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By suppressing the additive phase noise induced by light scattering in the optical fiber and optical interference due to the optical reflection in a microwave phase noise measurement system using photonic-delay based frequency discriminator, the sensitivity improvement of 10 dB is experimentally achieved. Using the proposed measurement scheme, a single sideband phase noise is measured to be −145 dBc/Hz...
A 10 GS/s photonic sub-sampling ADC is proposed and experimentally demonstrated. The single-sideband phase noise of the optoelectronic oscillator is tested to be −128 dBc/Hz at 10 kHz offset and the aperture jitter of the photonic ADC is 40.3 fs with the integral interval from 1 kHz to 10 MHz. 23 GHz and 43.1 GHz signals are sampled by the system with the ENOB of 5.0 bits and 4.2 bits.
10 GHz repetition rate, low timing-jitter and broadband optical comb generation based on a low phase noise optoelectronic oscillator is experimentally demonstrated. 10 GHz repetition rate optical comb and 10 GHz RF signal are obtained, simultaneously. A timing-jitter of 52.8 fs (integral range from 100 Hz to 1 MHz) for the optical comb and a phase noise of −132 dBc/Hz at 10 kHz offset for the RF signal...
The influence of optical interference induced by reflection of photodiode on the phase noise of optoelectronic oscillator is experimentally investigated. The phase noise at 10-kHz offset is improved by 18-dB through optical interference suppression.
A novel method for high frequency microwave phase noise measurement by photonic microwave down-conversion based on an optoelectronic oscillator is proposed and experimentally demonstrated. The measurement of single-sideband phase noise of the 10–12 GHz microwave signals under test are obtained. The phase noise floor of the measurement system is −140 dBc/Hz at 10 kHz offset.
A dual-loop optoelectronic oscillator (OEO) based on stimulated Brillouin scattering (SBS) is experimentally demonstrated. Two lasers are utilized to realize the tunability of the OEO. One acts as the signal laser, the other is employed as the pump laser. By directly tuning the wavelength of the pump laser, a widely tunable range from dc to 60 GHz for the RF signal generation can be obtained. To the...
50 GHz repetition rate optical frequency comb with very low phase noise is experimentally demonstrated by incorporating an optical frequency comb generator (OFCG) in an optoelectronic oscillator (OEO). To the best of our knowledge, this is the highest repetition rate optical frequency comb ever achieved by an OFCG. What more important is that, the OFCG is driven by the 50 GHz millimeter-wave signal...
We demonstrate a record widely tunable dual-loop optoelectronic oscillator with tunable band from 3.39 to 57.50 GHz. The single-side band phase noise is below −120 dBc/Hz at 10 kHz offset for all the measurement frequency points.
An approach to generating 60 GHz millimeter-(mm-) wave carrier based on four-wave mixing (FWM) effect is experimentally demonstrated. The FWM effect is generated in a slave DFB laser which is injection locked by the side band of a modulated tunable DFB laser. The optically generated mm-wave carrier has a frequency of 60 GHz with a 3 dB-bandwidth less than 30 Hz and a phase noise less than -95 dBc/Hz...
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