Recirculating photonic filter: a wavelength-selective time delay for phased-array antennas and wavelength code-division multiple access

Yegnanarayanan, Siva; Trinh, P.D.; Jalali, Bahram

doi:10.1364/ol.21.000740

Cited by 58 publications

(29 citation statements)

References 5 publications

(8 reference statements)

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“…Coppinger and co-workers proposed a different alternative based on the use of an array waveguide grating (AWG) device as a wavelength selective true time delay device [31][32][33]. The principle is shown in Figure 8.15 for a simple two-stage discretely tuneable notch filter.…”

Section: Fibre Delay Line Filtersmentioning

confidence: 99%

Microwave Photonic Signal Processing

Iezekiel

2009

Microwave Photonics

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The full exploitation of the advantages that radio frequency, microwave and millimetre-wave technologies bring to broadband telecommunications and other related applications requires a coordinated effort in the development of signal processing techniques suitable for them. This is especially important as novel applications demand the use of increasingly higher-frequency carriers and broadband signals.The traditional approach towards radio frequency (RF) signal processing is illustrated in the upper part of Figure 8.1. Here an RF signal originating from an RF source or coming from an antenna is fed to an RF circuit that performs the signal processing tasks either at the RF signal or at an intermediate frequency band after a down-conversion operation. In any case, the RF circuit is capable of performing the signal processing tasks for which it has been designed only within a specified (often reduced) spectral band. This approach results in poor flexibility since changing the band of the signals to be processed requires the design of a novel RF circuit and possibly the use of different hardware technology. Furthermore, even if the RF carrier is not changed, the nature of the modulating signal might be, thus requiring more bandwidth or sampling speed from the processor. This is especially true in the case where discrete time signal processing has to be carried over the RF signal. This set of drawbacks is often termed in the optical communications technology literature as the electronic bottleneck. Although important it is by no means the only source of degradation, since electromagnetic interference (EMI) and frequency dependent losses can also be sources of major impairments.An interesting approach to overcome the above limitations involves the use of photonics technology and especially fibre and integrated optics devices and circuits to perform the Microwave Photonics: Devices and Applications Edited by Stavros Iezekiel

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Section: Fibre Delay Line Filtersmentioning

confidence: 99%

Microwave Photonic Signal Processing

Iezekiel

2009

Microwave Photonics

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“…The fiber dispersion prism architecture has been proved in different practical realizations for 1D and 2D arrays [13,15,16]. Moreover, another interesting wavelength-selective architecture, proposed in [17], is based on the spectral periodicity of arrayed waveguide gratings arranged on a recirculating configuration. The VPVL approach allows the continuous beam-steering.…”

Section: Introductionmentioning

confidence: 99%

The Design of an Optical Time Steered Antenna Based on a New Integrated True Time Delay Unit

Capozzoli¹,

Curcio²,

D’Elia³

2013

PIER

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Abstract-In the framework of wide-band and ultra wide-band array antennas, an Optical Time Steered Antenna (OTSA) is presented, by considering the design strategies of a new True Time Delay (TTD) Control Unit in the Beam Forming Network (BFN). The unit has high reliability, low crosstalk, low switching time and potential low cost, being based on a low cost technology. Furthermore, due to its compactness and modularity, it can be easily grouped with other ones to make a control unit of large arrays. Different strategies and working configurations of the TTD control unit are presented as a trade-off among hardware complexity, insertion loss reduction and beam control capability. The design of an OTSA prototype is discussed by considering a realistic model simulating the behavior of a real world antenna and accounting for unavoidable non-realities, such as random, periodic and systematic errors introduced by each device exploited in the OTSA as well as mutual coupling between radiating elements. An optimal trimming strategy, able to compensate at best for BFN errors and based on the use of suitably located trimmers, is presented. Among other cases, to enlighten the potentialities of the OTSA, an all optical architecture providing a difference beam squint free pattern is also proposed.

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“…Recently, we proposed a key technique to enable optical control of wide-band arrays, using a novel single-chip switchless photonic time-delay device, where the microwave time-delay is selected by the optical wavelength [4], [5]. Since all the optical energy is self routed to the desired time delay, this technique can Manuscript easily scale to large arrays.…”

Section: Introductionmentioning

confidence: 99%

“…A tunable laser is used to select the time-delay through each stage. Each stage consists of a wavelength-selective time-delay [4]. There is no optical electrical optical conversion between the azimuth and elevation control stages.…”

Section: Introductionmentioning

confidence: 99%

Wavelength-selective true time delay for optical control of phased-array antenna

Yegnanarayanan

Jalali

2000

IEEE Photon. Technol. Lett.

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Performance of an optically controlled phased-array antenna system employing novel single-chip optical wavelength selective true time-delay devices is reported. High-resolution timedelays are demonstrated using integrated delay lines. Extension to two-dimensional (2-D) antenna arrays with independent control of azimuth and elevation by using mid-stage optical wavelength conversion is proposed and demonstrated. An optical true-time-delay steered two-element -band antenna was assembled to verify the wide instantaneous bandwidth operation.Index Terms-Optically controlled beam steering, phased-array antenna, true time delay.

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Recirculating photonic filter: a wavelength-selective time delay for phased-array antennas and wavelength code-division multiple access

Cited by 58 publications

References 5 publications

Microwave Photonic Signal Processing

Microwave Photonic Signal Processing

The Design of an Optical Time Steered Antenna Based on a New Integrated True Time Delay Unit

Wavelength-selective true time delay for optical control of phased-array antenna

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