TWM644758U - Passive optics-network dual system focusing device - Google Patents

Abstract

A passive optical network dual system focusing device includes a light guide unit, an optical path conversion unit and an optical transceiver unit. The light guide unit is connected to the optical fiber and is suitable for transmitting optical signals. The optical path conversion unit is connected to the light guide unit and is suitable for receiving optical signals and changing the optical path of the optical signals. It is used in the optical transceiver unit to configure dual receiving elements and dual transmitting elements, and can support simultaneous support on the same optical path. The use of two sets of communication protocol systems.

Description

Passive optical network dual system focusing device

This invention relates to an optical module, specifically a passive optical network dual-system focusing device that is used in passive optical network systems and can provide dual systems.

The increased demand for high performance and speed has led to the widespread use of fiber optics in communications. In optical communication systems, light is used to transmit data to remote locations through optical fibers in the form of light pulses rather than electrical current. Fiber optic transceivers are an important part of communication systems and can be classified according to fiber mode, transmission rate, transmission distance, wavelength and connector type. In the field of optical fiber cable communication, the optical transmission module (Transceiver) plays a role as a link between the past and the future. Its main function is to convert optical signals into electrical signals, or convert electrical signals into optical signals. One type of optical transmission module transceiver is a bidirectional transceiver (BOSA), and the main component of BOSA is a bi-directional Optical Sub-Assembly.

BOSA uses two independent wavelength channels, one for transceiver and interconnection equipment through a single fiber bundle, the transmit wavelength on one end and the receive wavelength on the other end. The wavelengths match each other. BOSA can transmit (Tx) data and receive (Rx) data at each end separately.

Generally speaking, a BOSA consists of a light emitter with features such as a laser diode, a light receiver with a light receiving source, and a light receiver that allows light of one wavelength to pass through while reflecting another wavelength. An optical filter, and an optical transmitter that can simultaneously output emitted light and input received light, and the above-mentioned components are all covered by a shell. After the Tx data passes through the optical transmitter, it is then transmitted to the optical fiber in the optical connector through the wavelength filter. The Rx data passes through the optical fiber and then is transmitted to the optical receiver through the filter.

For example, in a conventional technology, an optical transmission sub-module is provided, please refer to Figure 1. In this conventional technology, the optical transmission sub-module 1 includes an optical transmitter 11 that can output and receive light at the same time and an optical receiver 12 with a light receiving source. In other words, this structure is only suitable for one Communication protocol system. As the demand for data transmission speed increases, the old network system needs to be upgraded to a new system to handle large and fast data transmission. There is a handover period during the upgrade process, that is, during the upgrade process, there is still It is necessary to serve users who maintain the old network system and upgrade to the new network system at the same time. When the office building or transfer station requires two systems for the modem, it cannot be solved by using one modem. Therefore, improving the structure of the optical transmission sub-module to cope with the need to serve two systems at the same time has become an important issue to be considered in the field of optical fiber cable communications.

In view of the above, there are many bottlenecks in the conventional technology. This invention overcomes the above problems and proposes a practical passive optical network dual system focusing device.

One of the purposes of this creation is to provide a passive optical network dual system focusing device. This module can support the use of two communication systems at the same time, so as to solve the problem of needing to rearrange the optical fiber transmission line and replace the modem in the conventional technology.

Another purpose of this invention is to provide a passive optical network dual system focusing device. This module can install two sets of receiving elements and transmitting elements at the same time in a small space, so as to solve the problem that only one set of receiving elements can be installed in the conventional technology. and launcher issues.

In order to achieve the above purpose, this invention proposes a passive optical network dual-system focusing device. The passive optical network dual-system focusing device includes an optical guide unit, an optical path conversion unit and an optical transceiver unit. The light guiding unit is connected to an optical fiber and is suitable for transmitting at least one optical signal, and the at least one optical signal is not of a single wavelength. The light path conversion unit is connected to the light guide unit and is adapted to receive the at least one optical signal and change the light path of the at least one optical signal. The light path conversion unit is sequentially directed toward the light guide unit. It includes a first filter, a second filter, a focus adjustment lens and a third filter. The optical transceiver unit is suitable for receiving and transmitting the at least one optical signal and is suitable for two sets of communication protocol systems. The optical transceiver unit includes a first receiving component, a second receiving component, a third transmitting component and a third Four launch items. The first receiving element is arranged corresponding to the first filter. The second The receiving element is configured corresponding to the second filter. The third transmitting element is arranged corresponding to the third filter. The fourth transmitting element is arranged corresponding to the third filter. The first receiving part and the second receiving part are respectively arranged corresponding to one of the third transmitting part and the fourth transmitting part.

In an embodiment of the present invention, when the at least one optical signal is transmitted to the first filter, the incident angle of the at least one optical signal entering the first filter is between 40 degrees and 50 degrees.

In an embodiment of the present invention, when the at least one optical signal is transmitted to the second filter, the incident angle of the at least one optical signal entering the second filter is between 40 degrees and 50 degrees.

In an embodiment of the invention, when the at least one optical signal is transmitted to the third filter, the incident angle of the at least one optical signal entering the third filter is between 40 degrees and 50 degrees.

In an embodiment of the present invention, the first receiving element receives a wavelength ranging from 1575 to 1580 nm.

In an embodiment of the present invention, the second receiving element receives a wavelength ranging from 1480 to 1500 nm.

In an embodiment of the present invention, the third emitting element emits a wavelength ranging from 1300 nm to 1320 nm.

In an embodiment of the present invention, the fourth emitting element emits a wavelength ranging from 1260 nm to 1280 nm.

In an embodiment of the present invention, the difference in emission wavelength range between the third emitting element and the fourth emitting element is not greater than 60 nm.

In an embodiment of the present invention, the outer diameter of the focus adjustment lens is between 1.3mm and 2.3mm.

In an embodiment of the present invention, the length of the focus adjustment lens is between 1.1 mm and 1.7 mm.

In an embodiment of the invention, the distance from the focus adjustment lens to the optical fiber is between 2.3mm and 2.5mm.

In an embodiment of the invention, the distance from the focus adjustment lens to the third filter is between 3.5mm and 3.7mm.

In an embodiment of the present invention, the distance from the first receiving member to the first filter is between 2 mm and 2.3 mm.

In an embodiment of the present invention, the distance from the second receiving member to the second filter is between 2 mm and 2.3 mm.

In an embodiment of the invention, the distance between the third filter and at least one of the third emitting element and the fourth emitting element is between 5.5 mm and 10.6 mm.

In an embodiment of the present invention, the distance from the third filter to the third emitting element is between 2 mm and 3 mm.

In an embodiment of the invention, the distance from the third filter to the fourth emitting element is between 5 mm and 7 mm.

In an embodiment of the invention, the thickness of at least one of the first filter, the second filter and the third filter is between 0.1 mm and 0.3 mm.

In an embodiment of the invention, the focus adjustment lens adjusts the optical path of the at least one optical signal to at least one of the first receiving part, the second receiving part, the third emitting part and the fourth emitting part.

To sum up, this invention proposes a passive optical network dual system focusing device, which uses the configuration of dual receivers and dual transmitters in the optical transceiver unit to support two sets of communication protocols on the same optical path. use. In addition, by setting the angle of each filter in the optical path conversion unit, two sets of receivers and transmitters can be installed in a small space, which not only does not increase the overall occupied space, but also maintains good signal transmission effects. .

These and other components, steps, features, benefits and advantages of the present invention will now become apparent from the following detailed description of the illustrative embodiments, accompanying drawings, and patent claims.

1: Optical transmission sub-module

11: Optical transmitter

12: Optical receiver

2: Passive optical network dual system focusing device

20:Light guide unit

22:Light path conversion unit

240:First received item

242:Second receipt

244:The third launcher

246: The fourth launcher

220: First filter

222: Second filter

223: Focus adjustment lens

224: The third filter

S: light signal

9: Optical fiber

Other features and functions of this invention will be clearly presented in the implementation manner with reference to the drawings, among which:

Figure 1 is a schematic structural diagram of an optical transmission sub-module in the conventional technology;

Figure 2 is a schematic structural diagram of the passive optical network dual system focusing device of this invention;

Figure 3 is a schematic structural diagram of a cross-section of the passive optical network dual system focusing device of this invention;

Figure 4 is a schematic structural diagram of a cross-section of the passive optical network dual system focusing device of this invention including the light path.

Before this creation is described in detail, it should be noted that in the following description, similar components are represented by the same numbers. In addition, the shape, size, thickness, angle and other relevant parameters of the components in the drawings are not drawn to scale. , its simplification is only for convenience and clear explanation.

The embodiment disclosed in this case is a passive optical network dual system focusing device. For example, the passive optical network dual system focusing device can be installed in the user-side optical network unit (ONU) of the passive optical network (PON) system. This system is fiber to the curb (FTTC) or fiber to the building (FTTB). ) or fiber-to-the-home (FTTH) system, which uses point-to-multipoint network architecture and FTTC, FTTB, and FTTH systems and equipment used at remote user residences.

First, let’s describe the structural appearance and some functions of the passive optical network dual system focusing device in this case. Please refer to Figure 2, which is a schematic structural diagram of the passive optical network dual system focusing device of this invention. The passive optical network dual system focusing device 2 includes a light guide unit 20, an optical path conversion unit 22 and an optical transceiver unit. The light guide unit 20 is connected to the optical fiber 9, and the light guide unit 20 is suitable for outputting optical signals. The optical path conversion unit 22 is connected to the light guiding unit 20 and is adapted to receive optical signals and change the optical path of the optical signals. The optical transceiver unit is suitable for receiving and transmitting optical signals. The optical transceiver unit includes a first receiving member 240, a second receiving member 242, a third transmitting member 244 and a fourth transmitting member 246. The first receiving part 240 and the second receiving part 242 are respectively arranged corresponding to one of the third transmitting part 244 and the fourth transmitting part 246. In other words, the receiving part and the transmitting part are arranged in pairs, and the installation positions of the receiving part and the transmitting part in FIG. 2 are only schematic diagrams in the embodiment, and the actual installation positions are still determined according to the layout requirements.

Next, the internal structure of the passive optical network dual system focusing device of this case is further revealed through the cross-sectional view. Please refer to Figure 3. Figure 3 is a cross-sectional structural diagram of the passive optical network dual system focusing device of this invention. The passive optical network dual system focusing device 2 includes a light guide unit 20, an optical path conversion unit 22 and an optical transceiver unit. The light path conversion unit 22 is connected to the light guide unit 20 and includes a first filter 220 , a second filter 222 , a focus adjustment lens 223 , and a third filter 224 in sequence along the direction toward the light guide unit 20 . The optical transceiver unit includes a first receiving member 240, a second receiving member 242, a third transmitting member 244 and a fourth transmitting member 246. Among them, the first receiving piece 240 The second receiving part 242 is set corresponding to the second filter 220; the third transmitting part 244 is set corresponding to the third filter 224; the fourth transmitting part 246 is set corresponding to the third filter 224. .

The design positions of the above-mentioned filters, receiving parts and transmitting parts will be further explained here. It should be noted that since the devices that can install this module are usually located in relatively narrow spaces, how to achieve a good balance while simplifying the arrangement of components and reducing the overall space is the main consideration when designing the locations of the above components. . In this case, the primary consideration is whether the transmission path of the optical signal is blocked. Once the optical signal is blocked, the transmission effect will inevitably be reduced. Therefore, appropriate installation space for the receiving component and/or transmitting component must be provided. However, , the movement of any receiving part and/or transmitting part will increase the collision between components. In addition, when the receiving part and/or transmitting part is moved, the focus adjustment lens and filter inside the optical path conversion unit also need to be adjusted accordingly. In order to reduce the effect of light spots on signal transmission, the filter at the transmitting end is usually Installed near the light focusing point of the emitting element, the small spot filter can be used in a small size to save space. Therefore, the design of components in the light adjustment unit is a major challenge after careful consideration.

Under the above considerations, the detailed path of light in the light path conversion unit will be further explained here. Please continue to refer to Figure 3, and please refer to Figure 4 at the same time. Figure 4 is a cross-section of the passive optical network dual system focusing device of this invention. A structural diagram of a light path. Since the filtering wavelength of each filter is based on the receiving wavelength corresponding to the filter, It depends on the requirements of the filter and/or transmitter, so in this case, the description is only based on the perspective of each filter. The way to define the filter angle is determined by the angle at which light is incident on the filter. That is, in the passive optical network dual system focusing device 2 described in this case, when the optical signal S (dashed line) is transmitted to the first filter 220, the incident angle of the optical signal S entering the first filter 220 is 40 degrees to 45 degrees. degree; when the optical signal S is transmitted to the second filter 222, the incident angle of the optical signal S into the second filter 222 is 40 degrees to 45 degrees; when the optical signal S is transmitted to the third filter 224, the optical signal S The incident angle into the third filter 224 is 40 degrees to 45 degrees, and in this embodiment, only the incident angle of 45 degrees is shown for reference.

It should be noted that the optical signal in this case is not of a single wavelength. If the optical signal is directly transmitted to the light guide unit at different wavelengths, the optical signal may be interfered, resulting in poor reception. problem. Therefore, in the prior art, parallel light lenses are often used to make up for the above shortcomings. However, usually when using parallel light lenses, more parallel light lenses are needed to extend the focal length, and the cost of parallel light lenses is relatively high. Mass production will inevitably cost more, and when the number of internal components increases, the arrangement and design of components must be re-considered. The passive optical network dual system focusing device in this case is equipped with a focus adjustment lens. This lens can be used to adjust the optical signal sent from the optical fiber to the first receiving element, the second receiving element, the third transmitting element and the fourth transmitting element. At least one of the light path travels.

In the passive optical network dual-system focusing device in this case, the first receiving element receives a wavelength ranging from 1575nm to 1580nm. The second receiving element receives a wavelength ranging from 1480nm to 1500nm. The third emitting component emits a wavelength ranging from 1300nm to 1320nm. The fourth emitting element emits a wavelength ranging from 1260nm to 1280nm. And the difference in emission wavelength range between the third emitting element and the fourth emitting element is not greater than 60 nm.

In this case, the optical path of the at least one optical signal to at least one of the first receiving element, the second receiving element, the third emitting element and the fourth emitting element is adjusted through a focus adjustment lens. Therefore, the structure of the focus adjustment lens and the corresponding distance between the optical transceivers are critical. In this embodiment, the outer diameter of the focus adjustment lens is between 1.3mm and 2.3mm, and the length of the focus adjustment lens is between 1.1mm and 1.7mm. The distance between the focus adjustment lens and the optical fiber is between 2mm and 3mm. The distance from the focus adjustment lens to the third filter is between 3mm and 4mm. It should be noted that the distance from the focus adjustment lens to each component in this case is calculated from the center point of the focus adjustment lens. The distance to the optical fiber is the distance to the optical signal outlet, and the distance to the receiver is the distance to the top of the receiver. , the distance to the launch element is the distance to the launch path base.

In addition, the focal length system will affect the optical transmission and reception loss and is one of the basis for the arrangement of components. Therefore, the distance between each receiving element and each transmitting element and the filter is very important. In this embodiment, the distance from the first receiving element to the first filter is The separation range is between 2mm and 2.3mm. The distance between the second receiving element and the two filters is between 1.5 and 2.1 mm. The distance between the third filter and at least one of the third emitting element and the fourth emitting element is between 2 mm and 7 mm. The distance from the third filter to the third emitting element is between 2mm and 3mm. The distance from the third filter to the fourth emitting element is between 5mm and 7mm. The thickness of at least one of the first filter, the second filter and the third filter is between 0.1 mm and 0.3 mm.

Using the passive optical network dual system focusing device described in this case, the services of two communication protocol systems can be provided simultaneously in the same structure. For example, it can serve GPON (Gigabit-Capable Passive Optical network) and XGS-PON (10 Gigabit-Capable Symmetric Passive Optical network) two systems. Of course, the above communication system is only an example, and any communication system that can be applied to the passive optical network dual system focusing device in this case should not exceed the scope of this invention.

Accordingly, this creation discloses a passive optical network dual system focusing device, which has the following advantages:

1. Combining dual system components in the same module means that when you want to replace or use two communication systems at the same time, there is no need to disassemble additional hardware equipment such as modems, significantly reducing the cost of replacing the system.

2. Through the setting of the focus adjustment lens, the optical signal can be directly adjusted internally to improve the quality of the optical signal received by the receiver.

3. Through the design of the focus adjustment lens, it occupies less space and has lower cost. It not only increases the feasibility of the design arrangement of other components, greatly saves the overall space, but also reduces the problem of high component costs.

The technical content disclosed in this creation is not limited to the above-mentioned embodiments. Anything that is the same as the creative concepts and principles disclosed in this creation falls within the scope of the patent application of this creation. It should be noted that the directions of the components described in this creation, such as "up", "down", "above", "below", "horizontal", "vertical", "left", "right", etc. do not mean Absolute position and/or orientation. The definitions of components, such as “first” and “second” are not words of limitation, but terms of distinction. The "includes" or "includes" used in this case covers the concepts of "including" and "having" and indicates components, operating steps and/or groups or combinations of the above, and does not mean exclusion or addition. In addition, unless otherwise stated, the sequence of steps does not represent an absolute sequence. Furthermore, unless otherwise specified, reference to an element in the singular (eg, using the articles "a" or "an") does not mean "one and only one" but rather "one or more." As used in this case, "and/or" means "and" or "or", as well as "and" and "or". The range-related terms used in this case include all and/or range limitations, such as "at least", "greater than", "less than", "no more than", etc., which refer to the upper or lower limit of the range.

However, the above are only examples of the present invention and should not be used to limit the scope of the invention. Any patent application and patent description based on the present invention Simple equivalent changes and modifications to the contents of the book are still within the scope of this new patent.

2: Passive optical network dual system focusing device

20:Light guide unit

22:Light path conversion unit

240:First received item

242:Second receipt

244:The third launcher

246: The fourth launcher

220: First filter

222: Second filter

223: Focus adjustment lens

224: The third filter

9: Optical fiber

Claims (20)

A passive optical network dual system focusing device, including: A light guide unit connected to an optical fiber and adapted to transmit at least one optical signal, and the at least one optical signal is not of a single wavelength; An optical path conversion unit, connected to the light guide unit, is adapted to receive the at least one optical signal and change the optical path of the at least one optical signal. The optical path conversion unit is sequentially along the direction toward the light guide unit. Includes a first filter, a second filter, a focus adjustment lens, and a third filter; and An optical transceiver unit is suitable for receiving and transmitting the at least one optical signal to be applicable to two sets of communication protocol systems. The optical transceiver unit includes: a first receiving element, which is configured corresponding to the first filter; A second receiving element is provided corresponding to the second filter; a third transmitter configured corresponding to the third filter; and a fourth transmitting element, which is configured corresponding to the third filter; Wherein, the first receiving part and the second receiving part are respectively arranged corresponding to one of the third transmitting part and the fourth transmitting part. The passive optical network dual system focusing device as claimed in claim 1, wherein when the at least one optical signal is transmitted to the first filter, the incident angle of the at least one optical signal entering the first filter is between 40 degrees and 50 degrees. The passive optical network dual system focusing device as claimed in claim 1, wherein when the at least one optical signal is transmitted to the second filter, the incident angle of the at least one optical signal entering the second filter is between 40 degrees and 50 degrees. The passive optical network dual system focusing device as claimed in claim 1, wherein when the at least one optical signal is transmitted to the third filter, the incident angle of the at least one optical signal entering the third filter is between 40 degrees and 50 degrees. The passive optical network dual system focusing device as claimed in claim 1, wherein the first receiving element receives a wavelength ranging from 1575 to 1580 nm. The passive optical network dual system focusing device as claimed in claim 1, wherein the second receiving element receives a wavelength ranging from 1480 to 1500 nm. The passive optical network dual system focusing device as claimed in claim 1, wherein the third emitting element emits a wavelength ranging from 1300nm to 1320nm. The passive optical network dual system focusing device as claimed in claim 1, wherein the fourth emitting element emits a wavelength ranging from 1260nm to 1280nm. The passive optical network dual system focusing device as claimed in claim 1, wherein the difference in emission wavelength range between the third emitting element and the fourth emitting element is not greater than 60 nm. The passive optical network dual system focusing device as claimed in claim 1, wherein the outer diameter of the focus adjustment lens is between 1.3mm and 2.3mm. The passive optical network dual system focusing device as claimed in claim 1, wherein the length of the focus adjustment lens is between 1.1mm and 1.7mm. The passive optical network dual system focusing device as claimed in claim 1, wherein the distance from the focus adjustment lens to the optical fiber is between 2 mm and 3 mm. The passive optical network dual system focusing device as claimed in claim 1, wherein the distance from the focus adjustment lens to the third filter is between 3 mm and 4 mm. The passive optical network dual system focusing device as claimed in claim 1, wherein the distance from the first receiving element to the first filter is between 1.5 mm and 2.1 mm. The passive optical network dual system focusing device as claimed in claim 1, wherein the distance from the second receiving element to the second filter is between 0.9mm and 1.5mm. The passive optical network dual system focusing device as claimed in claim 1, wherein the distance from the third filter to at least one of the third emitting element and the fourth emitting element is between 2 mm and 7 mm. The passive optical network dual system focusing device as claimed in claim 1, wherein the distance from the third filter to the third emitting element is between 2 mm and 3 mm. The passive optical network dual system focusing device as claimed in claim 1, wherein the distance from the third filter to the fourth emitting element is between 5 mm and 7 mm. The passive optical network dual system focusing device according to claim 1, wherein the thickness of at least one of the first filter, the second filter and the third filter is between 0.1 mm and 0.3 mm. The passive optical network dual system focusing device as claimed in claim 1, wherein the focus adjustment lens adjusts the at least one optical signal to at least one of the first receiving element, the second receiving element, the third emitting element and the fourth emitting element. One light path travel.

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