CN218272814U - Long-distance transmission single-fiber bidirectional optical device - Google Patents
Long-distance transmission single-fiber bidirectional optical device Download PDFInfo
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- CN218272814U CN218272814U CN202123388082.6U CN202123388082U CN218272814U CN 218272814 U CN218272814 U CN 218272814U CN 202123388082 U CN202123388082 U CN 202123388082U CN 218272814 U CN218272814 U CN 218272814U
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Abstract
The utility model discloses a two-way optical device of long distance transmission single fiber, include transmitting optical device and receive optical device, transmitting optical device includes laser instrument and first thermoelectric cooler, and the laser instrument sets up in first thermoelectric cooler, receive optical device and include semiconductor optical amplifier for carry out signal amplification to receiving optical signal. The receiving optical device further comprises a second thermoelectric cooler, the semiconductor optical amplifier is arranged on the second thermoelectric cooler, and the second thermoelectric cooler is arranged on the first thermoelectric cooler. The utility model discloses a semiconductor optical amplifier's setting can enlarge the received signal, can realize long distance transmission then. The two thermoelectric coolers are designed in a vertically stacked manner, so that the transverse space occupation of the thermoelectric coolers can be reduced, and the power consumption of the second thermoelectric cooler can be saved.
Description
Technical Field
The utility model relates to an optical communication technical field, concretely relates to two-way optical device of long distance transmission single fiber.
Background
The main components of an optical module product are optical devices, which are largely classified into a transmitting device and a receiving device, for a single-fiber bidirectional optical device, a transmitting end and a receiving end are packaged in the same BOX optical device, and with higher requirements on transmission rate, transmission distance and power consumption, the traditional single-fiber bidirectional optical device cannot meet application requirements.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a two-way optical device of long distance transmission single fiber to realize long distance transmission, and reduce the consumption.
The utility model discloses a following technical scheme realizes:
the long-distance transmission single-fiber bidirectional optical device comprises an emitting optical device and a receiving optical device, wherein the emitting optical device comprises a laser and a first thermoelectric cooler, the laser is arranged on the first thermoelectric cooler, and the receiving optical device comprises a semiconductor optical amplifier and is used for carrying out signal amplification on a receiving optical signal.
In the scheme, the semiconductor optical amplifier is arranged, so that the received optical signals can be amplified, long-distance transmission can be realized, and the transmission distance can reach more than 80 km.
In a further optimized solution, the receiving optical device further includes a second thermoelectric cooler, the semiconductor optical amplifier is disposed on the second thermoelectric cooler, and the second thermoelectric cooler is disposed on the first thermoelectric cooler.
In the scheme, the second thermoelectric cooler is arranged, so that the heat of the semiconductor optical amplifier can be dissipated, and the service life of the semiconductor optical amplifier is prolonged. In addition, the two thermoelectric coolers are designed in an up-and-down laminated mode, so that the transverse space occupation of the thermoelectric coolers can be reduced, and the power consumption of the second thermoelectric cooler can be saved.
In a more preferred embodiment, the laser is an EML laser.
In a more preferable embodiment, the light emitting device further includes a lens four, and the light signal emitted by the laser is transmitted through the lens four and then output.
In a more preferred embodiment, the light emitting device further comprises an emitting end isolator, and the emitting end isolator is arranged in front of the lens four in the emitting light path. The transmitting end isolator only allows light to pass through in a single direction, namely only allows the light emitted by the laser to pass through the transmitting end isolator, and does not allow the light to enter the laser, so that the transmission quality is prevented from being influenced by the reflected light entering the laser.
In a more preferred embodiment, the receiving optical device further includes a first lens, the first lens is disposed in front of the semiconductor optical amplifier in the receiving optical path, and the received optical signal is transmitted by the first lens and then enters the semiconductor optical amplifier.
In a more preferred embodiment, the receiving optical device further includes a second lens, the second lens is disposed behind the semiconductor optical amplifier in the receiving optical path, and the optical signal output by the semiconductor optical amplifier is incident on the second lens.
In a more optimized implementation scheme, the receiving optical device further comprises a 2-degree filter, the 2-degree filter is arranged behind the second lens in the receiving optical path, and the optical signal output by the second lens is incident to the 2-degree filter. Adopt 2 filters in this scheme can ensure the self-luminous of filtering SOA reliably, avoid influencing the sensitivity of receiving terminal.
In a more preferred embodiment, the receiving optical device further includes a third lens, the third lens is disposed behind the 2 ° filter in the receiving optical path, and the optical signal filtered by the 2 ° filter is input to the third lens.
In a more preferred embodiment, the receiving optical device further includes a receiving end isolator, and the receiving end isolator is disposed in front of the first lens in the receiving optical path. The receiving end isolator can prevent the SOA from spontaneously coupling to the optical fiber and only allow light coming out of the optical fiber to enter the SOA, thereby ensuring the transmission quality of optical signals.
In a more optimized implementation scheme, the optical fiber coupler further comprises a light splitting prism, wherein antireflection films, 13.5-degree filters and reflectors are arranged at different positions of the light splitting prism, so that optical signals are received and transmitted through the same interface. In this scheme, through the setting of beam splitting prism, not only realized distinguishing emission light path and receiving light path, realized realizing simultaneously the receipt and the sending of light signal then in a device, reduced whole size then, realized receiving light path and emission light path parallel to each other moreover, rather than being the vertical state, then can further reduce the whole size of optical module.
In one scheme, after being transmitted by an anti-reflection film, an optical signal at an emitting end is incident to a reflecting surface of a beam splitter prism, reflected to a reflecting plate by the reflecting surface of the beam splitter prism, reflected by the reflecting plate, incident to a 13.5-degree filter plate, reflected to a transmitting surface of the beam splitter prism by the 13.5-degree filter plate, and transmitted by the transmitting surface and output; the received optical signal is transmitted by the transmission surface of the beam splitter prism, then enters the 13.5-degree filter plate, and is received by the receiving optical device after being transmitted by the 13.5-degree filter plate.
In another scheme, a received optical signal is transmitted through a transmission surface of a light splitting prism, then enters a 13.5-degree filter, is reflected to a reflector through the 13.5-degree filter, is reflected by the reflector and then enters a reflection surface of the light splitting prism, is reflected by the reflection surface of the light splitting prism and then enters an anti-reflection film, and is received by a receiving optical device after being transmitted through the anti-reflection film; and the optical signal of the emitting end passes through the 13.5-degree filter plate, is transmitted by the 13.5-degree filter plate, is incident to the transmission surface of the beam splitter prism, and is output after being transmitted by the transmission surface of the beam splitter prism.
In a more preferred solution, the light emitting device and the light receiving device are packaged as a single unit.
In the conventional design, the transmitting laser and the receiving detector are packaged into a single assembly, and then the two assemblies are assembled together, only the transmitting chip and the receiving chip are airtight, and other optical components such as lenses are all airtight. In the above scheme, not only the transmitting chip and the receiving chip are packaged together into one component, but also the transmitting optical device including the optical element such as the lens and the receiving optical device are packaged into one component, so that not only can the size of the whole equipment be further reduced, but also other optical devices such as the lens and the like can be protected from being polluted by substances which are easy to vaporize.
Compared with the prior art, the utility model discloses a semiconductor optical amplifier's setting can enlarge the received signal, can realize long distance transmission then. The two thermoelectric coolers are designed in an up-and-down laminated mode, so that the transverse space occupation of the thermoelectric coolers can be reduced, and the power consumption of the second thermoelectric cooler can be kept unchanged.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
fig. 1 is a schematic perspective view of a long-distance transmission single-fiber bidirectional optical device in an embodiment.
Fig. 2 is a schematic arrangement diagram between the TECs 1 and 2 in the embodiment.
Fig. 3 is a top view of a long-distance transmission single-fiber bidirectional optical device in an embodiment.
Fig. 4 is a front view of a long-distance transmission single-fiber bidirectional optical device in an embodiment.
Fig. 5 is an optical path diagram of a long-distance transmission single-fiber bidirectional optical device in the embodiment.
Fig. 6 is an outline view (without a cover) of a long-distance transmission single-fiber bidirectional optical device in the embodiment.
The labels in the figure are: 11-TEC1;12-TEC2;13-EML laser; 14-lens four; 15-a right angle prism; 16-lens three; a 17-2 degree filter; 18-lens two; 19-an optical amplifier; 20-lens one; 21-a translation prism; 22-receiving end isolator; a filter with the angle of 23-13.5 degrees; 24-a reflective sheet; 25-antireflection film; 26-a transmitting end isolator; 27-a beam splitting prism; 28-interface.
Detailed Description
To make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the following examples and drawings, and the exemplary embodiments and descriptions thereof of the present invention are only used for explaining the present invention, and are not intended as limitations of the present invention.
Referring to fig. 1 to 4, the long-distance transmission single-fiber bidirectional optical device provided in this embodiment includes an optical transmitting device and an optical receiving device, the optical transmitting device includes a laser and a first thermoelectric cooler, the laser is disposed on the first thermoelectric cooler, the optical receiving device includes a semiconductor optical amplifier 19 (SOA) and a second thermoelectric cooler TEC2 12, the semiconductor optical amplifier 19 is disposed on the second thermoelectric cooler TEC2 12, and the second thermoelectric cooler TEC2 12 is disposed on the first thermoelectric cooler TEC 1.
The laser is preferably an EML laser 13. The semiconductor optical amplifier 19 is used for signal amplification of the received optical signal, so that the optical device can meet the transmission requirement of longer distance.
As shown in fig. 2 and 4, the semiconductor optical amplifier 19 is disposed on the second thermoelectric cooler TEC2 12, and the second thermoelectric cooler TEC2 12 is disposed on the first thermoelectric cooler TEC1 11, that is, the second thermoelectric cooler TEC2 and the first thermoelectric cooler TEC1 11 are disposed in an overlapping manner, which not only reduces the occupation of the second thermoelectric cooler in the lateral space and reduces the length of the entire optical device, but also maintains the power consumption of the second thermoelectric cooler unchanged even when the temperature difference between the laser and the semiconductor optical amplifier 19 is as high as 15 ℃.
Specifically, the power consumption of the TEC is mainly determined by the temperature difference between the heat load of the cold surface of the TEC and the cold and hot surfaces of the TEC, in this scheme, the TEC2 12 is placed on the TEC1 11, that is, the hot surface of the TEC2 12 is in contact with the cold surface of the TEC1 11, the TEC1 11 controls the temperature (for example, 55 ℃ to 60 ℃) of the EML laser 13, and always maintains a fixed temperature, the TEC2 12 controls the temperature (for example, 40 ℃) of the SOA of the semiconductor optical amplifier 19, and maintains a stable state, and the operating current of the SOA is also stable, so the heat generation amount of the SOA is fixed and unchanged, that is, the temperature of the cold surface and the temperature of the hot surface of the TEC2 are both fixed, and because the temperature of the SOA of the TEC2 is fixed, the heat load of the TEC2 12 is also fixed, and therefore, the power consumption of the TEC2 12 is unchanged.
It should be noted that fig. 3 shows the laser separated from the TEC1 11 and the optical amplifier 19 separated from the TEC2 12, which is merely an illustration of the angle problem. In fact, the EML laser 13 is first attached to a ceramic spacer by eutectic process, the EML laser 13 and the ceramic spacer after eutectic process are called COC, and then the COC is attached to the TEC1 11. And a layer of ceramic cushion block is arranged between the COC and the TEC1 11, and the cushion block is used for guiding out power supply of the SOA and the hot-surface resistor on the TEC2 12, and simultaneously can reduce some passive heat loads of the TEC2 12, and is helpful for power consumption.
Referring to fig. 3, in a more complete product, the light emitting device further includes a lens group iv 14 and an emitting end isolator 26, the emitting end isolator 26 is disposed in front of the lens group iv 14 in the emitting light path, and the light signal emitted by the laser enters the lens group iv 14, is transmitted by the lens group iv 14, and is output to the emitting end isolator 26. The transmitting end isolator 26 only allows light to pass in one direction, that is, only allows light emitted by the laser to pass through the transmitting end isolator 26, and does not allow light to enter the laser, so as to avoid that reflected light enters the laser and affects transmission quality.
As shown in fig. 3 and 4, the receiving optical device further includes a first lens 20, a second lens 18, a 2 ° filter 17, a third lens 16, and a right-angle prism 15, the first lens 20 is disposed in front of the semiconductor optical amplifier 19 in the receiving optical path, the second lens 18 is disposed behind the semiconductor optical amplifier 19 in the receiving optical path, the 2 ° filter 17 is disposed behind the second lens 18 in the receiving optical path, the third lens 16 is disposed behind the 2 ° filter 17 in the receiving optical path, and the right-angle prism 15 is disposed behind the third lens 16 in the receiving optical path. The received light signal is transmitted by the first lens 20 and then enters the semiconductor optical amplifier 19, the semiconductor optical amplifier 19 amplifies the input light signal, the output light signal enters the second lens 18 and is transmitted by the second lens 18 and then output to the 2-degree filter 17, the light signal filtered by the 2-degree filter 17 is input to the third lens 16, and the light signal transmitted by the third lens 16 enters the right-angle prism 15.
The filter is arranged to filter self-luminescence emitted by the SOA, because the self-luminescence of the SOA is noise, in the scheme, the filter is anti-reflection at an angle, and light emitted by the SOA is prevented from being reflected back to the SOA through the filter to cause performance degradation and possibly directly influence the sensitivity of a receiving end. The angle is as small as theoretically possible, because the wavelength is LWDM, the working interval is typical wavelength +/-1 nm, SOA has self-luminescence, the self-luminescence of SOA is noise, similar to LED is broad spectrum, and is coincident with the working wavelength, so that the SOA outside the working wavelength needs to be filtered out in a self-luminescence mode as much as possible, for the coating requirement of the filter, the smaller the incidence angle is, the easier the coating is, and because the mounting can bring the angle error to be +/-1 DEG approximately, the designed angle is 2 DEG in order to avoid the occurrence of 0 deg. In this scheme, adopt 2 filters 17 can ensure the self-luminous of filtering SOA reliably promptly, avoid influencing the sensitivity of receiving terminal.
As shown in fig. 3 and 4, the receiving-end optical device further includes a receiving-end isolator 22 and a translation prism 21. The receiving end isolator 22 is arranged in front of the translation prism 21 in the receiving light path, the translation prism 21 is arranged in front of the first lens 20 in the receiving light path, the receiving end isolator 22 prevents the SOA from coupling spontaneous light to the optical fiber, only light coming out of the optical fiber is allowed to enter the SOA, the translation prism 21 is used for translating the light in the horizontal and height directions, and the translated light enters the first lens 20.
As shown in fig. 3 and 4, the long-distance transmission single-fiber bidirectional optical device further includes a light splitting prism 27, reflection reducing films 25, 13.5 ° filters 23, and reflectors 24 are disposed at different positions of the light splitting prism 27, the reflection reducing films 25 are mainly used for reducing the optical power loss of the EML laser 13, and the 13.5 ° filters 23 mainly transmit light with a specific wavelength and reflect light with other wavelengths. In this scheme, through the setting of beam splitter prism 27, not only realized distinguishing transmission light path and receiving light path, realized realizing simultaneously in a device then that the receipt of light signal is with sending, then reduce overall dimension, realized receiving light path and transmission light path parallel to each other moreover, rather than being the vertical state, then can further reduce the overall dimension of optical module.
As shown in fig. 5, after being transmitted through the anti-reflection film 25, the optical signal at the transmitting end enters the reflection surface 271 of the light splitting prism 27, is reflected to the reflection sheet 24 by the reflection surface 271 of the light splitting prism 27, enters the 13.5 ° filter 23 by being reflected by the reflection sheet 24, is reflected to the transmission surface 273 of the light splitting prism 27 by the 13.5 ° filter 23, is transmitted and output by the transmission surface 273, and the output optical signal is transmitted through the optical fiber connected to the interface 28 (or is connected to the optical fiber collimator first and then to the optical fiber). The received optical signal is transmitted through the transmission surface 273 of the beam splitter prism 27, then enters the 13.5 ° filter 23, and is transmitted through the 13.5 ° filter 23 and then received by the receiving end optical device.
In the optical path shown in fig. 5, the transmitting optical path is transmitted after being reflected for multiple times, and the receiving optical path is relatively simple and equivalent, or the receiving optical path is received by the receiving end device after being reflected for multiple times, and the transmitting optical path is relatively simple. That is, the received optical signal is transmitted through the transmission surface of the light splitting prism, then enters the 13.5-degree filter, is reflected to the reflector through the 13.5-degree filter, is reflected by the reflector and then enters the reflection surface of the light splitting prism, is reflected by the reflection surface of the light splitting prism and then enters the anti-reflection film, and is received by the receiving optical device after being transmitted through the anti-reflection film; and the optical signal of the emitting end passes through the 13.5-degree filter plate, is transmitted by the 13.5-degree filter plate, is incident to the transmission surface of the beam splitter prism, and is output after being transmitted by the transmission surface of the beam splitter prism. At this time, the positions of the light emitting device and the light receiving device are exchanged with each other.
In addition, the single-fiber bidirectional optical device provided in this embodiment not only can implement that the transmitting optical path is parallel to the receiving optical path, but also in a further optimized scheme, the transmitting optical device and the receiving optical device are packaged into a whole, as shown in fig. 6.
In conventional designs, the transmitting laser and the receiving detector are packaged as one unit, and then the two units are assembled together, only the transmitting chip and the receiving chip are airtight, and other optical components such as lenses are all airtight. In the above scheme, not only the transmitting chip and the receiving chip are packaged together into one component, but also the transmitting optical device including the optical element such as the lens and the receiving optical device are packaged into one component, so that not only can the size of the whole equipment be further reduced, but also other optical devices such as the lens and the like can be protected from being polluted by substances which are easy to vaporize.
It should be understood that the long-distance transmission single-fiber bidirectional optical device further includes a housing and a fiber collimator, and for clarity, the housing and the fiber collimator are not shown in fig. 1 to 4, and reference may be made to fig. 6, but the upper cover is not shown in fig. 6. In addition, in order to facilitate the installation, fixation and positioning of each device, the long-distance transmission single-fiber bidirectional optical device further includes some auxiliary cushion block structures, which are not labeled and described correspondingly in the figures. It will be readily understood that these omitted designations and descriptions do not affect the understanding of the structure of the present long haul single fiber bi-directional optical device.
The above-mentioned embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above description is only the embodiments of the present invention, and is not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A long-distance transmission single-fiber bidirectional optical device comprises an emitting optical device and a receiving optical device, wherein the emitting optical device comprises a laser and a first thermoelectric cooler, the laser is arranged on the first thermoelectric cooler, and the receiving optical device comprises a semiconductor optical amplifier used for carrying out signal amplification on a received optical signal.
2. The long-haul single-fiber bi-directional optical device of claim 1, wherein the receiving optical device further comprises a second thermoelectric cooler, the semiconductor optical amplifier being disposed in the second thermoelectric cooler, and the second thermoelectric cooler being disposed in the first thermoelectric cooler.
3. The long-distance transmission single-fiber bidirectional optical device according to claim 2, wherein the light emitting device further comprises a lens four, and the light signal emitted by the laser is transmitted through the lens four and then output.
4. The long-haul single-fiber bi-directional optical device of claim 3, wherein the transmit optical device further comprises a transmit end isolator disposed in the transmit optical path in front of lens four.
5. The long-distance transmission single-fiber bidirectional optical device according to claim 2, wherein the receiving optical device further comprises a first lens, the first lens is disposed in front of the semiconductor optical amplifier in the receiving optical path, and the received optical signal is transmitted through the first lens and then enters the semiconductor optical amplifier.
6. The long-distance transmission single-fiber bidirectional optical device according to claim 5, wherein the receiving optical device further comprises a second lens, the second lens is disposed in the receiving optical path behind the semiconductor optical amplifier, and an optical signal output by the semiconductor optical amplifier is incident on the second lens.
7. The long-distance transmission single-fiber bidirectional optical device according to any one of claims 1 to 6, further comprising a light splitting prism, wherein antireflection films, 13.5 ° filters and reflectors are disposed at different positions of the light splitting prism, so as to implement receiving and transmitting of optical signals through the same interface.
8. The long-distance transmission single-fiber bidirectional optical device according to claim 7, wherein the optical signal at the transmitting end is transmitted through the anti-reflection film, then enters the reflection surface of the beam splitter prism, is reflected to the reflection sheet through the reflection surface of the beam splitter prism, enters the 13.5 ° filter after being reflected by the reflection sheet, is reflected to the transmission surface of the beam splitter prism through the 13.5 ° filter, and is output after being transmitted through the transmission surface; the received optical signal is transmitted by the transmission surface of the beam splitter prism, then enters the 13.5-degree filter plate, and is received by the receiving optical device after being transmitted by the 13.5-degree filter plate.
9. The long-distance transmission single-fiber bidirectional optical device according to claim 7, wherein the received optical signal is transmitted through the transmission surface of the beam splitter prism, then enters the 13.5 ° filter, is reflected to the reflector plate through the 13.5 ° filter, enters the reflection surface of the beam splitter prism after being reflected by the reflector plate, enters the anti-reflection film after being reflected by the reflection surface of the beam splitter prism, and is received by the receiving optical device after being transmitted through the anti-reflection film; the optical signal of the transmitting end is transmitted by the 13.5-degree filter plate and the 13.5-degree filter plate, then is incident to the transmission surface of the beam splitter prism, and is output after being transmitted by the transmission surface of the beam splitter prism.
10. The long-haul single-fiber bidirectional optical device of claim 7, wherein the transmitting optical device and the receiving optical device are packaged as a single unit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202123236493 | 2021-12-22 | ||
| CN2021232364933 | 2021-12-22 |
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| CN218272814U true CN218272814U (en) | 2023-01-10 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117805972A (en) * | 2024-02-29 | 2024-04-02 | 成都光创联科技有限公司 | 50G PON optical device and wavelength division multiplexing and demultiplexing device thereof |
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2021
- 2021-12-30 CN CN202123388082.6U patent/CN218272814U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117805972A (en) * | 2024-02-29 | 2024-04-02 | 成都光创联科技有限公司 | 50G PON optical device and wavelength division multiplexing and demultiplexing device thereof |
| CN117805972B (en) * | 2024-02-29 | 2024-05-03 | 成都光创联科技有限公司 | 50G PON optical device and wavelength division multiplexing and demultiplexing device thereof |
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