Single-channel multi-wavelength optical device

Abstract

The utility model provides a single-channel multi-wavelength optical device, which comprises an XMD shell, and a laser, a coupling lens and a polarized beam splitter which are arranged in the XMD shell, the plurality of lasers are arranged in parallel side by side, the plurality of coupling lenses are arranged at the light emitting ends of the lasers and are arranged in one-to-one correspondence with the plurality of lasers, the polarized light beam splitters are arranged at the light emitting ends of the coupling lenses, and the polarized light beam splitters are arranged at the light emitting ends of the coupling lenses. And the light emitted by each coupling lens is coupled to the same light output channel to be output. The optical device integrates a plurality of lasers, the rate of the lasers ranges from 1.25 Gbps to 50 Gbps, meanwhile, a polarized beam splitter is designed, multi-wavelength multi-rate single-channel output is achieved, an XMD packaging shell is adopted for packaging, the size is suitable for module miniaturization packaging requirements, wave splitting and wave combining are easy, the device structure is simple, the heat dissipation performance is effectively improved, and the optical device is suitable for large-scale popularization and application. And the optical device is more convenient to use.

Description

Technical Field

[0001] The utility model belongs to the technical field of optical fiber communication, and particularly relates to an optical device with single-channel and multi-wavelengths. Background Art

[0002] 50G PON, as a new member of PON technology, has not only achieved a qualitative leap in speed, but also made remarkable breakthroughs in aspects such as bandwidth, latency, and density. First of all, the bandwidth of 50G PON is one of its most prominent features. Compared with traditional GPON and EPON technologies, the bandwidth of 50G PON is as high as 50Gbps, which provides users with unprecedented download and upload speeds. Secondly, 50G PON also has excellent performance in terms of latency. Low latency is crucial for many real-time applications, such as online video conferencing and telemedicine. 50G PON realizes lower latency by optimizing the data transmission path and reducing signal interference, providing more stable and smooth network support for these applications. In addition, 50G PON also focuses on high-density network connections. With the rapid development of emerging applications such as the Internet of Things and smart homes, users' demand for network connections is also increasing. 50G PON, through its high-density connection ability, supports more users and devices to access the network simultaneously, meeting the network requirements of these applications.

[0003] Currently, for the packaging scheme of multiple wavelength integration devices, the single-wavelength single traditional coaxial TO packaging method is mainly adopted. Although the TO base packaging method is simple, it requires a large number of TOs, resulting in a complex device structure, high difficulty in multi-wavelength splitting, and being limited by the device structure size, it is difficult to meet the module performance and size requirements. Moreover, the TO socket has a low compatibility rate, and it is difficult to reach the 50G TO base bandwidth. At the same time, the heat dissipation performance is poor, and it only supports commercial-grade applications, restricting the use of optical modules. Summary of the Utility Model

[0004] The purpose of the utility model is to provide an optical device with single-channel and multi-wavelengths, which can at least solve some defects existing in the prior art.

[0005] To achieve the above purpose, the utility model adopts the following technical solutions:

[0006] An optical device with single-channel and multi-wavelengths includes an XMD housing, and a laser, a coupling lens, and a polarization beam splitter arranged in the XMD housing; there are multiple lasers, and the multiple lasers are arranged in parallel side by side. There are multiple coupling lenses, which are arranged at the light output ends of the lasers and correspond to the multiple lasers one by one. The polarization beam splitter is arranged at the light output ends of the coupling lenses to couple the light output from each coupling lens to the same light output channel for output.

[0007] Further, an isolator is correspondingly arranged between each of the coupling lenses and the polarization beam splitter.

[0008] Further, the polarization beam splitter internally has a plurality of reflecting surfaces and a plurality of projecting surfaces for reflecting and / or transmitting the outgoing light of each of the coupling lenses and coupling the light to the same light output channel.

[0009] Further, the incident light on the polarization beam splitter is incident as parallel light, and the reflecting surface inside the polarization beam splitter is at an angle of 45°.

[0010] Further, a temperature control unit for controlling the temperature inside the XMD housing within a preset temperature range is also provided inside the XMD housing.

[0011] Further, the temperature control unit includes a temperature detection module for monitoring the temperature value of the laser, and a TEC cooler for adjusting the temperature inside the XMD housing.

[0012] Further, the above-mentioned single-channel multi-wavelength optical device further includes a ceramic pad, the ceramic pad is placed on the TEC cooler, and the laser, the coupling lens and the temperature detection module are all arranged on the ceramic pad.

[0013] Further, a backlight monitoring module for detecting the light-emitting state of each of the lasers is also provided inside the XMD housing.

[0014] Further, a plurality of signal pins connected to each of the lasers are provided at one end of the XMD housing close to the laser, and a light output port is provided at one end of the XMD housing close to the polarization beam splitter, and the light output port communicates with the light output channel on the polarization beam splitter.

[0015] Further, at least one signal pin on the XMD housing has a bandwidth greater than or equal to 35 GHz to meet the 50 Gbps transmission rate, at least one signal pin supports the 10 Gbps transmission rate, and the remaining signal pins support the 2.5 Gbps transmission rate and are downward compatible to the 1.25 Gbps transmission rate.

[0016] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0017] The single-channel multi-wavelength optical device provided by the present utility model integrates multiple lasers, and the laser rate ranges from 1.25 Gbps to 50 Gbps. At the same time, a polarization beam splitter is designed to achieve multi-wavelength multi-rate single-channel output, and it is packaged with an XMD package housing. The size meets the requirements of module miniaturization packaging, is easy to demultiplex and multiplex, the device structure is simple, and the heat dissipation performance is effectively improved, making the use of the optical device more convenient.

[0018] The present utility model will be further described in detail below in conjunction with the accompanying drawings. Description of the Drawings

[0019] Figure 1 It is a schematic structural diagram of the optical device with single-channel and multi-wavelength of the present utility model;

[0020] Figure 2 It is a schematic internal structure diagram of the optical device with single-channel and multi-wavelength of the present utility model;

[0021] Figure 3 It is a schematic longitudinal sectional view of the optical device with single-channel and multi-wavelength of the present utility model;

[0022] Figure 4 It is a schematic transverse sectional view of the optical device with single-channel and multi-wavelength of the present utility model;

[0023] Figure 5 It is a schematic diagram of the optical wave transmission path in the optical device with single-channel and multi-wavelength of the present utility model.

[0024] Description of the reference numerals in the drawings: 1. XMD housing; 2. Signal pin; 3. Light output port; 4. Laser; 5. Coupling lens; 6. Isolator; 7. Polarizing beam splitter; 8. TEC cooler; 9. Ceramic spacer; 10. Temperature detection module; 11. Backlight monitoring module. Detailed Embodiment

[0025] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0026] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present utility model.

[0027] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or a contact connection or an integral connection; for those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0028] The terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features; in the description of the present utility model, unless otherwise stated, "a plurality" and "several" mean two or more.

[0029] As Figures 1 to 5 shown, this embodiment provides a single-channel multi-wavelength optical device, including an XMD housing 1, and a laser 4, a coupling lens 5, and a polarization beam splitter 7 disposed in the XMD housing 1; there are a plurality of lasers 4, and the plurality of lasers 4 are arranged in parallel side by side. There are a plurality of coupling lenses 5, which are disposed at the light output end of the laser 4 and are arranged in one-to-one correspondence with the plurality of lasers 4. The polarization beam splitter 7 is disposed at the light output end of the coupling lens 5 to couple the light emitted from each coupling lens 5 to the same light output channel for output.

[0030] Among them, the laser 4 emits light waves under the action of an external controller. The types of the plurality of lasers 4 can be respectively but not limited to DFB, EML, SOA lasers, or a combination thereof, and the wavelengths emitted by each laser 4 can be the same wavelength or different wavelengths. The rates of each laser 4 can be the same or different, and the rate of the laser 4 is 1.25 Gbps to 50 Gbps. Optionally, the number of lasers 4 in this embodiment is 1 to 8.

[0031] The coupling lens 5 is used to couple and output light with the laser 4, so that the light waves emitted by the laser 4 are output in the form of parallel light or convergent light and output to the same optical axis. The coupling lens 5 is one or more of an aspherical lens, a Clens, or a spherical lens.

[0032] The polarization beam splitter 7 (i.e., PBS) couples the collimated light emitted by multiple lasers 4 and coupled by the coupling lens 5 into the same optical output channel and outputs it in the form of parallel light. The light waves after being coupled by the coupling lens 5 from multiple lasers 4 are respectively incident on different parts of the PBS. The polarization beam splitter 7 has several reflecting surfaces and several transmitting surfaces inside. The light waves incident on different parts of the PBS are coupled into the same optical output channel after being reflected by the reflecting surfaces or transmitted by the transmitting surfaces inside the PBS, thus realizing the single-channel output of light waves. In some embodiments, the incident light on the polarization beam splitter 7 is incident as parallel light, and the reflecting surfaces inside the polarization beam splitter 7 are at a 45° angle.

[0033] As a specific implementation manner, the XMD housing 1 is an optical communication device housing, which is a metal wall-ceramic insulator structure, provides an electrical signal transmission channel and an optical coupling interface for internal devices, provides mechanical support and airtight protection, and solves the interconnection between internal devices and external circuits. In this embodiment, a plurality of signal pins 2 connected to each of the lasers 4 are provided at one end of the XMD housing 1 close to the lasers 4. Each laser 4 is connected to an external controller through the signal pins 2 and emits light waves under the action of the external controller. At least one of the signal pins 2 has a bandwidth greater than or equal to 35 GHz to meet the 50 Gbps transmission rate, at least one signal pin 2 supports the 10 Gbps transmission rate, and the remaining signal pins 2 support the 2.5 Gbps transmission rate and are downward compatible to the 1.25 Gbps transmission rate; an optical output port 3 is provided at one end of the XMD housing 1 close to the polarization beam splitter 7, and the optical output port 3 communicates with the optical output channel on the polarization beam splitter 7.

[0034] In an optimized implementation manner, an isolator 6 is correspondingly provided between each of the coupling lenses 5 and the polarization beam splitter 7 to isolate the reflected light and improve the performance of the emitted light. Different isolators 6 are correspondingly provided for light waves of different wavelengths. The plurality of isolators 6 can be an integrated structure or a split structure. In this embodiment, an integrated isolator 6 is adopted.

[0035] Optimized implementation method. A temperature control unit is further provided inside the XMD housing 1 for controlling the internal temperature of the XMD housing 1 within a preset temperature range to stabilize the wavelength of the light wave. Specifically, the temperature control unit includes a temperature detection module 10 and a TEC cooler 8. The temperature detection module 10 is used to monitor the temperature value of the laser inside the XMD housing 1 to stabilize the wavelength. During installation, the temperature detection module is placed near the laser and as close to the laser as possible to ensure the accuracy of detection. The temperature detection module 10 can be, but is not limited to, a thermistor. The TEC cooler 8 is used to adjust the temperature according to the temperature value detected by the temperature detection module 10 so that the temperature of the laser inside the XMD housing 1 is within the preset temperature range to stabilize the wavelength of the light wave emitted by the laser.

[0036] Furthermore, the single-channel multi-wavelength optical device of this embodiment further includes a ceramic spacer 9. The ceramic spacer 9 is placed on the TEC cooler 8, and the laser 4, the coupling lens 5, and the temperature detection module 10 are all arranged on the ceramic spacer 9. Ceramic materials have strong thermal conductivity, and the provided XMD housing 1 also has strong thermal conductivity. When the laser 4, the coupling lens 5, and the temperature detection module 10 generate more heat during operation, causing the temperature in the optical device to be relatively high, the heat can be dissipated successively through the ceramic spacer 9, the TEC cooler 8, and the XMD housing 1. Compared with the TO base packaging method, the single-channel multi-wavelength optical device of this embodiment provides a larger heat dissipation area and has a higher heat dissipation effect. Moreover, the single-channel multi-wavelength optical device of this embodiment still maintains a small-volume packaging form, enabling it to be integrated into a standard module, improving the convenience of use.

[0037] Preferably, a backlight monitoring module 11 is further provided inside the XMD housing 1 for detecting whether the light-emitting states of the lasers 4 are normal and for controlling the light output stability of each laser 4 in real time according to the backlight change situation. Optionally, the backlight monitoring module 11 can also be arranged on the ceramic spacer 9 for heat dissipation.

[0038] The following uses a specific embodiment to illustrate the structure and optical path of the single-channel multi-wavelength optical device of the present invention. As Figure 5 shown, three lasers 4, three coupling lenses 5, an isolator 6, a PBS, a backlight monitoring module 11, and a temperature control unit are arranged inside the XMD housing 1. Among them, the three lasers 4 are a 1342nm 50G SOA+EML laser, a 1490nm 1.25G DFB laser, and a 1577nm 10G EML laser respectively. That is, the optical device of this embodiment has the triple functions of an SOA+EML laser chip, an EML laser chip, and a DFB laser chip. The operating rates of the three lasers 4 include, but are not limited to, 50Gbps / 1.25Gbps / 10Gbps.

[0039] A coupling lens 5 is provided at the emission end of each laser 4. The coupling lens 5 is used to couple and output light with the laser under the action of an external controller, so that the light wave is output in the form of parallel light and output into the same optical axis. An isolator 6 is provided at the rear end of each coupling lens 5, corresponding to three different wavelengths respectively, to isolate the reflected light.

[0040] The parallel light waves coupled by the laser 4 are respectively incident on different parts of the PBS. As Figure 5 shown, from top to bottom, the first reflection surface inside the PBS is a 45° surface, reflecting the light wave with a wavelength of 1342 nm downward; the second reflection surface is a 45° surface, reflecting the light wave with a wavelength of 1490 nm downward and transmitting the light wave with a wavelength of 1342 nm; the third reflection surface is a 45° surface, reflecting the light wave with a wavelength of 1577 nm downward and transmitting the light waves with wavelengths of 1342 nm / 1490 nm. Thus, the light with different wavelengths emitted by the three lasers 4 is coupled into the same light output channel.

[0041] The backlight monitoring module 11 is used to detect the light emission states of the three lasers 4, judge whether the lasers 4 emit light normally, and send an abnormal reminder to the external controller if the light emission state of the lasers 4 is abnormal; the backlight monitoring module 11 can be arranged at the rear end of the lasers 4. The temperature control unit is used to control the temperature inside the optical device, so that the temperature value of the optical device is within a preset temperature range to stabilize the wavelength of the light wave, and can also realize the heat dissipation inside the optical device.

[0042] In summary, the single-channel multi-wavelength optical device provided by the present invention integrates multiple lasers, and the laser rate ranges from 1.25 Gbps to 50 Gbps. At the same time, a polarization beam splitter is designed to realize the single-channel output of multiple wavelengths and multiple rates. And it is packaged with an XMD package housing, and the size meets the requirements of miniaturized module packaging. It is easy to demultiplex and multiplex, the device structure is simple, and the heat dissipation performance is effectively improved, making the use of the optical device more convenient.

[0043] The above examples are only illustrative of the present invention and do not constitute a limitation on the protection scope of the present invention. Any design identical or similar to the present invention falls within the protection scope of the present invention.

Claims

1. A single-channel multi-wavelength optical device, characterized in that: It includes an XMD housing, and a laser, a coupling lens and a polarization beam splitter arranged in the XMD housing; There are multiple lasers, and the multiple lasers are arranged in parallel and side by side. There are multiple coupling lenses, which are arranged at the light output ends of the lasers and are arranged one-to-one corresponding to the multiple lasers. The polarization beam splitter is arranged at the light output end of the coupling lens to couple the light output from each coupling lens to the same optical output channel for output.

2. The single-channel multi-wavelength optical device according to claim 1, characterized in that: An isolator is correspondingly arranged between each coupling lens and the polarization beam splitter.

3. The single-channel multi-wavelength optical device according to claim 1, characterized in that: The polarization beam splitter has a plurality of reflection surfaces and a plurality of projection surfaces inside thereof for reflecting and / or transmitting the output light of each coupling lens so as to couple the light to the same light output channel.

4. The single-channel multi-wavelength optical device according to claim 3, characterized in that: The incident light on the polarization beam splitter is parallel light, and the reflection surface inside the polarization beam splitter is at an angle of 45°.

5. The single-channel multi-wavelength optical device according to claim 1, characterized in that: The XMD housing is also provided with a temperature control unit for controlling the internal temperature of the XMD housing to be within a preset temperature range.

6. The single-channel multi-wavelength optical device according to claim 5, characterized in that: The temperature control unit includes a temperature detection module for monitoring the temperature value of the laser, and a TEC cooler for adjusting the temperature inside the XMD housing.

7. The single-channel multi-wavelength optical device according to claim 6, characterized in that: It also includes a ceramic pad, which is placed on the TEC cooler. The laser, coupling lens and temperature detection module are all arranged on the ceramic pad.

8. The single-channel multi-wavelength optical device according to claim 1, characterized in that: A backlight monitoring module for detecting the light-emitting state of each of the lasers is also arranged in the XMD housing.

9. The single-channel multi-wavelength optical device according to claim 1, characterized in that: A plurality of signal pins connected to the lasers are arranged on one end of the XMD housing close to the lasers, and a light outlet is arranged on one end of the XMD housing close to the polarization beam splitter, and the light outlet is communicated with the light output channel on the polarization beam splitter.

10. The single-channel multi-wavelength optical device according to claim 9, characterized in that: At least one signal pin on the XMD housing has a bandwidth greater than or equal to 35 GHz, meeting a 50 Gbps transmission rate, at least one signal pin supports a 10 Gbps transmission rate, and the remaining signal pins support a 2.5 Gbps transmission rate and are downwardly compatible to a 1.25 Gbps transmission rate.

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