Q-factor of optical delay-line based cavities and oscillators
| Autor: | S. Esmail Hosseini, Azadeh Karimi, Sajad Jahanbakht |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Physics
Optical fiber business.industry 02 engineering and technology Function (mathematics) Lossy compression 01 natural sciences Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials law.invention 010309 optics Resonator 020210 optoelectronics & photonics Optics law Q factor 0103 physical sciences Line (geometry) 0202 electrical engineering electronic engineering information engineering Electrical and Electronic Engineering Physical and Theoretical Chemistry business Microwave Energy (signal processing) |
| Zdroj: | Optics Communications. 407:349-354 |
| ISSN: | 0030-4018 |
| DOI: | 10.1016/j.optcom.2017.09.077 |
| Popis: | In this paper a theoretical derivation of unloaded and loaded Q -factor of delay-line cavities, such as optical fiber delay-lines, and delay-line based oscillators, such as optoelectronic oscillators (OEOs), is presented based on three approaches: (I) second-order resonator approximation, (II) linear time-invariant phase-space model and (III) energy approach. Theoretical expressions for unloaded and loaded Q -factor of delay-line based cavities and oscillators are derived. We show that the Q -factor of a delay-line based cavity is a function of its round-trip time that is not equal to the energy decay-time of usual microwave or optical resonators. Hence, the behavior of the Q -factor of a delay-line based cavity will not be the same as that of the usual resonators. We show that the loaded Q -factor of a delay-line cavity is greater than its unloaded Q -factor!, besides we show that the Q -factor of a lossy delay-line cavity is the same as that of the lossless one! (in contrast to the behavior of the usual resonators). We also show that the Q -factor of a delay-line based oscillator is proportional to the half of the round-trip time of its delay line while the Q -factor of an oscillator based on a usual resonator is proportional to the energy decay time of its resonator. |
| Databáze: | OpenAIRE |
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