Array oscillator in coupled waveguides with nonlinear gain and radiation resistances saturating at exceptional point
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| Main Authors: | , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866917910900899840 |
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| author | Nikzamir, Alireza Herrero-Parareda, Albert Furman, Nathaniel Bradshaw, Benjamin Saavedra-Melo, Miguel Capolino, Filippo |
| author_facet | Nikzamir, Alireza Herrero-Parareda, Albert Furman, Nathaniel Bradshaw, Benjamin Saavedra-Melo, Miguel Capolino, Filippo |
| contents | A periodically loaded waveguide composed of periodic discrete nonlinear gain and radiating elements supports a stable oscillation regime related to the presence of an exceptional point of degeneracy (EPD). After reaching saturation, the EPD in the system establishes the oscillation frequency. We demonstrate a synchronization regime at a stable oscillation frequency, resulting in uniform saturated gain across the array and uniform radiating power. Unlike conventional one-dimensional cavity resonances, the oscillation frequency is independent of the array length. Our investigations further show that when small-signal gain is non-uniformly distributed across the array, the saturated gain results in having a uniform distribution at a gain value that generates an EPD. Experimental validation using the measured board confirmed that the system saturates at an EPD, with a measured spectrum exhibiting very low phase noise. This low noise allows for operation at a clean oscillation frequency. Additionally, the measured uniform power across the array corresponds to the simulation results. The proposed scheme can pave the way for a new generation of high-power radiating arrays with distributed active elements. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2501_14978 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Array oscillator in coupled waveguides with nonlinear gain and radiation resistances saturating at exceptional point Nikzamir, Alireza Herrero-Parareda, Albert Furman, Nathaniel Bradshaw, Benjamin Saavedra-Melo, Miguel Capolino, Filippo Applied Physics A periodically loaded waveguide composed of periodic discrete nonlinear gain and radiating elements supports a stable oscillation regime related to the presence of an exceptional point of degeneracy (EPD). After reaching saturation, the EPD in the system establishes the oscillation frequency. We demonstrate a synchronization regime at a stable oscillation frequency, resulting in uniform saturated gain across the array and uniform radiating power. Unlike conventional one-dimensional cavity resonances, the oscillation frequency is independent of the array length. Our investigations further show that when small-signal gain is non-uniformly distributed across the array, the saturated gain results in having a uniform distribution at a gain value that generates an EPD. Experimental validation using the measured board confirmed that the system saturates at an EPD, with a measured spectrum exhibiting very low phase noise. This low noise allows for operation at a clean oscillation frequency. Additionally, the measured uniform power across the array corresponds to the simulation results. The proposed scheme can pave the way for a new generation of high-power radiating arrays with distributed active elements. |
| title | Array oscillator in coupled waveguides with nonlinear gain and radiation resistances saturating at exceptional point |
| topic | Applied Physics |
| url | https://arxiv.org/abs/2501.14978 |