Integrated frequency comb source based Hilbert transformer for wideband microwave photonic phase analysis

Nguyen, Thach G.; Shoeiby, Mehrdad; Chu, Sai T.; Little, Brent E.; Morandotti, Roberto; Mitchell, Arnan; Moss, David

doi:10.1364/oe.23.022087

Cited by 154 publications

(123 citation statements)

References 32 publications

(21 reference statements)

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“…We also realised a range of other transfer functions [55][56][57][58][59][60] by programming different tap coefficients (Table 2), thus demonstrating a high degree of versatility in terms of center frequency and filter shape. Figure 10 shows four different filter types for microwave signal processing with shapes ranging from a half-band highpass filter, to a half-band lowpass filter, a band-stop filter, and a Nyquist filter.…”

Section: Highly Versatile Microwave Photonic Filtersmentioning

confidence: 99%

Advanced RF and microwave functions based on an integrated optical frequency comb source

et al. 2018

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Abstract:We demonstrate advanced transversal radio frequency (RF) and microwave functions based on a Kerr optical comb source generated by an integrated micro-ring resonator. We achieve extremely high performance for an optical true time delay aimed at tunable phased array antenna applications, as well as reconfigurable microwave photonic filters. Our results agree well with theory. We show that our true time delay would yield a phased array antenna with features that include high angular resolution and a wide range of beam steering angles, while the microwave photonic filters feature high Q factors, wideband tunability, and highly reconfigurable filtering shapes. These results show that our approach is a competitive solution to implementing reconfigurable, high performance and potentially low cost RF and microwave signal processing functions for applications including radar and communication systems.

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Section: Highly Versatile Microwave Photonic Filtersmentioning

confidence: 99%

Advanced RF and microwave functions based on an integrated optical frequency comb source

et al. 2018

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“…Such Kerr combs have been demonstrated to provide dozens to hundreds of comb lines at repetition rates of tens to hundreds of gigahertz (high repetition frequency is an advantage for RF photonic filtering) with low noise and high optical coherence. RF photonic filter experiments using Kerr combs generated from optical microresonators fabricated on silicon photonic chips have been reported in [55] and [56]; wavelength-division multiplexed coherent optical communications experiments have also been reported using combs generated from such chip-scale microresonators [57]. Tuning schemes for such Kerr combs, which are relevant to achieving RF filter tuning in RF photonic filter implementations, are now beginning to be explored [58].…”

Section: Discussionmentioning

confidence: 99%

Rapidly Tunable Dual-Comb RF Photonic Filter for Ultrabroadband RF Spread Spectrum Applications

Kim

Leaird

Weiner

2016

IEEE Trans. Microwave Theory Techn.

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Abstract-We demonstrate a rapidly frequency-tunable radio frequency (RF) filter using microwave photonics technology for ultrawideband RF spread spectrum applications. A pair of electro-optic frequency combs is arranged as a dispersive tapped delay line in a differential detection configuration to implement a programmable finite impulse response RF filter. Our photonic scheme enables both fast frequency tuning on the order of tens of nanoseconds and wide tuning range (>7.5 GHz) with minimal variation of RF gain and passband shape. The low control voltage (ca. 1 V) and the linear relationship between control voltage and passband frequency facilitate agile frequency tuning for processing of signals with time-varying frequency content, while differential detection increases the photocurrent by a factor of two and suppresses common mode intensity noise. We exploit the rapid tunability of the implemented filter to demonstrate dynamic tracking of frequency-hopped and chirped RF signals. An experiment that performs dynamic filtering of an input chirp signal (3.92-GHz center frequency, up-chirped by >2 GHz within 100 ns) obscured by strong broadband noise achieves ∼11-dB signal-to-noise ratio (SNR) improvement. The SNR obtained is in addition to that available from standard matched filtering or pulse compression processing, suggesting strong potential for enhanced resistance against broadband noise jamming.

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“…By simply programming the waveshaper to shape the comb lines according to the corresponding tap coefficients, our scheme can also apply to other computing functions such as Hilbert transforms and differential equation solving. 36,37 Note that the high reconfigurability of the proposed differentiator cannot typically be achieved by its passive silicon counterparts, 13-17 thus making our approach more suitable for diverse computing requirements in practical applications. The operation bandwidth can also be changed by adjusting the time delay between adjacent taps or employing different tap coefficients.…”

Section: Operation Principlementioning

confidence: 99%

“…To further investigate the imperfections associated with the device performance, we employed commercial software (VPI photonics) to simulate the RF amplitude and phase response of the various differentiators by considering the tap weight error during the comb shaping, the chirp induced by the MZM, and the third-order dispersion (TOD) of the fibre. Based on the measured error signal from the feedback control path and the empirical chirp/TOD values in previous experiments, 36 the tap weight error, chirp coefficient, and TOD in our simulation were set to 0.5 dB, 0.5, and 0.083 ps/(nm 2 km), respectively. The simulated amplitude and phase response are plotted in Figs.…”

Section: (B)-4(d)mentioning

confidence: 99%

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Reconfigurable broadband microwave photonic intensity differentiator based on an integrated optical frequency comb source

et al. 2017

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We propose and experimentally demonstrate a microwave photonic intensity differentiator based on a Kerr optical comb generated by a compact integrated micro-ring resonator (MRR). The on-chip Kerr optical comb, containing a large number of comb lines, serves as a high-performance multi-wavelength source for implementing a transversal filter, which will greatly reduce the cost, size, and complexity of the system. Moreover, owing to the compactness of the integrated MRR, frequency spacings of up to 200-GHz can be achieved, enabling a potential operation bandwidth of over 100 GHz. By programming and shaping individual comb lines according to calculated tap weights, a reconfigurable intensity differentiator with variable differentiation orders can be realized. The operation principle is theoretically analyzed, and experimental demonstrations of the first-, second-, and third-order differentiation functions based on this principle are presented. The radio frequency amplitude and phase responses of multi-order intensity differentiations are characterized, and system demonstrations of real-time differentiations for a Gaussian input signal are also performed. The experimental results show good agreement with theory, confirming the effectiveness of our approach.

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Integrated frequency comb source based Hilbert transformer for wideband microwave photonic phase analysis

Cited by 154 publications

References 32 publications

Advanced RF and microwave functions based on an integrated optical frequency comb source

Advanced RF and microwave functions based on an integrated optical frequency comb source

Rapidly Tunable Dual-Comb RF Photonic Filter for Ultrabroadband RF Spread Spectrum Applications

Reconfigurable broadband microwave photonic intensity differentiator based on an integrated optical frequency comb source

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