Reconfigurable ODN link based on uninterrupted signal optical power supply on-demand switching in flexible rate PON

Abstract

The invention discloses a reconfigurable ODN (Optical Distribution Network) link based on uninterrupted signal optical power supply on-demand switching in a flexible rate PON (Passive Optical Network), and belongs to the field of optical fiber communication. The reconfigurable ODN link comprises an optical line terminal (OLT), a first coupler, N photodiodes (PDs), a capacitor, a plurality of optical network units (ONUs), a one-to-eight coupler, an optical switch and a central processing unit (CPU). Signal light emitted by an OLT is split by a first coupler and then is divided into two paths of light with different optical powers, one path of signal light with smaller optical power is received by N PDs and generates voltage to charge a capacitor, and the fully charged capacitor is used for supplying power to a CPU, so that the CPU controls the state of an optical switch and selects an accessed ONU; the other path of signal light with larger optical power is transmitted to the corresponding ONU to be received after passing through the optical switch; and the CPU is used for regularly controlling the state of the optical switch, so that the reconfigurable ODN function is realized.

Description

Technical Field

[0001] The present invention belongs to the field of optical fiber communication, and more specifically, relates to a reconfigurable optical distribution network (ODN) link for interruption-free signal optical power supply on-demand switching in a flexible-rate passive optical network (PON). Background Art

[0002] Optical fiber communication technology plays an important role in modern communication systems. In particular, passive optical network (PON), as one of the key technologies for access networks, has been widely used in broadband access services for homes and enterprises due to its advantages such as high bandwidth, low latency, and high reliability. In traditional PON architectures, the optical distribution network (ODN) of the network is usually deployed in a fixed structure, and the power supply method and rate configuration are relatively rigid, making it difficult to meet the growing flexibility requirements.

[0003] Traditional passive optical power splitters have been widely used in PON systems, but their fixed power splitting ratio and limited flexibility have certain limitations when dealing with dynamically changing network requirements. To achieve flexible optical power adjustment, researchers have proposed the concept of tunable optical power splitters. Such splitters can dynamically adjust the optical power allocated to each ONU according to actual needs, thereby optimizing the link budget and balancing the link power without increasing additional power consumption. A flexible optical distribution network (ODN) can dynamically adjust the power splitting ratio according to different application scenarios and user requirements, realize flexible network resource allocation, and ensure the efficient operation of the network. Although tunable power splitters have their own advantages in performance and application, most research focuses on active devices. These active devices usually require external power supply for driving, increasing the complexity and power consumption of the system. In PON, due to its characteristics of large-scale deployment and long-distance transmission, passive devices are more needed to reduce the system cost and maintenance difficulty. Therefore, the application of existing active tunable power splitters in PON has certain limitations.

[0004] With the continuous change of network requirements, especially in terms of bandwidth and rate, the requirements for the flexibility, scalability, and on-demand configuration of optical networks are getting higher and higher. Existing optical distribution networks (ODN) often cannot meet the requirements of flexible rate switching. Especially when facing the interruption of optical signal power supply requirements, it may lead to unstable or interrupted signal transmission. In addition, existing PON systems lack sufficient flexibility and intelligence in dealing with the bandwidth requirements of different users, and cannot achieve on-demand switching and automatic optimization configuration based on actual needs. Summary of the Invention

[0005] Aiming at the defects of the prior art, the purpose of the present invention is to provide a reconfigurable ODN link based on interruption-free signal optical power supply on-demand switching in flexible-rate PON, aiming to solve the problems that the prior art cannot achieve passivity and has a relatively high cost.

[0006] To achieve the above object, the present invention provides a reconfigurable ODN link based on interruption-free signal optical power supply on-demand switching in flexible-rate PON, including an optical line terminal (OLT), a first coupler, N photodiodes (PDs), a capacitor, multiple optical network units (ONUs), a 1-to-N coupler, an optical switch, and a central processing unit (CPU) for controlling the optical switch. The signal light emitted by the OLT is split by the first coupler into two paths with different optical power levels. One path of signal light with a lower optical power is received by N PDs, generating a certain voltage to charge the capacitor. The fully charged capacitor is used to supply power to the CPU, enabling it to control the state of the optical switch and select the ONU to be accessed. The other path of signal light with a higher optical power is transmitted to the corresponding ONU for reception after passing through the optical switch. The CPU is used to periodically control the state of the optical switch, thereby realizing the reconfigurable ODN function.

[0007] Preferably, the first coupler is a 9:1 coupler, such that 10% of the signal light is received by N PDs.

[0008] Preferably, the 1-to-N coupler is a 1-to-8 coupler.

[0009] The present invention also provides a method for reconfiguring an ODN link, including: the signal light emitted by the OLT is split by the first coupler into two paths. One path of signal light is received by N PDs, generating a voltage to charge the capacitor. The fully charged capacitor supplies power to the CPU, enabling it to control the state of the optical switch and select the ONU to be accessed. The other path of signal light is transmitted to the corresponding ONU for reception after passing through the optical switch. The CPU periodically controls the state of the optical switch, thereby realizing the reconfigurable ODN function.

[0010] The present invention also provides an electronic device, including: a computer-readable storage medium and a processor;

[0011] The computer-readable storage medium is used to store executable instructions;

[0012] The processor is used to read the executable instructions stored in the computer-readable storage medium and execute the above method.

[0013] The present invention also provides a computer-readable storage medium, which stores computer instructions for causing a processor to execute the above method.

[0014] The present invention also provides a computer program product, including a computer program or instructions, which, when executed by a processor, implement the above-mentioned method.

[0015] Through the above technical solution conceived by the present invention, compared with the prior art, by using part of the signal light to perform photoelectric conversion using a PD to generate electrical energy to achieve dynamic allocation of optical power, without using an additional battery for additional power supply, the passive requirement of PON is achieved. At the same time, through the reconfigurable ODN design with on-demand allocation, dynamic allocation of throughput is achieved, thereby realizing the maximum utilization of throughput and meeting the requirements of low-carbon energy conservation and cost reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural diagram of a reconfigurable optical distribution network (ODN) link for interruption-free signal light-powered on-demand switching in a flexible-rate passive optical network (PON) shown in an exemplary embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0018] The present invention provides a reconfigurable ODN link for interruption-free signal light-powered on-demand switching in a flexible-rate PON, including an optical line terminal (OLT), a first coupler, N photodiodes (PDs), a capacitor, multiple optical network units (ONUs), a 1-to-N coupler, an optical switch, and a central processing unit (CPU) for controlling the optical switch. The signal light emitted by the OLT is split by the first coupler into two paths with different optical power levels. One path of signal light with a smaller optical power is received by the N PDs, generating a certain voltage to charge the capacitor. The fully charged capacitor is used to supply power to the CPU, enabling it to control the state of the optical switch and select the ONU to be connected. The other path of signal light with a larger optical power is transmitted to the corresponding ONU for reception after passing through the optical switch. The CPU is used to periodically control the state of the optical switch, thereby realizing the reconfigurable ODN function.

[0019] Specifically, the first coupler is a 9:1 coupler, such that 10% of the signal light is received by the N PDs.

[0020] Specifically, the 1-to-N coupler is a 1-to-8 coupler.

[0021] The present invention also provides a method for reconstructing an ODN link, including: the optical signal emitted by the OLT is split into two paths after being split by the first coupler. One path of the optical signal is received by N PDs, generating a voltage to charge the capacitor. The fully charged capacitor powers the CPU, enabling it to control the state of the optical switch and select the accessed ONU. The other path of the optical signal is transmitted to the corresponding ONU through the optical switch and is received there. The CPU controls the state of the optical switch at regular intervals, thereby realizing the reconfigurable ODN function.

[0022] The present invention also provides an electronic device, including: a computer-readable storage medium and a processor;

[0023] The computer-readable storage medium is used to store executable instructions;

[0024] The processor is used to read the executable instructions stored in the computer-readable storage medium and execute the above method.

[0025] The present invention also provides a computer-readable storage medium, which stores computer instructions for causing a processor to execute the above method.

[0026] The present invention also provides a computer program product, including a computer program or instructions, which, when executed by a processor, implement the above method.

[0027] In order to illustrate the technical solution of the present invention, the following will be described through specific embodiments.

[0028] As Figure 1 shown is a structural diagram of a reconfigurable optical distribution network (ODN) link for interruption-free optical signal power supply on-demand switching in a flexible-rate passive optical network (PON) according to an exemplary embodiment of the present invention. The reconfigurable ODN link includes:

[0029] An optical line terminal (OLT), a 9:1 coupler, a photodiode (PD), a capacitor, an optical network unit (ONU), an eight-way coupler, an optical switch, and a central processing unit (CPU) for controlling the optical switch. After the optical signal is emitted by the OLT and split by the 9:1 coupler, 10% of the optical signal is received by 8 PDs, generating a certain voltage to charge the capacitor. The fully charged capacitor can power the CPU to control the state of the optical switch. The remaining 90% of the optical signal continues to be transmitted, passes through the optical switch, and is received at the ONU. The CPU controls the state of the optical switch at regular intervals, thereby realizing the reconfigurable ODN function.

[0030] As an optional embodiment of the present invention, the reconfigurable ODN link is used to perform optoelectronic conversion. The optoelectronic conversion effect can be described by the formula: E 光子 = hv

[0031] wherein, E 光子 is the photon energy, h is Planck's constant, and v is the photon frequency.

[0032] When the energy of the photon is greater than or equal to the bandgap energy E g of the material, the photon will be able to excite electrons in the material from the valence band to the conduction band, generating electron-hole pairs. According to the law of conservation of energy, in the process of photovoltaic conversion, the energy of the photon is used for the excitation of electrons and the increase of kinetic energy: E 光子 = E g + E 电子动能

[0033] wherein, E g is the bandgap energy of the material, and E 电子动能 is the kinetic energy of the excited electrons.

[0034] When the PN junction of the PD is illuminated, as long as the energy of the incident photon is greater than the bandgap width, the minority carriers excited by the intrinsic absorption of photons by the semiconductor can cause the photovoltaic effect. Due to the action of the built-in electric field in the PN junction region, there is an accumulation of photo-generated electrons near the N-region boundary and an accumulation of photo-generated holes near the P-region boundary. They generate a photo-generated electric field opposite to the direction of the built-in electric field of the thermally balanced PN junction, and its direction points from the P region to the N region. This electric field reduces the potential barrier, and the reduction amount is the photo-generated potential difference, with the P end being positive and the N end being negative. At this time, the Fermi level is separated, thus generating a voltage. Moreover, the more light energy absorbed at the interface, that is, the more electron-hole pairs generated in the interface layer by illumination, the greater the current.

[0035] Those of ordinary skill in the art can understand that the various units included in the above embodiments are only divided according to functional logic, but are not limited to the above division, as long as the corresponding functions can be achieved; in addition, the specific names of the functional units are only for the convenience of mutual distinction and do not limit the protection scope of the present invention.

[0036] Those of ordinary skill in the art can also understand that all or part of the steps in implementing the method of the above embodiments can be completed by instructing relevant hardware through a program, and the program can be stored in a computer-readable storage medium, and the storage medium includes ROM / RAM, disks, optical discs, etc.

[0037] Those skilled in the art can easily understand that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A reconfigurable ODN link based on on-demand switching of non-interruptible signal optical power supply in a flexible rate PON, characterized in that: It includes an optical line terminal OLT, a first coupler, N photodiodes PD, a capacitor, multiple optical network units ONU, a one-to-N coupler, an optical switch and a central processing unit CPU. The signal light emitted by the OLT is split by the first coupler into two paths of light with different optical powers. One path of signal light with a smaller optical power is received by the N PDs to generate a voltage to charge the capacitor. The fully charged capacitor is used to power the CPU to control the state of the optical switch and select the connected ONU; the other path of signal light with a larger optical power is transmitted to the corresponding ONU after passing through the optical switch and is received; the CPU is used to control the state of the optical switch at a timing, thereby realizing the reconfigurable ODN function.

2. The reconfigurable ODN link based on on-demand switching of non-interruptible signal optical power supply in flexible rate PON according to claim 1 is characterized in that: The first coupler is a 9:1 coupler, so that 10% of the signal light is received by N PDs.

3. The reconfigurable ODN link based on on-demand switching of non-interruptible signal optical power supply in flexible rate PON according to claim 1 is characterized in that: The one-to-N coupler is a one-to-eight coupler.

4. A method for reconstructing an ODN link, characterized in that: include: The signal light emitted by the OLT is split by the first coupler into two paths with different optical powers. One path of signal light with lower optical power is received by N PDs, generating voltage to charge the capacitor. The fully charged capacitor powers the CPU to control the state of the optical switch and select the connected ONU. The other path of signal light with higher optical power is transmitted to the corresponding ONU after passing through the optical switch and is received. The CPU controls the state of the optical switch at a fixed time, thereby realizing the reconfigurable ODN function.

5. An electronic device, characterized in that: include: A computer readable storage medium and a processor; The computer-readable storage medium is used to store executable instructions; The processor is configured to read the executable instructions stored in the computer-readable storage medium and execute the method according to claim 5.

6. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer instructions, and the computer instructions are used to cause a processor to execute the method according to claim 5.

7. A computer program product comprising a computer program or instructions, characterized in that When the computer program or instruction is executed by a processor, the method according to claim 5 is implemented.

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