CN216646888U

CN216646888U - Passive optical network dual-system module

Info

Publication number: CN216646888U
Application number: CN202122737352.3U
Authority: CN
Inventors: 吴锦宗
Original assignee: EZconn Corp
Current assignee: EZconn Corp
Priority date: 2021-11-10
Filing date: 2021-11-10
Publication date: 2022-05-31
Anticipated expiration: 2031-11-10

Abstract

A passive optical network dual-system module comprises an optical guide unit, an optical path conversion unit and an optical transceiver unit. The optical guiding unit is connected to the optical fiber and is used for transmitting optical signals. The optical path conversion unit is connected with the optical guiding unit and used for receiving the optical signal and changing the optical path of the optical signal, the configuration of the two receiving parts and the two transmitting parts is carried out in the optical transceiving unit, and the use of two groups of communication protocol systems can be simultaneously supported on the same optical path.

Description

Passive optical network dual-system module

Technical Field

The present invention relates to an optical module, and more particularly, to a passive optical network dual-system module applied to a passive optical network system and capable of providing dual-system common use.

Background

As the demand for high performance and speed increases, the use of optical fibers in communications has become more widespread. In optical communication systems, light is used to transmit data to a remote location in the form of optical pulses rather than electrical current through optical fibers. Fiber optic transceivers are an important component of communication systems and can be classified according to fiber optic mode, transmission rate, transmission distance, wavelength, and connector type. In the field of fiber optic cable communications, a Transceiver has a role of starting before and after, and its main function is to convert an optical signal into an electrical signal, or convert an electrical signal into an optical signal. One type of Optical transmission module transceiver is a bi-directional transceiver (BiDi), while the main component of the BOSA is a bi-directional Optical Sub-Assembly (bi-directional Optical Sub-Assembly).

BOSA uses two independent wavelength channels, one for transceiving to and from the interconnect device through a single fiber bundle, with the transmit wavelength at one end matched to the receive wavelength at the other end. BOSA may transmit (Tx) data and receive (Rx) data separately on each end.

In general, BOSA is composed of a light transmitter having, for example, a laser diode, a light receiver having a light receiving source, an optical filter that allows light of one wavelength to pass therethrough while reflecting light of another wavelength, and an optical transmitter that outputs the emitted light and inputs the received light simultaneously, and the above components are enclosed by a case. The Tx data is transmitted to the optical fiber in the optical connector through the wavelength filter after passing through the optical transmitter, and the Rx data is transmitted to the optical receiver through the optical fiber after passing through the filter.

For example, in a prior art, an optical transmission sub-module is provided, please refer to fig. 1. In the prior art, the photonic transmission sub-module 1 includes an optical transmitter 11 and an optical receiver 12, which can output and receive light simultaneously, i.e. the structure is suitable for a system with only one communication protocol. As the demand for data transmission speed increases, the old network system needs to be upgraded to the new system to load a large amount of data transmission quickly, and there is a handover period during the upgrade process, that is, during the upgrade process, the user who maintains the old network system and upgrades to the new network system still needs to be served simultaneously. When there are two kinds of modem requirements for office buildings or transfer stations, it is impossible to uniformly use one modem for the solution. Therefore, it is an important issue to consider in the field of optical fiber cable communication to improve the structure of the optical transmission sub-module to deal with the situation where two systems need to be serviced simultaneously.

In view of the above, the present invention provides a practical passive optical network dual system module to overcome the above problems.

SUMMERY OF THE UTILITY MODEL

An objective of the present invention is to provide a passive optical network dual system module, which can support the use of two communication systems simultaneously, so as to solve the problem of the prior art that the optical fiber transmission line needs to be rearranged and the modem needs to be replaced.

Another objective of the present invention is to provide a passive optical network dual system module, which can install two sets of receiving devices and emitting devices in a narrow space, so as to solve the problem that only one set of receiving device and emitting device can be installed in the prior art.

In order to achieve the above object, the present invention provides a passive optical network dual-system module, which includes an optical guiding unit, an optical path converting unit, and an optical transceiver unit. The optical guide unit is connected to an optical fiber and is used for transmitting an optical signal, and the optical signal is a non-single wavelength. Wherein the light guide unit is connected to the light path conversion unit for receiving the light signal and changing the light path of light signal, the light path conversion unit contains a first collimating lens, a first filter, a second collimating lens and a third filter, a fourth filter along the orientation in proper order in the direction of light guide unit, wherein first collimating lens set up in the light guide unit reaches between the light path conversion unit, second collimating lens set up in the second filter reaches between the third filter, wherein first collimating lens reaches second collimating lens makes the light signal forms the parallel light. The optical transceiver unit is used for receiving and sending the optical signal and is suitable for two groups of communication protocol systems, and the optical transceiver unit comprises a first receiving part, a second receiving part, a third transmitting part and a fourth transmitting part. Wherein the first receiving element is arranged corresponding to the first filter sheet. The second receiving piece is arranged corresponding to the second filter piece. The third transmitting part is arranged corresponding to the third filter plate. The fourth transmitting part is arranged corresponding to the fourth filter. Wherein the first receiving element and the second receiving element are respectively arranged corresponding to one of the third emitting element and the fourth emitting element.

In an embodiment of the utility model, when the optical signal is transmitted to the first filter, an incident angle of the optical signal entering the first filter is 45 degrees.

In an embodiment of the utility model, when the optical signal is transmitted to the second filter, an incident angle of the optical signal entering the second filter is 45 degrees.

In an embodiment of the utility model, when the optical signal is transmitted to the third filter, an incident angle of the optical signal entering the third filter is 20 degrees to 30 degrees.

In an embodiment of the utility model, when the optical signal is transmitted to the fourth filter, an incident angle of the optical signal entering the fourth filter is 15 degrees to 25 degrees.

In an embodiment of the utility model, the receiving wavelength range of the first receiving element is 1575nm to 1580 nm.

In an embodiment of the utility model, the receiving wavelength range of the second receiving element is between 1490nm and 1500 nm.

In an embodiment of the utility model, the third emitting element emits light with a wavelength ranging from 1300nm to 1320 nm.

In an embodiment of the utility model, the fourth emitting element emits light with a wavelength ranging from 1260nm to 1280 nm.

In an embodiment of the present invention, an emission wavelength range difference between the third emitter and the fourth emitter is not more than 60 nm.

In summary, the present invention provides a passive optical network dual system module, which uses the configuration of two receiving devices and two transmitting devices in an optical transceiver unit to support the use of two sets of communication protocols simultaneously on the same optical path. In addition, by means of the angle setting of each filter in the light path conversion unit to install two sets of receiving parts and emitting parts in narrow and small space, not only can not increase holistic occupation space, and still can maintain good signal transmission effect.

Drawings

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Other features and effects of the present invention will be apparent from the embodiments with reference to the accompanying drawings, in which:

FIG. 1 is a schematic diagram of an optical transmission sub-module in the prior art;

FIG. 2 is a schematic structural diagram of a passive optical network dual system module according to the present invention;

FIG. 3 is a schematic structural diagram of a cross section of a passive optical network dual system module according to the present invention;

fig. 4 is a schematic structural diagram of a light-containing path of a cross section of a passive optical network dual-system module according to the present invention.

In the figure: 1-optical transmission submodule, 11-optical transmitter, 12-optical receiver, 2-passive optical network dual-system module, 20-optical guiding unit, 22-optical path conversion unit, 220-first filter, 221-first collimating lens, 222-second filter, 223-second collimating lens, 224-third filter, 226-fourth filter, 240-first receiving element, 242-second receiving element, 244-third transmitting element, 246-fourth transmitting element, S-optical signal and 9-optical fiber.

Detailed Description

Before the present invention is described in detail, it should be noted that in the following description, like elements are represented by like numerals, and in addition, the relevant parameters such as shapes, sizes, thicknesses, angles, and the like of the elements in the drawings are not drawn to scale, and are simplified for clarity of illustration only.

The embodiment disclosed by the utility model is a passive optical network dual-system module. For example, the passive optical network dual system module may be installed in a subscriber Optical Network Unit (ONU) of a Passive Optical Network (PON) system, which is a Fiber To The Curb (FTTC), Fiber To The Building (FTTB), or Fiber To The Home (FTTH) system, a system and apparatus employing a point-to-multipoint network architecture and FTTC, FTTB, FTTH employed in a remote subscriber residence.

First, the structural appearance and function of the passive optical network dual system module in this embodiment will be described. Fig. 2 is a schematic structural diagram of a passive optical network dual-system module according to the present invention. The passive optical network dual system module 2 includes an optical guiding unit 20, an optical path converting unit 22 and an optical transceiver unit. The light guiding unit 20 is connected to the optical fiber 9, and the light guiding unit 20 is adapted to output an optical signal. The optical path conversion unit 22 is connected to the optical guiding unit 20, and is used for receiving the optical signal and changing the optical path of the optical signal. The optical transceiver unit is used for receiving and transmitting optical signals, and includes a first receiving element 240, a second receiving element 242, a third emitting element 244 and a fourth emitting element 246. The first receiving element 240 and the second receiving element 242 are respectively disposed corresponding to one of the third emitting element 244 and the fourth emitting element 246. In other words, the receiving element and the emitting element are arranged in pairs, and the installation positions of the receiving element and the emitting element in fig. 2 are only schematic diagrams in the embodiment, and the actual installation positions are still determined according to the arrangement requirements.

Next, the internal structure of the passive optical network dual-system module in the embodiment is further disclosed with reference to the cross-sectional view. Referring to fig. 3, fig. 3 is a schematic cross-sectional view of a passive optical network dual system module according to the present invention. The passive optical network dual system module 2 includes an optical guiding unit 20, an optical path converting unit 22 and an optical transceiver unit. The light path conversion unit 22 is connected to the light guiding unit 20, and sequentially includes a first collimating lens 221, a first filter 220, a second filter 222, a second collimating lens 223, a third filter 224, and a fourth filter 226 along a direction toward the light guiding unit 20. The optical transceiver unit includes a first receiving element 240, a second receiving element 242, a third emitting element 244 and a fourth emitting element 246. The first receiving element 240 is disposed corresponding to the first filter sheet 220; the second receiving part 242 is disposed corresponding to the second filter 222; the third emitter 244 is disposed corresponding to the third filter 224; the fourth emitting element 246 is disposed corresponding to the fourth filter 226. The first collimating lens 221 and the second collimating lens 223 make the optical signal form parallel light.

The design positions of the filter, the receiving element and the emitting element are further described herein. It should be noted that, since the device capable of installing the module in the present embodiment is usually located in a narrow space, how to achieve a good balance while simplifying the arrangement of the components and reducing the overall space is a main consideration in designing the positions of the components. In the present embodiment, it is considered first whether the transmission path of the optical signal is blocked, which inevitably causes the transmission effect to be reduced, and therefore, it is necessary to provide a proper installation space for the receiving member and/or the transmitting member, however, the movement of any one of the receiving member and/or the transmitting member increases the collision between the components. In addition, when the receiving element and/or the transmitting element are moved, the collimating lens and the filter inside the light path conversion unit also need to be adjusted accordingly, and in order to reduce the effect that the light spot affects the signal transmission, the filter at the transmitting end is usually installed near the light focusing point of the transmitting element, and the small-size filter of the light spot can be used to save space, therefore, under the consideration of layers, the design of the elements in the light adjusting unit is a great challenge.

In view of the above, please refer to fig. 3 and fig. 4 together for further explanation of the optical detailed path of the optical path conversion unit, and fig. 4 is a schematic structural diagram of an optical path containing section of the passive optical network dual system module according to the present invention. Since the filtering wavelength of each filter is determined by the requirements of the receiving element and/or the emitting element corresponding to the filter, the description is only made in terms of each filter in the present application. The way of defining the angle of the filter is determined by the angle of incidence of light to the filter. That is, in the passive optical network dual system module 2 of the present embodiment, when the optical signal S (dotted line) is transmitted to the first filter 220, the incident angle of the optical signal S entering the first filter 220 is 45 degrees; when the optical signal S is transmitted to the second filter 222, the incident angle of the optical signal S entering the second filter 222 is 45 degrees; when the optical signal S is transmitted to the third filter 224, the incident angle of the optical signal S entering the third filter 224 is 20 to 30 degrees, for example, 25 degrees in this embodiment; when the optical signal is transmitted to the fourth filter 226, the incident angle of the optical signal S entering the fourth filter 226 is 15 to 25 degrees, for example 20 degrees in this embodiment.

It should be noted that the optical signal of the present invention is not a single wavelength, and in the case of different wavelengths, if the optical signal is directly transmitted to the optical guiding unit, the optical signal may be interfered, thereby causing a problem of poor reception. Therefore, the passive optical network dual-system module of the utility model is provided with the first collimating lens and the second collimating lens, and the two collimating lenses can enable the optical signal to form parallel light so as to be convenient for the receiving part to receive.

In the passive optical network dual system module of the present invention, the first receiving element receives a wavelength ranging from 1575nm to 1580 nm. The second receiver receives a wavelength in the range 1480nm to 1500 nm. The third emitting element emits light in a wavelength range of 1300nm to 1320 nm. The fourth emitter emits light in the wavelength range from 1260nm to 1280 nm. And wherein an emission wavelength range difference between the third emitter and the fourth emitter is no greater than 60 nm.

The Passive Optical network dual-system module can simultaneously provide services of two communication protocol systems in the same structure, for example, can simultaneously serve two systems of GPON (Gigabit-Capable Passive Optical network) and XGS-PON10G-PON (10Gigabit-Capable Symmetric Passive Optical network). Of course, the above-mentioned communication system is only an example, and any communication system that can be applied to the passive optical network dual system module in the present application should not be out of the scope of the present invention.

Accordingly, the present invention discloses a passive optical network dual system module, and has the following advantages:

1. the dual system components are combined in the same module, so that when two communication systems are required to be replaced or used simultaneously, hardware devices such as a modem and the like do not need to be additionally disassembled, and the cost for replacing the systems is greatly reduced.

2. Through the arrangement of the collimating lens, the optical signal can form parallel light, and the quality of the optical signal received by the receiving part is improved.

3. By means of the design between the third filter and the fourth filter, the arrangement of the small angle not only greatly saves the whole space, but also reduces the problem of unstable optical signals caused by light spots.

The technical content of the present invention is not limited to the embodiments described above, and all the same concepts and principles as those of the present invention are included in the claims of the present invention. It should be noted that the directions of the elements described in the present invention, such as "upper", "lower", "above", "below", "horizontal", "vertical", "left", "right", etc., do not indicate absolute positions and/or directions. The definitions of elements, such as "first" and "second," are not words of limitation, but rather are words of distinction. As used herein, "comprising" or "comprises" encompasses both "and" having "and means either an exclusion or an addition to the element, operation step, and/or group or combination of the foregoing. Also, unless specifically stated otherwise, the order of the steps of operations does not represent an absolute order. Furthermore, reference to an element in the singular (e.g., using the articles "a" or "an") does not mean "one and only one" but rather "one or more" unless specifically stated otherwise. As used herein, "and/or" means "and" or "as well as" and "or". As used herein, the term "range-related" is intended to include all and/or range limitations, such as "at least," "greater than," "less than," "not greater than," and the like, and refers to either the upper or lower limit of a range.

From the above, it is only the embodiment of the present invention, and it is not necessarily limited to the scope of the utility model, and all the equivalent changes and modifications made according to the claims and the contents of the patent specification are still within the scope covered by the present invention.

Claims

1. A passive optical network dual-system module is characterized in that: comprises the following steps:

the optical guiding unit is connected with an optical fiber and is used for transmitting an optical signal, and the optical signal is a non-single wavelength;

a light path conversion unit connected to the light guide unit for receiving the light signal and changing the light path of the light signal, the light path conversion unit sequentially comprises a first collimating lens, a first filter, a second collimating lens, a third filter and a fourth filter along the direction towards the light guide unit, wherein the first collimating lens and the second collimating lens enable the light signal to form parallel light; and

an optical transceiver unit for receiving and transmitting the optical signal, the optical transceiver unit being adapted to two communication protocol systems, the optical transceiver unit comprising:

the first receiver is arranged corresponding to the first filter plate;

the second receiving piece is arranged corresponding to the second filter plate;

the third transmitting piece is arranged corresponding to the third filter plate; and

the fourth transmitting piece is arranged corresponding to the fourth filter;

the first receiving piece and the second receiving piece are respectively arranged corresponding to one of the third emitting piece and the fourth emitting piece.

2. The dual system module of claim 1, wherein: when the optical signal is transmitted to the first filter, the incident angle of the optical signal entering the first filter is 45 degrees.

3. The dual system module of claim 1, wherein: when the optical signal is transmitted to the second filter, the incident angle of the optical signal entering the second filter is 45 degrees.

4. The dual system module of claim 1, wherein: when the optical signal is transmitted to the third filter, the incident angle of the optical signal entering the third filter is 20 to 30 degrees.

5. The dual system module of claim 1, wherein: when the optical signal is transmitted to the fourth filter, the incident angle of the optical signal entering the fourth filter is 15 to 25 degrees.

6. A passive optical network dual system module according to claim 1, wherein: the first receiving element receives light with a wavelength ranging from 1575nm to 1580 nm.

7. The dual system module of claim 1, wherein: the second receiving element receives a wavelength range of 1480nm to 1500 nm.

8. The dual system module of claim 1, wherein: the third emitter emits light in a wavelength range of 1300nm to 1320 nm.

9. The dual system module of claim 1, wherein: the fourth emitter emits light in the wavelength range from 1260nm to 1280 nm.

10. The dual system module of claim 1, wherein: the difference in emission wavelength range between the third emitter and the fourth emitter is no greater than 60 nm.