Noise Comparison of RF Photonic Filters Based on Coherent and Incoherent Multiwavelength Sources

Abstract

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Optical frequency comb technology for ultra‐broadband radio‐frequency photonics

“…Regarding noise performance, because the taps are narrow‐linewidth, they do not generate the undesired beat noise terms observed in experiments based on spectral slicing of broadband incoherent light . In a recent experiment , a microwave photonic filtered link implemented with an opto‐electronic comb source has shown a noise performance close to that achievable with a single narrow‐linewidth laser. It is important to note that any MWP filter based on an FIR multi‐wavelength dispersive delay‐line geometry will have a spur‐free operation range given by half the frequency spacing.…”

Sidelobe Suppression Enhancement of Radiofrequency Photonic Filters via Time-to-frequency Mapping

“…The spectral slicing enables a MWP filter with a large number of taps [8], but the stochastic nature of the optical source leads to limited noise performance [9]. Recently, delay-line MWP filters based on high-repetition-rate optical frequency combs (OFCs) [10] have been explored [11]; these are easy to scale to a high number of taps while providing optical frequency stability, flexibility in tuning, and a coherence level not attainable from other sources.…”

Interference suppression and tunability enhancement for OFC-based simultaneous microwave down-conversion and filtering

“…Recently, a novel method based on optical frequency comb (OFC) was proposed as an alternative [6]. OFC is considered as a promising multi-wavelength source to build microwave photonics filter (MPF) for large number of coherent spectral lines [7][8][9][10]. Moreover, these coherent tones can also perform as local oscillator (LO) signals, offering the possibility of accomplishing down-conversion simultaneously [6] [11].…”