A QSFP Bidi optical device for enterprise networks and its enterprise network optical communication system
By employing different wavelengths of TX and RX in QSFP Bidi optical devices, and replacing expensive optical circulators with narrowband filters and reflective prisms, the interference and packaging challenges caused by the same TX and RX wavelengths are solved, resulting in cost reduction and performance improvement.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 武汉钧恒科技有限公司
- Filing Date
- 2025-06-17
- Publication Date
- 2026-05-29
AI Technical Summary
In existing QSFP Bidi optical devices, the wavelengths at the TX and RX ends are the same, which makes the optical circulator expensive and causes the reflected light from the end face to directly reach the RX end, resulting in interference and performance degradation, and making it difficult to package into a module.
The design employs a method where the emitted light wavelength at the TX end is different from and does not overlap with the received light wavelength at the RX end. Narrowband filters and reflective prisms are used instead of optical circulators. The emitted light at the TX end passes through the narrowband filter, and the received light at the RX end is totally internally reflected and coupled into the RX fiber through the reflective prism.
It reduces costs, improves performance, avoids the TX light reflected from the end face of the PD chip reaching the RX end, simplifies the packaging process, and reduces optical insertion loss.
Smart Images
Figure CN224305769U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of optical communication technology, specifically to a QSFP Bidi optical device for enterprise networks and its enterprise network optical communication system. Background Technology
[0002] In current enterprise networks, to expand capacity, the headquarters typically uses QSFP Bidi optical devices (Bidi means that TX and RX share a single fiber, i.e., single-fiber bidirectional), while branch offices use multiple SFP optical devices. Taking four SFP optical devices as an example, the four wavelengths used at the TX end of the current QSFP Bidi optical device are the same as the four wavelengths used at the RX end. For example, the four wavelengths used at the TX end are 1270nm, 1290nm, 1310nm, and 1330nm, and the four wavelengths used at the RX end are also 1270nm, 1290nm, 1310nm, and 1330nm. The TX end includes a TX Z-block assembly, with each of the four input ports of the TX Z-block assembly coupled to a collimating lens. The input surface of each collimating lens is coupled to a laser chip, and each laser chip has a different wavelength. The output port of the TX Z-block assembly is coupled sequentially along the light propagation direction to an optical isolator, a first collimator, and the TX fiber. The RX end includes an RX Z-block assembly, RX... The Z-block component is fixed on the substrate. The light inlet of the RX Z-block component is coupled to a second collimator, which is coupled to the RX fiber. The four light outlets of the RX Z-block component are coupled to an array lens, which is coupled to a mirror fixed on the substrate. The array lens is fixed on the light inlet surface of the mirror. A PD chip coupled to the reflective surface is arranged below the mirror.
[0003] The TX fiber at the TX end connects to the TX port of the optical circulator, and the RX fiber at the RX end connects to the RX port of the optical circulator. The optical circulator is coupled to the LC adapter via fiber, and the LC adapter is coupled to the optical splitter via a single-fiber bidirectional fiber. The optical splitter is then coupled to each SFP optical device. The specific structure is as follows: Figure 1As shown; the receiving wavelength of an SFP optical device can be 1290nm, and the emitting wavelength can be 1270nm; the receiving wavelength of an SFP optical device can be 1270nm, and the emitting wavelength can be 1290nm; the receiving wavelength of an SFP optical device can be 1330nm, and the emitting wavelength can be 1310nm; the receiving wavelength of an SFP optical device can be 1310nm, and the emitting wavelength can be 1330nm; because optical circulators are very expensive, and the reflected light from the end face will directly reach the RX end (because the wavelength of the TX and RX of QSFP+ is the same, the RX filter cannot filter out the reflected light), interference will occur, and performance will degrade. The TX port and RX port of the optical circulator are on different sides and are 90° apart, making it difficult to encapsulate into a module (the RX fiber is bent at 90° and the minimum bending radius of the fiber is greater than 5mm. If the bending radius is too small, the performance will degrade). Utility Model Content
[0004] The technical problem to be solved by this utility model is to provide a QSFP Bidi optical device for enterprise networks and its enterprise network optical communication system, so as to overcome the shortcomings of the prior art.
[0005] The technical solution of this utility model to solve the above-mentioned technical problems is as follows:
[0006] A QSFP Bidi optical device for enterprise networks includes: a TX end, an RX end, and an LC adapter. The wavelength range of the emitted light at the TX end is different from and does not overlap with the wavelength range of the received light at the RX end. A tilted narrowband filter is coupled between the TX fiber at the TX end and the LC adapter, and a reflecting prism is coupled between the RX fiber at the RX end and the narrowband filter. The narrowband filter transmits the emitted light from the TX end. The narrowband filter performs total internal reflection on the received light emitted from the LC adapter and couples the received light into the RX fiber at the RX end after reflection by the reflecting prism.
[0007] The beneficial effects of this invention are: the wavelength range of the emitted light at the TX end is different from and does not overlap with the wavelength range of the received light at the RX end, so that an inexpensive narrowband filter + reflecting prism can be used to replace the expensive optical circulator, effectively reducing costs. Since the TX and RX wavelengths are different, and the narrowband filter can filter out light of different wavelengths, the end face reflection of the TX light cannot reach the PD chip at the RX end, effectively improving performance. In addition, the RX fiber does not need to be bent at 90°, making it easy to package into the module. The optical insertion loss of the narrowband filter + reflecting prism combination is also lower than that of the optical circulator.
[0008] Based on the above technical solution, the present invention can be further improved as follows.
[0009] Furthermore, the narrowband filter is distributed parallel to the reflecting prism, and the tilt angle of the narrowband filter is 45°.
[0010] Furthermore, the TX fiber at the TX end is coupled to a narrowband filter via a third collimator.
[0011] Furthermore, the RX fiber at the RX end is coupled to the reflecting prism via a fourth collimator.
[0012] Furthermore, the narrowband filter is distributed parallel to the reflecting prism, and the tilt angle of the narrowband filter is 45°.
[0013] Furthermore, the narrowband filter is coupled to the LC adapter via a fifth collimator, which is fixed inside the LC adapter.
[0014] Furthermore, the TX end includes: a TX Z-block assembly, each light inlet of the TX Z-block assembly is coupled to a collimating lens, each light inlet surface of the collimating lens is coupled to a laser chip, each laser chip has a different wavelength, and the light outlet of the TX Z-block assembly is coupled sequentially to an optical isolator, a first collimator and a TX fiber along the light propagation direction.
[0015] Furthermore, the RX end includes: an RX Z-block component, which is fixed on the substrate. The light inlet of the RX Z-block component is coupled to a second collimator, which is coupled to an RX fiber. Multiple light outlets of the RX Z-block component are coupled to an array lens, which is coupled to a reflector fixed on the substrate. The array lens is fixed on the light inlet surface of the reflector. A PD chip coupled to the reflector surface is arranged below the reflector.
[0016] Furthermore, the wavelength range of the emitted light at the TX end is 1265nm to 1335nm, and the wavelength range of the received light at the RX end is 1345nm to 1415nm.
[0017] Furthermore, the TX end has four laser chips, with emission wavelengths of 1270nm, 1290nm, 1310nm and 1330nm respectively, and the receiving wavelengths of each channel of the PD chip are 1350nm, 1370nm, 1390nm and 1410nm respectively.
[0018] Based on the above technical solution, this utility model also provides an enterprise network optical communication system, including: an optical splitter, multiple SFP optical devices with different wavelengths and QSFP Bidi optical devices, wherein the LC adapter in the QSFP Bidi optical device is coupled to the optical splitter via a single-fiber bidirectional optical fiber, and the optical splitter is coupled to multiple SFP optical devices respectively.
[0019] The further beneficial effects of adopting the above are that the QSFP Bidi optical device can reduce the cost of enterprise network optical communication systems and improve the performance of enterprise network optical communication systems. Attached Figure Description
[0020] Figure 1 This is a structural diagram of an enterprise network optical communication system in the existing technology;
[0021] Figure 2 This is a structural diagram of the QSFP Bidi optical device used in enterprise networks according to this utility model;
[0022] Figure 3 This is a structural diagram of the enterprise network optical communication system of this utility model.
[0023] The attached diagram lists the components represented by each number as follows:
[0024] 1. TX end: 110. TX fiber; 120. TX Z-block assembly; 130. Collimating lens; 140. Laser chip; 150. Optical isolator; 160. First collimator; 2. RX end: 210. RX fiber; 220. RX Z-block assembly; 230. Substrate; 240. Second collimator; 250. Array lens; 260. Mirror; 270. PD chip; 3. LC adapter; 4. Narrowband filter; 5. Reflecting prism; 6. Third collimator; 7. Fourth collimator; 8. Fifth collimator; 9. Optical splitter; 10. SFP optical device; 11. Single-fiber bidirectional fiber. Detailed Implementation
[0025] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.
[0026] Example 1
[0027] like Figure 2As shown, a QSFP Bidi optical device for enterprise networks includes: a TX (transmitter) end 1, an RX (receiver) end 2, and an LC adapter 3. The wavelength range of the emitted light from the TX end 1 is different from and does not overlap with the wavelength range of the received light from the RX end 2, that is, the emitted light wavelength and the received light wavelength are different. A narrowband filter 4 with an oblique distribution is coupled between the TX fiber 110 of the TX end 1 and the LC adapter 3. A reflecting prism 5 is coupled between the RX fiber 210 of the RX end 2 and the narrowband filter 4. The narrowband filter 4 transmits the emitted light from the TX end 1, while the narrowband filter 4 performs total internal reflection of the received light emitted from the LC adapter 3, and allows the received light to be coupled into the RX fiber 210 of the RX end 2 after being reflected by the reflecting prism 5. That is, the narrowband filter 4 does not transmit the received light emitted from the LC adapter 3.
[0028] By ensuring that the wavelength range of the emitted light at TX end 1 is different from and does not overlap with the wavelength range of the received light at RX end 2, a cheaper narrowband filter + reflecting prism can be used instead of an expensive optical circulator, effectively reducing costs. Since the TX and RX wavelengths are different, and the narrowband filter 4 can filter out light of different wavelengths, the end face reflection of the TX light cannot reach the PD chip 270 at RX end 2, effectively improving performance. In addition, the RX fiber 210 does not need to be bent at 90°, making it easier to package into the module. The optical insertion loss of the narrowband filter + reflecting prism combination is also lower than that of the optical circulator.
[0029] Example 2
[0030] like Figure 2 As shown, this embodiment is a further improvement on embodiment 1, as detailed below:
[0031] The narrowband filter 4 and the reflecting prism 5 are distributed in parallel. The tilt angle of the narrowband filter 4 is 45°, which means that the tilt angle of the reflecting prism 5 is also 45°.
[0032] Furthermore, the TX fiber 110 of TX end 1 is coupled to the narrowband filter 4 via the third collimator 6. That is, the emitted light from TX end 1 is first coupled into the third collimator 6, and then coupled to the narrowband filter 4 via the third collimator 6.
[0033] The RX fiber 210 of RX end 2 is coupled to the reflecting prism 5 via the fourth collimator 7. The received light emitted from the LC adapter 3 is first totally reflected by the narrow-band filter 4 to the reflecting prism 5, and then coupled into the fourth collimator 7 after being reflected by the reflecting prism 5. Finally, it is coupled into the RX fiber 210 of RX end 2 via the fourth collimator 7. The third collimator 6 and the fourth collimator 7 are arranged side by side and parallel.
[0034] Narrowband filter 4 is coupled to LC adapter 3 via fifth collimator 8, which is fixed inside LC adapter 3. For the emitted light from TX end 1, the emitted light from TX end 1 is transmitted through narrowband filter 4 and coupled into fifth collimator 8, and then coupled into LC adapter 3 via fifth collimator 8. For the received light from RX end 2, the received light emitted from LC adapter 3 is first coupled into fifth collimator 8, and then coupled to narrowband filter 4 via fifth collimator 8. Narrowband filter 4 totally reflects the received light toward reflecting prism 5.
[0035] The purpose of introducing the third collimator 6, the fourth collimator 7, and the fifth collimator 8 is to couple the light into parallel light, so as to maximize the wavelength division function of the 45° narrowband filter 4 and minimize the coupling insertion loss between the collimators.
[0036] Example 3
[0037] like Figure 2 As shown, this embodiment is a further improvement on embodiment 1 or 2, as detailed below:
[0038] TX end 1 includes: a TX Z-block assembly 120. The Z-block assembly is a conventional technology, so its working principle will not be described in detail here. Each light inlet of the TX Z-block assembly 120 is coupled to a collimating lens 130. For example, with... Figure 2 Taking the structure shown as an example, the TX Z-block component 120 has four light inlets, and therefore four collimating lenses 130. The light inlet surface of each collimating lens 130 is coupled to a laser chip 140. Each laser chip 140 has a different wavelength. The light outlet of the TX Z-block component 120 is coupled sequentially to an optical isolator 150, a first collimator 160, and a TX fiber 110 along the light propagation direction. The emitted light from multiple laser chips 140 is coupled into the TX Z-block component 120 through a collimating lens 130, and then combined into a single path by the TX Z-block component 120. The emitted light from the Z-block component 120 is sequentially coupled into the optical isolator 150, the first collimator 160, the TX fiber 110, and the third collimator 6. It is then coupled to the narrowband filter 4 via the third collimator 6. The narrowband filter 4 transmits the emitted light, thereby allowing it to be coupled into the fifth collimator 8. Finally, it is coupled into the LC adapter 3 via the fifth collimator 8.
[0039] RX end 2 includes: an RX Z-block assembly 220, which is fixed on substrate 230. The input port of the RX Z-block assembly 220 is coupled to a second collimator 240, which is coupled to an RX fiber 210. Multiple light output ports of the Z-block component 220 are coupled to an array lens 250, which is coupled to a reflector 260 fixed on the substrate 230. The array lens 250 is fixed on the light incident surface of the reflector 260. A PD chip 270 coupled to the reflector surface is arranged below the reflector 260. The received light emitted from the LC adapter 3 is first coupled into the fifth collimator 8, and then coupled into the narrowband filter 4. The narrowband filter 4 reflects the received light into the reflecting prism 5. The reflecting prism 5 reflects the received light into the fourth collimator 7, and then coupled into the RX Z-block component 220 through the RX fiber 210 and the second collimator 240. The RX Z-block component 220 then splits the received light into multiple wavelengths, and coupled into multiple corresponding channels of the PD chip 270 through the array lens 250 and the reflector 260, respectively.
[0040] Example 4
[0041] like Figure 2 As shown, this embodiment is a further improvement on any one of embodiments 1 to 3, as detailed below:
[0042] The wavelength range of the emitted light at TX end 1 can be 1265nm to 1335nm, and the wavelength range of the received light at RX end 2 can be 1345nm to 1415nm. Of course, this is just an example, and other wavelength ranges may be used in actual applications.
[0043] Furthermore, the TX terminal 1 has four laser chips 140, and the emission wavelengths of the four laser chips 140 can be 1270nm, 1290nm, 1310nm and 1330nm respectively, while the receiving wavelengths of each channel of the PD chip 270 are 1350nm, 1370nm, 1390nm and 1410nm respectively.
[0044] Example 5
[0045] like Figure 3As shown, an enterprise network optical communication system includes: an optical splitter 9, multiple SFP optical devices 10 with different wavelengths, and a QSFP Bidi optical device as described in any of embodiments 1 to 4. The LC adapter 3 in the QSFP Bidi optical device is coupled to the optical splitter 9 via a single-fiber bidirectional optical fiber 11. The optical splitter 9 is coupled to multiple SFP optical devices 10. Each SFP optical device 10 can both receive and transmit light, and the received and transmitted light wavelengths are different. For example: the received light wavelength of the SFP optical device 10 can be 1270nm, and the transmitted light wavelength can be 1350nm; the received light wavelength of the SFP optical device 10 can be 1290nm, and the transmitted light wavelength can be 1370nm; the received light wavelength of the SFP optical device 10 can be 1310nm, and the transmitted light wavelength can be 1390nm; the received light wavelength of the SFP optical device 10 can be 1330nm, and the transmitted light wavelength can be 1410nm.
[0046] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.
Claims
1. A QSFP Bidi optical device for enterprise networks, characterized in that, include: The TX end (1), RX end (2), and LC adapter (3) have different and non-overlapping wavelength ranges for the emitted light from the TX end (1) and the received light from the RX end (2). A narrowband filter (4) with an inclined distribution is coupled between the TX fiber (110) of the TX end (1) and the LC adapter (3). A reflective prism (5) is coupled between the RX fiber (210) of the RX end (2) and the narrowband filter (4). The narrowband filter (4) transmits the emitted light from the TX end (1). The narrowband filter (4) performs total internal reflection on the received light emitted from the LC adapter (3) and couples the received light into the RX fiber (210) of the RX end (2) after reflection by the reflective prism (5).
2. The QSFP Bidi optical device for enterprise networks according to claim 1, characterized in that, The narrowband filter (4) is distributed parallel to the reflective prism (5), and the tilt angle of the narrowband filter (4) is 45°.
3. A QSFP Bidi optical device for enterprise networks according to claim 2, characterized in that, The TX fiber (110) of the TX end (1) is coupled to the narrowband filter (4) via the third collimator (6).
4. A QSFP Bidi optical device for enterprise networks according to claim 2, characterized in that, The RX fiber (210) of the RX end (2) is coupled to the reflecting prism (5) via the fourth collimator (7).
5. A QSFP Bidi optical device for enterprise networks according to claim 2, characterized in that, The narrowband filter (4) is coupled to the LC adapter (3) via the fifth collimator (8), which is fixed inside the LC adapter (3).
6. A QSFP Bidi optical device for enterprise networks according to any one of claims 1 to 5, characterized in that, The TX end (1) includes: a TX Z-block assembly (120), each light inlet of the TX Z-block assembly (120) is coupled to a collimating lens (130), the light inlet surface of each collimating lens (130) is coupled to a laser chip (140), each laser chip (140) has a different wavelength, and the light outlet of the TX Z-block assembly (120) is coupled to an optical isolator (150), a first collimator (160) and a TX fiber (110) in sequence along the light propagation direction.
7. A QSFP Bidi optical device for enterprise networks according to claim 6, characterized in that, The RX end (2) includes: an RX Z-block assembly (220), which is fixed on a substrate (230). The light inlet of the RX Z-block assembly (220) is coupled to a second collimator (240), which is coupled to an RX fiber (210). Multiple light outlets of the RX Z-block assembly (220) are coupled to an array lens (250), which is coupled to a reflector (260) fixed on the substrate (230). The array lens (250) is fixed on the light inlet surface of the reflector (260), and a PD chip (270) coupled to its reflective surface is arranged below the reflector (260).
8. A QSFP Bidi optical device for enterprise networks according to claim 7, characterized in that, The wavelength range of the emitted light from the TX end (1) is 1265nm to 1335nm, and the wavelength range of the received light from the RX end (2) is 1345nm to 1415nm.
9. A QSFP Bidi optical device for enterprise networks according to claim 8, characterized in that, The TX terminal (1) has four laser chips (140), and the emission wavelengths of the four laser chips (140) are 1270nm, 1290nm, 1310nm and 1330nm respectively. The receiving wavelengths of each channel of the PD chip (270) are 1350nm, 1370nm, 1390nm and 1410nm respectively.
10. An enterprise network optical communication system, characterized in that, include: The optical splitter (9), multiple SFP optical devices (10) with different wavelengths, and the QSFP Bidi optical device as described in any one of claims 1 to 9, wherein the LC adapter (3) in the QSFP Bidi optical device is coupled to the optical splitter (9) via a single-fiber bidirectional optical fiber (11), and the optical splitter (9) is coupled to multiple SFP optical devices (10) respectively.