Improving the Side-mode Suppression Ratio and Reducing the Frequency Drift in an Opto-Electronic Oscillator With a Feedback Control Loop and Additional Phase Modulation

Bogataj, Luka; Vidmar, M.; Batagelj, Boštjan

doi:10.1109/jlt.2015.2506614

Cited by 20 publications

(15 citation statements)

References 16 publications

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“…In this way the OEO's frequency is stabilized compared to an OEO without any feedback control loop. Using this method, a coefficient of 0.05 ppm/K was achieved [15]. This result is shown in Fig.…”

Section: A Feedback Control Loopmentioning

confidence: 81%

“…Commercial monolithic microwave integrated circuits (MMICs) were used as amplifiers. The free spectral range (FSR) was approximately 13 kHz [7], [15], [16].…”

Section: Electronic Stabilization Methodsmentioning

confidence: 99%

“…Besides the long-term frequency stability, the phase noise was also measured for two different configurations: an OEO with a feedback control loop and an OEO without a feedback control loop [15]. The results are shown in Fig.…”

Section: A Feedback Control Loopmentioning

confidence: 99%

“…To ensure the high side-mode suppression ratio (SMSR) of a single-loop OEO we proposed two different methods. One method uses an additional phase modulation of the oscillator's loop to increase the SMSR [15]. The other method decreases the loop's bandwidth with a quality multiplier, which is added to the bandpass filter [16].…”

Section: Introductionmentioning

confidence: 99%

“…All three methods are presented into detail elsewhere [7], [15], [16]. In this paper the basic principle of operation is given for all three methods in Section II, where the results are also presented.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Electronic stabilization methods for a single-loop opto-electronic oscillator

Ilgaz¹,

Bogataj²,

Batagelj³

et al. 2016

2016 46th European Microwave Conference (EuMC)

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The opto-electronic oscillator (OEO) is an oscillator with an optical delay line as a resonator. The fact that the increase in frequency of an OEO does not increase its phase noise is an important advantage. This enables the generation of low phase-noise signals in the microwave and millimeter wave regions. However, for its more widespread use two problems must be dealt with: frequency drift and multi-mode oscillation. This paper presents recently proposed, novel methods that address the frequency drift and the OEO's multi-mode nature. By implementing a feedback control loop into the OEO it is possible to achieve a frequency drift of 0.05 ppm/K. With an additional phase modulation of the OEO's loop it is possible to increase the side-mode suppression ratio (SMSR) by 5 dB, and a 20-dB improvement in the SMSR is possible with a quality multiplier. The suggested methods operate in the electrical domain, which makes them simple, accessible and low cost.

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Section: A Feedback Control Loopmentioning

confidence: 81%

“…Commercial monolithic microwave integrated circuits (MMICs) were used as amplifiers. The free spectral range (FSR) was approximately 13 kHz [7], [15], [16].…”

Section: Electronic Stabilization Methodsmentioning

confidence: 99%

Section: A Feedback Control Loopmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Electronic stabilization methods for a single-loop opto-electronic oscillator

Ilgaz¹,

Bogataj²,

Batagelj³

et al. 2016

2016 46th European Microwave Conference (EuMC)

Self Cite

View full text Add to dashboard Cite

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Deterministic Parity‐Time Symmetry Single‐Mode Oscillation in Filterless Multimode Resonators

Yang,

Liu,

Liu

et al. 2024

Laser & Photonics Reviews

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Parity‐time symmetry has great potential for mode selection in multimode resonators. However, in a PT‐symmetry system with saturable absorption mechanisms, the random background noise can initiate single‐mode oscillation at any of the maxima within the gain spectrum, that is, potential PT frequencies. Such randomness impedes the acquisition of high‐quality signals at desired frequencies. Here, this work proposes a method to obtain deterministic PT‐symmetry single‐mode oscillation in a filterless multimode resonator through one‐shot injection. With this technique, this work changes the system's gain spectrum and enhances the gain discrepancy. Utilizing the frequency domain saturable absorption of the resonator, oscillation at desired mode can maintain its frequency after the withdrawal of the injection signal. To validate the concept, this work establishes a polarization‐division multiplexed dual‐loop optoelectronic oscillator (OEO) with a 1‐km long cavity operated under PT‐symmetry conditions. By one‐shot injecting the PT‐OEO, this work effectively eliminates the randomness arising from the relatively flat gain spectrum, facilitating oscillation at any desired potential PT frequencies from 1.8 to 9 GHz without requiring elaborate frequency tuning structures. Moreover, the one‐shot injection technique produces ultra‐low phase noise performance, achieving a remarkable −158.6 dBc Hz−1@10 kHz. This performance level stands in close comparison with the best phase noise values recorded for OEOs.

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Experimental Investigation on the Side Mode Injection Locking of a Single-loop OEO under RF Signal Injection

Sarkar,

Banerjee,

Pacheco

et al. 2024

Analog Integr Circ Sig Process

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This article mainly focuses on the side mode injection locking phenomena when a single-loop optoelectronic oscillator (OEO) is under RF signal injection. The analyses are made regarding lock range, phase noise and locking time. Also, a comparative study has been prepared when the OEO is injection-locked in the first side and the main mode. We show that the lock range is smaller for injection-locked OEO in the first side mode than in the main mode. The phase noise performance of the OEO for both cases is also demonstrated. It is exhibited that the phase noise performance is better in the case of injection-locked OEO at first side mode, particularly in a strong injection regime. The transient behaviour is also approximated by measuring locking time in both cases. The lock range, phase noise and locking time dependency on optical fibre length have also been studied. Finally, we perform experiments to support our analytical findings developed earlier.

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Improving the Side-mode Suppression Ratio and Reducing the Frequency Drift in an Opto-Electronic Oscillator With a Feedback Control Loop and Additional Phase Modulation

Cited by 20 publications

References 16 publications

Electronic stabilization methods for a single-loop opto-electronic oscillator

Electronic stabilization methods for a single-loop opto-electronic oscillator

Deterministic Parity‐Time Symmetry Single‐Mode Oscillation in Filterless Multimode Resonators

Experimental Investigation on the Side Mode Injection Locking of a Single-loop OEO under RF Signal Injection

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