Microwave Photonic Notch Filter With Complex Coefficient Based on DDMZM

Li, Wei; Wang, Wen Ting; Wen, Sun; Liu, Jian Guo; Zhu, Ning Hua

doi:10.1109/lpt.2014.2320459

Cited by 8 publications

(6 citation statements)

References 23 publications

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“…In addition, full FSR-range tunability is hard to implement because of the difficulties to perform the full 360°phase shift. To remedy this, a full FSR range tunable microwave photonic filter with complex coefficients was proposed by using a PolM [282], [283], a dual-parallel MZM (DPMZM) [284], or a dual-drive MZM (DDMZM) [285]. As an example, Fig.…”

Section: Microwave Photonic Filteringmentioning

confidence: 99%

Microwave Photonic Radars

Pan

Zhang

2020

J. Lightwave Technol.

312

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As the only method for all-weather, all-time and longdistance target detection and recognition, radar has been intensively studied since it was invented, and is considered as an essential sensor for future intelligent society. In the past few decades, great efforts were devoted to improving radar's functionality, precision, and response time, of which the key is to generate, control and process a wideband signal with high speed. Thanks to the broad bandwidth, flat response, low loss transmission, multidimensional multiplexing, ultrafast analog signal processing and electromagnetic interference immunity provided by modern photonics, implementation of the radar in the optical domain can achieve better performance in terms of resolution, coverage, and speed which would be difficult (if not impossible) to implement using traditional, even state-of-the-art electronics. In this tutorial, we overview the distinct features of microwave photonics and some key microwave photonic technologies that are currently known to be attractive for radars. System architectures and their performance that may interest the radar society are emphasized. Emerging technologies in this area and possible future research directions are discussed.

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Section: Microwave Photonic Filteringmentioning

confidence: 99%

Microwave Photonic Radars

Pan

Zhang

2020

J. Lightwave Technol.

312

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“…The remaining term of the incoherent filter will always have positive coefficient which will limit the performance of the filter [2]. Additional manipulation such as dual modulation would then be required to realize complex coefficient MPF based on the incoherent scheme [2,27]. To investigate the coherence of different types of light source, here we discuss the degree of coherence of the signals from (a) single mode lasers, (b) MLM lasers, and (c) filtered white noise source.…”

Section: Iir-mpf and The Coherence Of Sourcementioning

confidence: 99%

Gigahertz single source IIR microwave photonic filter based on coherence managed multi-longitudinal-mode fiber laser

Jin¹,

Feng²,

Li³

et al. 2015

Opt. Express

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In this paper, we propose to use a multi-longitudinal-mode (MLM) laser as the source of an infinite-impulse response (IIR) microwave photonic filter (MPF) to obtain GHz level free spectral range (FSR). The response function of such an IIR-MPF and the degree of coherence of the laser are discussed theoretically. The degree of coherence of the MLM laser shows a periodic structure which is significantly different to that of single mode lasers. By engineering the degree of coherence of the MLM laser, we are able to control the stability of the IIR-MPFs with different Q factors. It is found that stable IIR-MPF with GHz level FSR can be realized with an MLM laser and its stability can be enhanced if the coherence of the laser is managed. Based on the theoretical analysis, we fabricate an IIR-MPF based on an MLM erbium doped fiber laser. The impacts of the mode spacing Δν and the bandwidth to the stability are investigated experimentally. A stable IIR-MPF with an FSR of 0.59 GHz is realized and the relative fluctuation of the response curve is optimized to be less than 2%. Besides stable response, the IIR-MPF is reconfigurable by tuning the central wavelength of the laser in a range of 20 nm.

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“…However, due to the large delay introduced by dispersive devices, the free spectral range (FSR) range is very small. Therefore, most of these filters [5][6][7] exhibit multiple passbands, or notches, in their operation bandwidth, which is disadvantageous for single band selection. In order to achieve single band selectivity, some single-bandpass or single-notch MPFs based on various optical components are proposed.…”

Section: Introductionmentioning

confidence: 99%

Tunable and flat single-notch microwave photonic filter with multi-wavelength optical source

Li¹,

Song²,

Tong³

et al. 2018

Laser Phys.

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A tunable and flat single-notch microwave photonic filter (SNMPF) with a multi-wavelength optical source is proposed and demonstrated. In the experiment, the multi-wavelength optical source is based on a tunable laser and a broadband optical source, which has the ability to achieve separate control of the first tap and secondary taps. Through a large number of tap amplitude tests and simulations, the filter can achieve a flat-passband; the passband ripples are smaller than 0.65 dB. The notch depth of the SNMPF is tuned by changing the amplitude of the first tap. The frequency of the SNMPF is continuously tuned by controlling the Fourierdomain optical processor to induce an additional phase, and the 3 dB bandwidth of the filter is tuned by controlling the waveshaper to adjust the number of taps. For simulation results, the depth of the SNMPF is tuned from −43 dB to −14.73 dB, the center frequency is tuned continuously from 0 GHz-74.488 GHz, the bandwidth with 10-taps is 3.54 GHz and the SNMPF has a flat-passband.

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Microwave Photonic Notch Filter With Complex Coefficient Based on DDMZM

Cited by 8 publications

References 23 publications

Microwave Photonic Radars

Microwave Photonic Radars

Gigahertz single source IIR microwave photonic filter based on coherence managed multi-longitudinal-mode fiber laser

Tunable and flat single-notch microwave photonic filter with multi-wavelength optical source

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