A parity-time-symmetric optoelectronic oscillator with polarization multiplexed channels

Özgün, Ege; Uyar, Faruk; Kartaloğlu, Tolga; Özbay, Ekmel; Özdür, İbrahim

doi:10.1088/2040-8986/ac5ecf

Cited by 3 publications

(3 citation statements)

References 33 publications

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“…Then in a series of papers, Mostafazadeh generalized the idea and theoretically demonstrated that the Hamiltonians belonging to the class of pseudo-Hermitian Hamiltonians display real spectrum and PT -symmetric Hamiltonians also belong to that class [2][3][4]. Following the theoretical achievements, PT symmetry has found numerous applications, including implementations in optical systems [5][6][7], waveguides [8] and single-mode lasers [9], study of polarization depending scattering in photonic systems [10] and scattering in spin-1/2 systems in quantum mechanics [11], implementations in coupled RLC circuits [12] and optoelectronic oscillators (OEO)s [13,14]. Recently, a generalized four-channel PT symmetry scheme was theoretically suggested for the equal loss/gain setting, that utilizes two different coupling constants [15].…”

Section: Introductionmentioning

confidence: 99%

“…This is achieved via forcing an equal GL PT -symmetric system to go under SSB. A multitude of studies followed the first PT -OEO demonstration: A PT -OEO based on dual wavelength carriers in a single loop configuration [25], tunable PT -OEOs based on dual-parallel Mach-Zehnder modulator [26], based on laser wavelength tuning [27], based on a microdisk resonator [28], based on a microwave photonic filter [29], a polarization-dependent Sagnac loop [30] and polarization multiplexing [31] are among those.…”

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confidence: 99%

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Four-channel parity-time symmetry

Özgün¹,

Özbay²,

Özdür³

2022

EPL

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In this letter, we propose a general scheme for four-channel parity-time symmetry. We theoretically demonstrate how to achieve novel features via exploiting the parity-time symmetry for four-channel coupled-mode equations and study the spontaneous symmetry breaking manifold, separating the parity-time symmetric and parity-time broken regimes, for various parameter conﬁgurations. We also propose a possible candidate (an optoelectronic oscillator) which can demonstrate the theoretically derived features, which include, broadband tunability, eigenfrequency selection and ﬂipping, and single/dual frequency operation regimes.

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Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

Four-channel parity-time symmetry

Özgün¹,

Özbay²,

Özdür³

2022

EPL

Self Cite

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“…Scattering from complex non-Hermitian potentials with PT -symmetry is studied in another theoretical work, with discussions on unidirectional properties and reciprocity [3]. Following the theoretical achievements, PT -symmetry has found numerous applications, including implementations in optical and photonic systems [4][5][6][7][8][9], in a single spin system [10], in Floquet systems [11], waveguides [12] and single-mode lasers [13], study of polarization-depending scattering in photonic systems [14] and scattering in spin-1/2 systems in quantum mechanics [15], implementations in coupled RLC circuits [16] and optoelectronic oscillators (OEOs) [17,18]. Recently, a generalized four-channel PTsymmetry scheme was theoretically suggested for the equal loss/gain setting, that utilizes two different coupling constants [19].…”

mentioning

confidence: 99%

N-channel parity-time symmetry

Özgün

2023

EPL

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We calculated the eigenvalues for a general N-channel coupled system with parity-time symmetry due to equal loss/gain. We found that the eigenspectrum displays a mixing of parity-time symmetric and broken phases, with N −2 of the eigenvalues being parity-time broken whereas the remaining two being either parity-time symmetric or broken depending on the loss/gain and coupling parameters. Our results also show that mixing of parity-time symmetric and parity-time broken phases can only be obtained for at least four-channels if other degrees of freedom such as polarization or spin are not taken into account.

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Ultralow-phase-noise and broadband frequency-hopping coupled optoelectronic oscillator under quiet point operation

Liu,

Guo,

Zhang

et al. 2024

Photon. Res.

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Advancements in microwave photonics have yielded novel approaches for generating high-purity microwave sources. Among these, optoelectronic oscillators (OEOs) and coupled optoelectronic oscillators (COEOs) have demonstrated the capability to generate frequency-independent microwaves with exceptionally low phase noise. Nonetheless, the tunability of the oscillators is rather limited due to the necessity for narrowband electronic bandpass filters, presenting challenges in achieving both wide and rapid tuning capabilities. Here, we present a COEO featuring ultralow phase noise, flexible tuning capability, and high robustness. This is achieved through a quiet point (QP)-operated harmonic mode-locked fiber laser, which effectively mitigates optical amplifier noise and supermode competition, thus significantly diminishing the necessity for ultra-narrow electronic filters. Due to the liberated tuning ability, we present an oscillator that can be tuned from 2 GHz to 18 GHz, with phase noise as low as −140 dBc/Hz at 10 kHz under the QP operation. We then illustrate the practical application of the proposed oscillator in generating frequency-hopping signals with consistent spurious modes less than −85 dBc, absolute phase noise below −135 dBc/Hz at 10 kHz, hopping resolution of 1.25 MHz, and fractional frequency stability below 6.1×10−12 at 1 s averaging time when locked to a reference. The presented COEO structure emerges as a compelling solution for agile and low-noise microwave sources in advanced wireless communication and radar systems.

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A parity-time-symmetric optoelectronic oscillator with polarization multiplexed channels

Cited by 3 publications

References 33 publications

Four-channel parity-time symmetry

Four-channel parity-time symmetry

N-channel parity-time symmetry

Ultralow-phase-noise and broadband frequency-hopping coupled optoelectronic oscillator under quiet point operation

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