
the first polarization adjusting unit is arranged in the transmission direction of the first path combining light and is used for adjusting the polarization direction of the first path combining light;
the second reflecting unit is arranged in the transmission direction of the second combined light and used for adjusting the transmission direction of the second combined light;
the first polarization combining unit is arranged behind the first polarization adjusting unit, is positioned in the transmission direction of the first combined light, and is used for transmitting the first combined light after the polarization direction is adjusted by the first polarization adjusting unit and reflecting the second combined light after the polarization direction is adjusted by the second reflecting unit and is vertical to the first combined light, so that the first combined light and the second combined light are combined into fifth combined light.
According to the above concept, another arrangement of the first polarization adjustment unit, the second reflection unit and the first polarization combining unit is as follows:
the first polarization adjusting unit is arranged in the transmission direction of the first path combining light and is used for adjusting the polarization direction of the first path combining light;
the second reflection unit is arranged behind the first polarization adjustment unit, is positioned in the transmission direction of the first combined light, and is used for adjusting the transmission direction of the first combined light after passing through the first polarization adjustment unit;
the first polarization wave combining unit is arranged in the transmission direction of the second combined light and used for transmitting the second combined light, reflecting the first combined light transmitted by the second reflecting unit, and adjusting the polarization direction to be vertical to the polarization direction of the second combined light through the first polarization adjusting unit so as to combine the first combined light and the second combined light into fifth combined light.
According to the above concept, the second polarization adjustment unit adjusts the polarization direction of one of the third combined light and the fourth combined light, so that the polarization directions of the third combined light and the fourth combined light are perpendicular to each other;
the second polarization wave combining unit is configured to transmit one of the third combined light and the fourth combined light, and reflect another combined light transmitted by the third reflecting unit and perpendicular to the polarization direction of the transmitted light beam, so as to combine the third combined light and the fourth combined light into sixth combined light.
According to the above concept, one arrangement manner of the second polarization adjustment unit, the third reflection unit and the second polarization combining unit is as follows:
the second polarization adjusting unit is arranged in the transmission direction of the fourth combined light and is used for adjusting the polarization direction of the fourth combined light;
the third reflection unit is arranged behind the second polarization adjustment unit, is positioned in the transmission direction of the fourth combined light, and is used for adjusting the transmission direction of the fourth combined light after passing through the second polarization adjustment unit;
the second polarization wave combining unit is arranged in the transmission direction of the third combined light and is used for transmitting the third combined light, reflecting the fourth combined light which is transmitted by the third reflecting unit and has the polarization direction adjusted to be perpendicular to the polarization direction of the third combined light through the second polarization adjusting unit, and combining the third combined light and the fourth combined light into sixth combined light.
According to the above concept, the third polarization combining unit is configured to transmit one of the fifth combined light and the sixth combined light, and reflect the other combined light transmitted by the fourth reflecting unit and perpendicular to the polarization direction of the transmitted light beam, so as to combine the fifth combined light and the sixth combined light into one light.
According to the above concept, one arrangement of the fourth reflection unit and the third polarization combining unit is as follows:
the fourth reflection unit is arranged in the transmission direction of the sixth combined light and used for adjusting the transmission direction of the sixth combined light;
the third polarization multiplexing unit is arranged in the transmission direction of the fifth multiplexed light, and is used for transmitting the fifth multiplexed light, reflecting the sixth multiplexed light transmitted by the fourth reflecting unit, and combining the fifth multiplexed light and the sixth multiplexed light into one path of light.
According to the above concept, the polarization direction of the third polarization combining unit is designed to form an angle of 45 ° with the polarization direction of the first polarization combining unit or the second polarization combining unit, so that the polarization direction of the third polarization combining unit and the polarization direction of the sixth polarization combining unit are both 45 degrees with the two orthogonal polarization directions contained in the fifth and sixth combined lights.
The technical scheme has the advantages that:
1. the problem of stable light path of 4 wavelength light beam combination in the prior art is solved, the light path has short optical path, and the light path is convenient to be stabilized; the size is small, so that small-sized devices and modules can be formed conveniently, and the device can be applied to 200G/400G optical transceiver modules;
2. compared with the existing ZigZag optical path wave combination scheme, the ZigZag optical path wave combination scheme has obviously fewer reflection times, and the reflection times of each light beam of each wave combination are different by 1 time at most, so that the ZigZag optical path wave combination scheme is beneficial to the stability of the light beams and is convenient for controlling the optical path; the optical path is obviously shortened, the size is convenient to control, and the requirement of miniaturization and packaging of the optical communication module is met.
3. The problem that the existing 4-wavelength polarization wave combination scheme cannot carry out 8-wavelength wave combination is solved.
4. The optical path used after the 8 wavelengths are combined is shortest, and the difference of the optical paths is minimum, so that the uniformity of the performance of each path of light wave in the combined optical path can be ensured.
Drawings
Figure 1 shows a prior art 4-channel wave combiner structure.
Figure 2 shows a combiner structure according to one embodiment of the invention.
Figure 3 shows a combiner structure according to another embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings.
One embodiment of the present invention is shown in FIG. 2, and comprises:
4 reflection sheets 210, 211, 212, and 213 respectively corresponding to the first, second, third, and fourth reflection units;
the 4 thin film filters 221, 222, 223 and 224 form a filter unit group which respectively corresponds to the first filter, the second filter, the third filter and the fourth filter;
2 half- wave plates 231 and 232 respectively corresponding to the first polarization adjustment unit and the second polarization adjustment unit;
the 3 polarization multiplexing films 241, 242, and 243 correspond to the first polarization multiplexing unit, the third polarization multiplexing unit, and the second polarization multiplexing unit, respectively.
The reflective sheet 210 is disposed in the transmission direction of the first path of light λ 1, the second path of light λ 2, the third path of light λ 3, and the fourth path of light λ 4, and is inclined at an included angle of 45 degrees with the transmission direction.
The filter unit group is disposed opposite to the reflection sheet 210 and parallel to the reflection sheet 210.
The thin film filter 221 is arranged in the transmission direction of the fifth light path λ 5, and is located on the reflection path of the first light path λ 1;
the thin film filter 222 is arranged in the transmission direction of the sixth light λ 6 and is positioned on the reflection path of the second light λ 2;
the thin film filter 223 is arranged in the transmission direction of the seventh light λ 7 and is positioned on the reflection path of the third light λ 3;
the thin film filter 224 is disposed in the transmission direction of the eighth light λ 8 and on the reflection path of the fourth light λ 4.
After the light signals from the 8 different wavelength lasers are collimated, 4 light waves λ 1, λ 2, λ 3, λ 4 are directed to the reflective sheet 210, and the remaining 4 wavelengths λ 5, λ 6, λ 7, λ 8 are propagated to the corresponding thin film filters 221, 222, 223, 224. The light waves λ 1, λ 2, λ 3, λ 4 reflected by the light source 210 are propagated to the corresponding thin film filters 221, 222, 223, 224, respectively.
221 is capable of reflecting the λ 1 wavelength and transmitting the λ 5 wavelength, thereby combining the two wavelengths λ 1, λ 5 to propagate as one beam; likewise, 222 is capable of reflecting the λ 2 wavelength and transmitting the λ 6 wavelength, thereby combining the two wavelengths λ 2, λ 6 to propagate as one beam; 223 are capable of reflecting the λ 3 wavelength and transmitting the λ 7 wavelength, thereby combining the two wavelengths λ 3, λ 7 to propagate as one beam; 224 are capable of reflecting the λ 4 wavelength and transmitting the λ 8 wavelength, thereby combining the two wavelengths λ 4, λ 8 to propagate as one beam; thus, the 8 wavelength light waves are combined into 4 light waves, each light beam comprises two wavelengths, namely a light beam (lambda 1+ lambda 5), a light beam (lambda 2+ lambda 6), a light beam (lambda 3+ lambda 7) and a light beam (lambda 4+ lambda 8), and the propagation directions are respectively in the directions of lambda 5, lambda 6, lambda 7 and lambda 8.
The half-wave plate 231 is disposed in the transmission direction of the light beam (λ 1+ λ 5), i.e., in the λ 5 direction; the polarization wave combining membrane 241 is arranged behind the half-wave plate 231, is inclined by 45 degrees with the lambda 5 direction, and is vertical to the reflector 210; the reflector 211 and the polarization multiplexing film 241 are disposed opposite to each other and parallel to each other, and are located in the transmission direction of the light beam (λ 2+ λ 6), i.e., in the λ 6 direction.
The half-wave plate 232 is disposed in the transmission direction of the light beam (λ 4+ λ 8), i.e., in the λ 8 direction; the polarization wave combination film 243 is arranged in the transmission direction of the light beam (λ 3+ λ 7), i.e. in the λ 7 direction; the reflector 212 is disposed opposite to and parallel to the polarization multiplexing film 241, and is located behind the half-wave plate 232 and in the λ 8 direction.
The light beam (I) passes through a half-wave plate (231) which has the function of rotating the polarization direction of the light beam by 90 degrees and then transmits through a polarization wave combining membrane (241); meanwhile, the light beam (λ 2+ λ 6) is reflected by the reflective film 211 to the polarization multiplexing film 241, and the polarization multiplexing film transmits the P-polarized light beam and reflects the S-polarized light beam passing through the polarization direction perpendicular to the P-polarized light beam, so that the light beam (i) and the light beam (ii) are combined by the polarization multiplexing film 241 into a light beam (v) including four wavelengths of λ 1, λ 2, λ 5, and λ 6, and the propagation direction is in the direction of the λ 5 light beam.
Similarly, the light velocity (c) is transmitted through the polarization wave combining film 242 to the polarization wave combining film 243 and is transmitted through, and the light beam (c) is reflected by the half-wave plate 232 and the reflector 212 to the polarization wave combining film 243 and is combined with the light beam (c) to be combined into a light beam (c) containing the wavelengths λ 3, λ 4, λ 7 and λ 8 in the λ 7 direction.
The polarization combining film 242 is disposed in the transmission direction of the light beam (λ 1+ λ 2+ λ 5+ λ 6), i.e. the λ 5 light beam direction, behind the polarization combining film 241; the reflector 213 is disposed opposite to the polarization combining film 242, is parallel to the polarization combining film 242, is located behind the polarization combining film 243, and is located in the transmission direction of the light beam (λ 3+ λ 4+ λ 7+ λ 8), i.e., the λ 7 light beam direction.
The light beam (c) travels to the polarization wave combining film 242 and is transmitted therethrough, the light beam (c) is emitted by the reflector 213, travels to the polarization wave combining film 242 and is reflected by the film 242, and the light beam (c) travels through the polarization wave combining film (c) and is combined into a light beam (b) comprising lambda 1, lambda 2, lambda 3, lambda 4, lambda 5, lambda 6, lambda 7 and lambda 88 wavelengths, thereby completing the wave combination of 8-channel light waves.
The light beam (c) and the light beam (c) both have orthogonal polarizations, specifically, the light beam (c) has two polarizations perpendicular to each other, and the light beam (c) also has two polarizations perpendicular to each other. Therefore, the polarization direction of the polarization combining film 242 is designed to have a certain angle with the two orthogonal polarization directions contained in the fifth combined light and the sixth combined light, so that both polarized lights have energy light to pass through, thereby realizing polarization combining. In the embodiment shown in fig. 1, the optimal 45-degree deflection is set to rotate the transmission axis and the reflection axis of the polarization wave combining film 242 by 45 degrees, so that 50% of energy light passes through both polarized light beams, i.e., the light beam (p) and the light beam (c), to realize polarization wave combining. The arrangement of this embodiment is only one form, and in this way, the positions of the transmitting plate and the polarization wave combining plate can be slightly adjusted to obtain different combinations, but the basic manner and the principle are not changed, and the description is omitted here.
In an embodiment of the present invention, as shown in fig. 3, only the arrangement of the second multiplexer assembly is adjusted, so as to adjust the output position of the multiplexer, specifically, the scheme includes:
4 reflection sheets 210, 211, 212, and 213 respectively corresponding to the first, second, third, and fourth reflection units;
the 4 thin film filters 221, 222, 223 and 224 form a filter unit group which respectively corresponds to the first filter, the second filter, the third filter and the fourth filter;
2 half- wave plates 231 and 232 respectively corresponding to the first polarization adjustment unit and the second polarization adjustment unit;
the 3 polarization multiplexing films 341, 342, and 343 correspond to the second polarization multiplexing unit, the first polarization multiplexing unit, and the third polarization multiplexing unit, respectively.
The reflection sheets 210, 211, 212, 213 are disposed as in embodiment 1.
Thin film filters 221, 222, 223, and 224 are arranged in the same manner as in embodiment 1.
Half- wave plates 231, 232 are arranged as in embodiment 1.
The reflector 212, the polarization multiplexing film 341, and the reflector 213 are arranged as in example 1.
The reflector 211 is arranged behind the half-wave plate 231, is positioned in the direction of lambda 5 and is parallel to the reflector 210; the polarization multiplexing film 342 is disposed opposite to the reflector 210, parallel to the reflector 210, and located in the λ 6 direction.
The polarization multiplexing film 343 is located behind the polarization multiplexing film 342, is disposed perpendicular to the polarization multiplexing film 342, and is located in the λ 6 direction.
By this position adjustment, the output position of the combined beam is changed from the λ 5 direction to the λ 6 direction.
The concept according to the present invention is not limited to the above-described embodiments. The output of the combined wave beam to the positions and directions of λ 7 and λ 8 can be adjusted by changing the positions of the half- wave plates 231, 232 and the reflection plates 211, 212, 213, which will not be described in detail here.
In a specific application, the reflector, the filter, the half-wave plate and the polarization wave combination membrane are fixed at a specified position of the same substrate according to a specified angle, and the substrate is preferably a zero-expansion or low-expansion glass substrate.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and it is apparent that those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (8)
1. An 8-channel polarization combiner for combining 8 single-channel optical signals incident in parallel into one output, comprising: the first wave combining component, the second wave combining component, the third wave combining component and the fourth wave combining component;
the first wave combining component comprises a first reflecting unit and a filter unit group, wherein the filter unit group is arranged opposite to the first reflecting unit and is matched with the first reflecting unit to combine the first path of light and the fifth path of light into first combined light, combine the second path of light and the sixth path of light into second combined light, combine the third path of light and the seventh path of light into third combined light, combine the fourth path of light and combine the eighth path of light into fourth combined light;
the second wave combining component comprises a first polarization adjusting unit, a second reflecting unit and a first polarization wave combining unit which is matched with the first polarization adjusting unit and the second reflecting unit to combine the first combined light and the second combined light into fifth combined light; the first polarization adjusting unit is used for adjusting the polarization direction of one of the first combined light and the second combined light to enable the polarization directions of the first combined light and the second combined light to be vertical; the first polarization wave combining unit is used for transmitting one of the first combined light and the second combined light and reflecting the other combined light which is transmitted by the second reflecting unit and is vertical to the polarization direction of the transmitted light beam so as to combine the first combined light and the second combined light into fifth combined light;
the third wave combining component comprises a second polarization adjusting unit, a third reflecting unit and a second polarization wave combining unit which is matched with the second polarization adjusting unit and the third reflecting unit to combine the third combined light and the fourth combined light into sixth combined light; the second polarization adjusting unit is configured to adjust a polarization direction of one of the third combined light and the fourth combined light, so that the polarization directions of the third combined light and the fourth combined light are perpendicular to each other; the second polarization wave combining unit is used for transmitting one of the third combined light and the fourth combined light and reflecting the other combined light which is transmitted by the third reflecting unit and is vertical to the polarization direction of the transmitted light beam so as to combine the third combined light and the fourth combined light into sixth combined light;
and the fourth wave combining component comprises a fourth reflecting unit and a third polarization wave combining unit which is matched with the fourth reflecting unit to combine the fifth combined light and the sixth combined light into one path of light.
2. The 8-channel polarization combiner of claim 1, wherein:
the first reflection unit is arranged in the transmission direction of the first path of light, the second path of light, the third path of light and the fourth path of light, forms an included angle of 45 degrees with the transmission direction, and is used for turning the transmission direction of the first path of light, the second path of light, the third path of light and the fourth path of light to the filtering unit group;
the filtering unit group is arranged in parallel with the first reflection unit, and comprises a first filter plate arranged in a fifth path of light transmission direction, a second filter plate arranged in a sixth path of light transmission direction, a third filter plate arranged in a seventh path of light transmission direction and a fourth filter plate arranged in an eighth path of light transmission direction, wherein:
the first filter plate transmits the fifth path of light, reflects the first path of light transmitted by the first reflection unit, and combines the first path of light in the transmission direction of the transmitted fifth path of light to obtain first combined light;
the second filter plate transmits the sixth path of light, reflects the second path of light transmitted by the first reflection unit, and combines the second path of light in the transmission direction of the transmitted sixth path of light to obtain second combined light;
the third filter plate transmits the seventh path of light, reflects the third path of light transmitted by the first reflection unit, and combines the third path of light in the transmission direction of the transmitted seventh path of light to obtain third combined light;
and the fourth filter plate transmits the eighth path of light, reflects the fourth path of light transmitted by the first reflection unit, and combines the fourth path of light in the transmission direction of the transmitted eighth path of light to obtain fourth combined light.
3. The 8-channel polarization combiner of claim 1 or 2, wherein:
the first polarization adjusting unit is arranged in the transmission direction of the first path combining light and is used for adjusting the polarization direction of the first path combining light;
the second reflecting unit is arranged in the transmission direction of the second combined light and used for adjusting the transmission direction of the second combined light;
the first polarization combining unit is arranged behind the first polarization adjusting unit, is positioned in the transmission direction of the first combined light, and is used for transmitting the first combined light after the polarization direction is adjusted by the first polarization adjusting unit and reflecting the second combined light after the polarization direction is adjusted by the second reflecting unit and is vertical to the first combined light, so that the first combined light and the second combined light are combined into fifth combined light.
4. The 8-channel polarization combiner of claim 1 or 2, wherein:
the first polarization adjusting unit is arranged in the transmission direction of the first path combining light and is used for adjusting the polarization direction of the first path combining light;
the second reflection unit is arranged behind the first polarization adjustment unit, is positioned in the transmission direction of the first combined light, and is used for adjusting the transmission direction of the first combined light after passing through the first polarization adjustment unit;
the first polarization wave combining unit is arranged in the transmission direction of the second combined light and used for transmitting the second combined light, reflecting the first combined light transmitted by the second reflecting unit, and adjusting the polarization direction to be vertical to the polarization direction of the second combined light through the first polarization adjusting unit so as to combine the first combined light and the second combined light into fifth combined light.
5. The 8-channel polarization combiner of claim 1 or 2, wherein:
the second polarization adjusting unit is arranged in the transmission direction of the fourth combined light and is used for adjusting the polarization direction of the fourth combined light;
the third reflection unit is arranged behind the second polarization adjustment unit, is positioned in the transmission direction of the fourth combined light, and is used for adjusting the transmission direction of the fourth combined light after passing through the second polarization adjustment unit;
the second polarization wave combining unit is arranged in the transmission direction of the third combined light and is used for transmitting the third combined light, reflecting the fourth combined light which is transmitted by the third reflecting unit and has the polarization direction adjusted to be perpendicular to the polarization direction of the third combined light through the second polarization adjusting unit, and combining the third combined light and the fourth combined light into sixth combined light.
6. The 8-channel polarization combiner of claim 1 or 2, wherein: the third polarization wave combining unit is used for transmitting one of the fifth combined light and the sixth combined light and reflecting the other combined light which is transmitted by the fourth reflection unit and is vertical to the polarization direction of the transmitted light beam, so that the fifth combined light and the sixth combined light are combined into one light.
7. The 8-channel polarization combiner of claim 1 or 2, wherein:
the fourth reflection unit is arranged in the transmission direction of the sixth combined light and used for adjusting the transmission direction of the sixth combined light;
the third polarization multiplexing unit is arranged in the transmission direction of the fifth multiplexed light, and is used for transmitting the fifth multiplexed light, reflecting the sixth multiplexed light transmitted by the fourth reflecting unit, and combining the fifth multiplexed light and the sixth multiplexed light into one path of light.
8. The 8-channel polarization combiner of claim 1 or 2, wherein: the polarization direction of the third polarization wave combining unit is designed to form an angle of 45 degrees with the polarization direction of the first polarization wave combining unit or the second polarization wave combining unit.
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| JP2013145356A (en) * | 2011-12-13 | 2013-07-25 | Sumitomo Electric Ind Ltd | Optical communication module |
| CN110095879B (en) * | 2013-02-27 | 2021-07-13 | 索尔思光电（成都）有限公司 | Multi-channel light emitting devices and methods of making and using the same |
| CN104460009B (en) * | 2014-12-23 | 2019-11-05 | 青岛海信宽带多媒体技术有限公司 | A kind of wave multiplexer |
| US9991964B2 (en) * | 2015-03-10 | 2018-06-05 | Finisar Corporation | Hybrid free space multiplexer for multichannel transmitter optical subassembly |
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| JP7020039B2 (en) * | 2017-10-03 | 2022-02-16 | 住友電気工業株式会社 | Manufacturing method of optical receiver module |
| CN207882498U (en) * | 2018-02-05 | 2018-09-18 | 深圳市飞宇光纤系统有限公司 | A kind of compact wavelength division multiplexer |
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