Optically-Injected-Semiconductor-Laser-Based Tunable Dual-Frequency Optoelectronic Oscillator under Subharmonic Microwave Modulation

To obtain low-phase-noise microwave signals with a widely tunable frequency range, an optoelectronic oscillator (OEO) was constructed on the basis of an optically injected semiconductor laser (OISL) for the generation of high-quality microwave signals. Our OEO relied on the effect of wavelength-selective amplification and the period-one (P1) oscillation under optical injection. The signal’s frequency stability, side-mode-suppression ratio (SMSR) and linewidth were optimized by the subharmonic microwave modulation technique in the OEO loop. The experimental results showed that the frequency of the signal obtained by the proposed OEO could be tuned up to 18 GHz. Using the dual-loop OEO structure, the SMSR was increased to 55 dB. Moreover, the phase noise of the obtained microwave signal was lower than −81 dBc/Hz at 1 kHz frequency offset and −119 dBc/Hz at 10 kHz frequency offset. This was achieved by introducing subharmonic microwave modulation in the OEO loop, respectively. Furthermore, via the utilization of a Fabry–Perot laser diode (FP-LD) in the proposed structure, a dual-loop OEO with different dual-frequency configurations (which could be tuned up to 12 and 18 GHz) was obtained.

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Coupled Dual-Loop Optoelectronic Oscillator Based on Stimulated Brillouin Scattering

Applied Sciences ◽

10.3390/app9102077 ◽

2019 ◽

Vol 9 (10) ◽

pp. 2077

Author(s):

Feng Fan ◽

Wenwu Zhu ◽

Jiabin Wang ◽

Jingjing Hu ◽

Yiying Gu ◽

...

Keyword(s):

Phase Noise ◽

Brillouin Scattering ◽

Stimulated Brillouin Scattering ◽

Optoelectronic Oscillator ◽

Intensity Modulator ◽

Mode Suppression ◽

Single Output ◽

Optical Output ◽

Microwave Signals ◽

Stimulated Brillouin

A tunable optoelectronic oscillator (TOEO) with coupled dual-loop (CDL) based on stimulated Brillouin scattering (SBS) is proposed. In our scheme, the CDL is constructed by cascading a dual-output Mach–Zehnder intensity modulator (DOMZM) and a single output Mach–Zehnder intensity modulator (MZM). One optical output of the DOMZM is directly injected to the MZM, and the other optical output of the DOMZM is transformed into microwave signals to modulate the MZM. The narrow gain spectrum of SBS is used to select the oscillation frequency and realize frequency tunability. By joining the CDL, we can not only increase side mode suppression ratio (SMSR) and decrease phase noise, but also improve stability of the TOEO. Experimental results show that microwave signals from 2 GHz to 18 GHz with the SMSR as high as 60 dB and the phase noise as low as −95 dBc/Hz at 10 kHz frequency offset are achieved. Furthermore, the frequency drift is less than 0.3 ppm and the power drift is lower than 0.2 dB at 10 GHz within 30 min in lab condition.

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Acquiring narrow linewidth microwave signals based on an optical injection semiconductor laser under subharmonic microwave modulation

Acta Physica Sinica ◽

10.7498/aps.63.244204 ◽

2014 ◽

Vol 63 (24) ◽

pp. 244204

Author(s):

Mao Song ◽

Wu Zheng-Mao ◽

Fan Li ◽

Yang Hai-Bo ◽

Zhao Mao-Rong ◽

...

Keyword(s):

Semiconductor Laser ◽

Optical Injection ◽

Narrow Linewidth ◽

Microwave Signals ◽

Microwave Modulation

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Optical Sideband Injection Locking Using Waveguide Based External Cavity Semiconductor Lasers for Narrow-Line, Tunable Microwave Generation

Photonics ◽

10.3390/photonics6030081 ◽

2019 ◽

Vol 6 (3) ◽

pp. 81 ◽

Cited By ~ 1

Author(s):

Md. Rezaul Hoque Khan ◽

Md. Ashraful Hoque

Keyword(s):

Phase Noise ◽

Semiconductor Lasers ◽

External Cavity ◽

Injection Locking ◽

Optical Injection ◽

Optical Cavities ◽

Microwave Generation ◽

Microwave Signals ◽

Tunable Frequency ◽

External Cavity Semiconductor Lasers

The generation by optical injection locking of spectrally unadulterated microwave signals using waveguide based external cavity semiconductor lasers (WECSL) is demonstrated. A tunable frequency of 2–11 GHz, limited by the modulator’s bandwidth and the photodetector (PD), was created as proof-of-experiment by the injection locking of the two WESCLs. A single sideband (SSB) phase noise of −75 dBc/Hz from the generated carrier at 10 kHz offset and a phase noise variance at an optimum injection ratio region was 0.03 rad2, corresponding to 1.7°, were observed. The main feature of this approach is the consolidation of the upsides of microwave generation at low phase noise with a broad tuning range and the capacity of hybrid photonic integration. In addition, the injection locking characteristics were used to determine the Q factor of the complicated optical cavities with unknown inner losses.

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