High-resolution optical performance monitoring device and method based on arrayed waveguide grating
By using an optical performance monitoring device based on an arrayed waveguide grating, high-resolution optical performance monitoring is achieved by combining an optical switch with an arrayed waveguide grating. This solves the problem of high cost in existing technologies and realizes miniaturized, low-cost, and highly reliable optical performance monitoring.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- BROADEX TECHNOLOGIES CO LTD
- Filing Date
- 2024-10-09
- Publication Date
- 2026-04-17
AI Technical Summary
In existing optical performance monitoring technologies, tunable optical filters, as core components, suffer from high costs, and the application of existing arrayed waveguide gratings in high-resolution optical performance monitoring has not been fully developed.
An optical performance monitoring device based on an arrayed waveguide grating is adopted, which includes an optical input terminal, an optical switch, an arrayed waveguide grating, a frequency control unit, a photodetector array, and a data processing circuit. By combining the optical switch with the arrayed waveguide grating, the frequency control unit can control the spectral frequency to achieve high-resolution optical performance monitoring.
It achieves high-resolution optical performance monitoring without increasing system complexity, and has the advantages of small size, low cost, and high reliability. The number of monitoring channels and sampling density are increased by adjusting the frequency shift of the arrayed waveguide grating.
Smart Images
Figure CN121887285A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of optical performance monitoring technology, and in particular to a high-resolution optical performance monitoring device and method based on an arrayed waveguide grating. Background Technology
[0002] Human production and daily life are inseparable from networks. With the rapid increase in demand for network bandwidth and the high-speed development of emerging network services and data applications, the transmission capacity of optical networks is increasing, the number of transmission nodes is growing, and the system complexity is constantly increasing. To ensure the safe and efficient operation of optical networks, optical performance monitoring (OPM) is required for important nodes and links in the optical network. Currently, mainstream OPM modules typically include tunable optical filters (TOF) based on micro-electro-mechanical system (MEMS) rotating mirrors, which have the advantages of low insertion loss and narrow 3dB linewidth, but are relatively expensive.
[0003] Arrayed waveguide gratings (AWGs), utilizing planar lightwave circuit (PLC) technology, are key components for wavelength multiplexing and demultiplexing optical signal transmission in dense wavelength division multiplexing (DWDM) systems. AWGs offer versatility, high repeatability, low loss, low crosstalk, high reliability, small size, low cost, and strong integration with semiconductor devices. Since AWGs do not contain moving components such as MEMS systems, and their performance parameters, such as linewidth and crosstalk, are highly designable, OPM modules developed based on them offer advantages such as small size, simple optical path, low cost, high reliability, and high resolution. Furthermore, thanks to the known temperature and stress frequency shift characteristics of silicon-based AWGs, the channel spacing of matrix AWGs can be further refined, increasing the signal acquisition density of OPM modules and improving resolution. Summary of the Invention
[0004] The purpose of this invention is to address the high cost of using tunable optical filters as core components in existing optical performance monitoring technologies, and to propose a high-resolution optical performance monitoring device and method based on arrayed waveguide gratings, so as to expand the application of arrayed waveguide gratings in the field of high-resolution optical performance monitoring.
[0005] In a first aspect, the present invention provides a high-resolution optical performance monitoring device based on an arrayed waveguide grating, characterized in that the device includes an optical input terminal, an optical switch, an arrayed waveguide grating, a frequency modulation unit, a photodetector array, a data processing circuit, and a control circuit; characterized in that the frequency modulation unit is connected to the arrayed waveguide grating for frequency modulation, the data processing circuit is connected to the signal output port of the photodetector array; and the control circuit is connected to the optical switch, the frequency modulation unit, and the data processing circuit, for acquiring instructions sent by the data processing circuit for the optical switch and the frequency modulation unit.
[0006] Furthermore, the optical switch can be a mechanical optical switch or a non-mechanical optical switch.
[0007] Furthermore, the arrayed waveguide grating can be a heat-sensitive arrayed waveguide grating or a heat-insensitive arrayed waveguide grating.
[0008] Furthermore, the signal output from the arrayed waveguide grating is injected into the photodetector array 105 via spatial coupling or optical fiber connection.
[0009] Furthermore, the frequency control unit controls the frequency of the arrayed waveguide grating by means of temperature control or mechanical control.
[0010] Furthermore, the photodetector array is composed of photodetector units, and each output channel of the array waveguide grating 103 corresponds to one photodetector unit.
[0011] Furthermore, the applicable wavelength range includes O-band 1260~1360nm, E-band 1360~1460nm, S-band 1460~1530nm, C-band 1530~1565nm, L-band 1565~1625nm, U-band 1625~1675nm, as well as other longer or shorter communication bands that have evolved.
[0012] Secondly, the present invention also provides a high-resolution optical performance monitoring method based on an arrayed waveguide grating, implemented using the high-resolution optical performance monitoring device based on an arrayed waveguide grating described in the first aspect, the method comprising: When the original signal light enters the device through the optical input terminal, the optical switch connects to the initial input channel of the arrayed waveguide grating, and the m output channels of the arrayed waveguide grating generate the first group of signals, which contains m signal units. The first group of signals is collected by the photodetector array and transmitted to the data processing circuit. The data processing circuit sends instructions to the control circuit, and the control circuit controls the optical switch to sequentially switch the remaining n-1 input channels of the arrayed waveguide grating so that the data processing circuit can acquire the second to nth groups of signals collected by the photodetector array. The data processing circuit acquires a total of n sets of signals, totaling n×m signal units. Since the spectrum of the arrayed waveguide grating is known, the n×m intensity values of the original signal light entering the optical input end can be calculated, thereby restoring the spectrum of the original signal light.
[0013] Furthermore, during the acquisition of all n×m signal units, the data processing circuit sends an instruction to the control circuit to control the frequency modulation unit to keep the spectral frequency of the arrayed waveguide grating unchanged. If the required monitoring resolution is high, the control circuit can control the frequency modulation unit to cause the spectrum of the arrayed waveguide grating to undergo p frequency shifts. After each frequency shift, the data processing circuit 106 will acquire another n×m signal units, for a total of (p+1)×n×m signal units, which means the resolution is p+1 times the original.
[0014] Compared with the prior art, the embodiments of the present invention have at least the following advantages: The aforementioned high-resolution optical performance monitoring device and method based on arrayed waveguide gratings enhances the demultiplexing capability of optical signals by combining optical switches with arrayed waveguide gratings, achieving high-resolution optical performance monitoring without increasing system complexity. It boasts advantages such as small size, low cost, and high reliability. Furthermore, by adjusting the frequency shift of the arrayed waveguide grating, the number of monitoring channels can be increased, improving sampling density and achieving even higher resolution optical performance monitoring. Attached Figure Description
[0015] Figure 1 This is a schematic diagram of a high-resolution optical performance monitoring device based on an arrayed waveguide grating. Figure 2 This is a feature map of the filter window of a high-resolution optical performance monitoring device based on an arrayed waveguide grating; Figure 3 This is a light spectrum of a signal to be monitored; Figure 4 This is a restored original signal light spectrum; Figure 5 This is a frequency-shifted filtered window feature map of a high-resolution optical performance monitoring device based on an arrayed waveguide grating; Figure 6 This is a restored, higher-resolution image of the original signal light spectrum. Detailed Implementation
[0016] The following detailed description of a high-resolution optical performance monitoring device and method based on an arrayed waveguide grating, in conjunction with specific embodiments, further illustrates the present invention. Example
[0017] This invention provides a high-resolution optical performance monitoring device based on an arrayed waveguide grating, such as... Figure 1 As shown, the device includes an optical input terminal 101, an optical switch 102, an arrayed waveguide grating 103, a frequency modulation unit 104, a photodetector array 105, a data processing circuit 106, and a control circuit 107. The frequency modulation unit 104 is connected to the arrayed waveguide grating 103 for frequency modulation. The data processing circuit 106 is connected to the signal output port of the photodetector array 105. The control circuit 107 is connected to the optical switch 102, the frequency modulation unit 104, and the data processing circuit 106, and is used to acquire commands sent by the data processing circuit 106 to the optical switch 102 and the frequency modulation unit 104.
[0018] The optical switch 102 is a mechanical optical switch.
[0019] The arrayed waveguide grating 103 is a heat-sensitive arrayed waveguide grating.
[0020] The signal output from the arrayed waveguide grating 103 is injected into the photodetector array 105 via spatial coupling.
[0021] The frequency control unit 104 controls the frequency of the arrayed waveguide grating 103 by temperature control.
[0022] The photodetector array 105 is composed of photodetector units, and each output channel of the array waveguide grating 103 corresponds to one photodetector unit.
[0023] The applicable wavelength range is 1530~1625nm in the C+L band.
[0024] In this embodiment of the invention, the optical switch 102 is a 1×8 optical switch; the arrayed waveguide grating 103 includes 8 input channels and 60 output channels, with a channel spacing of 50 GHz and a typical 3 dB linewidth of 1.37 GHz. The filter window feature map under the combined action of the optical switch 102 is as follows: Figure 2 As shown, the resolution can reach 6.25GHz. Example
[0025] This invention provides a high-resolution optical performance monitoring method based on an arrayed waveguide grating, using the high-resolution optical performance monitoring device based on an arrayed waveguide grating as described in Example 1. The method is as follows: When the original signal light enters the device through the optical input terminal 101, the optical switch 102 connects to the initial input channel of the arrayed waveguide grating 103. The 60 output channels of the arrayed waveguide grating 103 generate the first group of signals, which contains 60 signal units. The first group of signals is collected by the photodetector array 105 and transmitted to the data processing circuit 106. The data processing circuit 106 sends instructions to the control circuit 107, and the control circuit 107 controls the optical switch 102 to sequentially switch the remaining 7 input channels of the array waveguide grating 103 so that the data processing circuit 106 can acquire the 2nd to 8th groups of signals collected by the photodetector array 105. The data processing circuit 106 acquires a total of 8 sets of signals, totaling 8×60 signal units. Since the spectrum of the arrayed waveguide grating 103 is known, the 8×60 intensity values of the original signal light entering the optical input terminal 101 can be calculated, thereby restoring the spectrum of the original signal light.
[0026] In this embodiment of the invention, during the acquisition of all 8×60 signal units, the data processing circuit 106 sends an instruction to the control circuit 107 to control the frequency modulation unit 104 to maintain the spectral frequency of the arrayed waveguide grating 103 unchanged; the original signal light spectrum is as follows: Figure 3 As shown, the spectrum restored by the high-resolution optical performance monitoring device based on arrayed waveguide grating described in Example 1 is as follows. Figure 4 As shown, the resolution is 6.25 GHz. Example
[0027] This invention provides a method for further improving the resolution of optical performance monitoring, using a high-resolution optical performance monitoring device based on an arrayed waveguide grating as described in Example 1. The method is as follows: After obtaining a complete 8×60 signal units using the method described in Example 2, the frequency adjustment unit 104 is controlled by the control circuit 107 to change the temperature of the arrayed waveguide grating 103, thereby causing a frequency shift in the spectrum of the arrayed waveguide grating 103. After the frequency shift, the data processing circuit 106 will obtain another 8×60 signal units, for a total of 2×8×60 signal units, which is twice the original.
[0028] In this embodiment of the invention, the original signal light spectrum remains as follows: Figure 3 As shown, the frequency control unit 104 shifts the center frequency of the arrayed waveguide grating 103 by 3.125 GHz by controlling the temperature. The characteristic spectrum of the filter window under the combined action of the arrayed waveguide grating 103 and the optical switch 102 after the frequency shift is shown below. Figure 5As shown, the spectrum restored by the high-resolution optical performance monitoring device based on arrayed waveguide grating described in Example 1 is as follows. Figure 6 As shown, the resolution is 3.125 GHz.
[0029] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.
Claims
1. A high-resolution optical performance monitoring device based on an arrayed waveguide grating, characterized in that, The device includes an optical input terminal (101), an optical switch (102), an arrayed waveguide grating (103), a frequency modulation unit (104), a photodetector array (105), a data processing circuit (106), and a control circuit (107); characterized in that the frequency modulation unit (104) is connected to the arrayed waveguide grating (103) for frequency modulation, the data processing circuit (106) is connected to the signal output port of the photodetector array (105); and the control circuit (107) is connected to the optical switch (102), the frequency modulation unit (104), and the data processing circuit (106) for acquiring the instructions sent by the data processing circuit (106) for the optical switch (102) and the frequency modulation unit (104).
2. The high-resolution optical performance monitoring device based on arrayed waveguide gratings according to claim 1, characterized in that, The optical switch (102) can be a mechanical optical switch or a non-mechanical optical switch.
3. The high-resolution optical performance monitoring device based on arrayed waveguide gratings according to claim 1, characterized in that, The arrayed waveguide grating (103) can be a heat-sensitive arrayed waveguide grating or a heat-insensitive arrayed waveguide grating.
4. The high-resolution optical performance monitoring device based on arrayed waveguide gratings according to claim 1, characterized in that, The signal output from the arrayed waveguide grating (103) is injected into the photodetector array (105) via spatial coupling or fiber optic connection.
5. The high-resolution optical performance monitoring device based on arrayed waveguide gratings according to claim 1, characterized in that, The frequency control unit (104) controls the frequency of the array waveguide grating (103) by either temperature control or mechanical control.
6. The high-resolution optical performance monitoring device based on arrayed waveguide gratings according to claim 1, characterized in that, The photodetector array (105) is composed of photodetector units, and each output channel of the array waveguide grating (103) corresponds to a photodetector unit.
7. The high-resolution optical performance monitoring device based on an arrayed waveguide grating according to any one of claims 1 to 6, characterized in that, The applicable wavelength range includes O-band 1260~1360nm, E-band 1360~1460nm, S-band 1460~1530nm, C-band 1530~1565nm, L-band 1565~1625nm, U-band 1625~1675nm, as well as other longer or shorter communication bands that have evolved.
8. A high-resolution optical performance monitoring method based on an arrayed waveguide grating, characterized in that, The method is implemented using the high-resolution optical performance monitoring device based on an arrayed waveguide grating as described in any one of claims 1 to 7, and the method includes: When the original signal light enters the device through the optical input terminal (101), the optical switch (102) connects to the initial input channel of the arrayed waveguide grating (103). The m output channels of the arrayed waveguide grating (103) generate the first group of signals, which contains m signal units. The first group of signals is collected by the photodetector array (105) and transmitted to the data processing circuit (106). The data processing circuit 106 sends instructions to the control circuit (107), and the control circuit (107) controls the optical switch (102) to sequentially switch the remaining n-1 input channels of the array waveguide grating (103) so that the data processing circuit (106) can acquire the second to nth groups of signals collected by the photodetector array (105). The data processing circuit (106) acquires a total of n sets of signals, totaling n×m signal units. Since the spectrum of the arrayed waveguide grating (103) is known, the n×m intensity values of the original signal light entering the optical input terminal (101) can be calculated, thereby restoring the spectrum of the original signal light.
9. The high-resolution optical performance monitoring method based on arrayed waveguide gratings according to claim 8, characterized in that, During the acquisition of all n×m signal units, the data processing circuit (106) sends an instruction to the control circuit (107) to control the frequency adjustment unit (104) to keep the spectral frequency of the arrayed waveguide grating (103) unchanged. If the required monitoring resolution is high, the frequency adjustment unit (104) can be controlled by the control circuit (107) to cause the spectrum of the arrayed waveguide grating (103) to undergo p frequency shifts. After each frequency shift, the data processing circuit (106) will acquire another n×m signal units, for a total of (p+1)×n×m signal units, which means the resolution is p+1 times the original.