A Precisely Frequency-Tunable Parity-Time-Symmetric Optoelectronic Oscillator

Ding, Qi; Wang, Muguang; Zhang, Jing; Mu, Hai‐Bao; Wang, Chuncan; Fan, Guofang

doi:10.1109/jlt.2020.3014265

Cited by 15 publications

(7 citation statements)

References 32 publications

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“…Previous PT -OEOs that utilize a single PD have complicated schemes, such as implementing dual Mach-Zehnder modulators, dual lasers and micro-disk resonators. [25,26,[28][29][30][31]. Thus, the all-fiber coupled PT -OEO we demonstrate below is both a cost-efficient and a simple alternative.…”

Section: Introductionmentioning

confidence: 84%

“…This is achieved via forcing an equal gain/loss PT -symmetric system to go under SSB. 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 nonreciprocal electro-optic modulation [31] are among those.…”

Section: Introductionmentioning

confidence: 99%

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

Özgün¹,

Uyar²,

Kartaloğlu³

et al. 2022

J. Opt.

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In this manuscript, we experimentally demonstrate a parity-time-symmetric optoelectronic oscillator with polarization multiplexed channels. We obtained a microwave single-mode oscillation at 9.5 GHz with phase noise values of -116.2 dBc/Hz and -122.3 dBc/Hz at 10 kHz offset frequencies, and side mode suppression values below -68 dBc/Hz and -75 dBc/Hz, by utilizing a 1 km long and 5 km long single mode fiber delay lines, respectively. Our experimental results suggest that parity-time-symmetric optoelectronic oscillators with polarization multiplexed channels are simple and cost-efficient alternatives to their more complex counterparts.

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Section: Introductionmentioning

confidence: 84%

Section: Introductionmentioning

confidence: 99%

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

Özgün¹,

Uyar²,

Kartaloğlu³

et al. 2022

J. Opt.

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show abstract

“…Recently, parity‐time (PT) symmetry breaking has been proven as a powerful mode selection mechanism to achieve single‐mode oscillation 13 – 18 In a spatial PT‐symmetric OEO, two mutually coupled optoelectronic feedback loops are identical in geometry, but one experiences gain while the other experiences an equal amount of loss. To ensure that PT symmetry is successfully established to perform mode selection, the geometry of the two coupled loops must be perfectly matched and the gain, loss, and coupling coefficients between the two coupled loops can be manipulated.…”

Section: Introductionmentioning

confidence: 99%

“…Nevertheless, PT-symmetric OEOs mentioned above are constructed based on discrete devices, and suffer from being bulky systems, having high costs, and being sensitive to environmental fluctuations 13 – 17 Specifically, the photonic integrated circuits (PICs) pave the way for the emerging integrated microwave photonics (IMWP). The IMWP is superior in size, weight, power, and cost (SWaP‐C) 19 …”

Section: Introductionmentioning

confidence: 99%

On-chip tunable parity‐time symmetric optoelectronic oscillator

Wang

Xiao²,

Xu³

et al. 2023

Adv. Photon. Nexus

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Parity-time (PT) symmetry breaking offers mode selection capability for facilitating single-mode oscillation in the optoelectronic oscillator (OEO) loop. However, most OEO implementations depend on discrete devices, which impedes proliferation due to size, weight, power consumption, and cost. In this work, we propose and experimentally demonstrate an on-chip tunable PT-symmetric OEO. A tunable microwave photonic filter, a PT-symmetric mode-selective architecture, and two photodetectors are integrated on a silicon-on-insulator chip. By exploiting an on-chip Mach-Zehnder interferometer to match the gain and loss of two mutually coupled optoelectronic loops, single-mode oscillation can be obtained. In the experiment, the oscillation frequency of the on-chip tunable PT-symmetric OEO can be tuned from 0 to 20 GHz. To emulate the integrated case, the OEO loop length is minimized, and no extra-long fiber is used in the experiment. When the oscillation frequency is 13.67 GHz, the single-sideband phase noise at 10-kHz offset frequency is −80.96 dBc∕Hz and the side mode suppression ratio is 46 dB. The proposed on-chip tunable PT-symmetric OEO significantly reduces the footprint of the system and enhances mode selection.

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“…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.…”

mentioning

confidence: 99%

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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A Precisely Frequency-Tunable Parity-Time-Symmetric Optoelectronic Oscillator

Cited by 15 publications

References 32 publications

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

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

On-chip tunable parity‐time symmetric optoelectronic oscillator

Four-channel parity-time symmetry

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