Tunable microwave filtering using high dispersion fiber time delays

Norton, Douglas A.; Johns, Steven T.; Keefer, Christopher W.; Soref, Richard A.

doi:10.1109/68.311469

Cited by 110 publications

(35 citation statements)

References 5 publications

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“…In 1994 a solution for resonance tuneability was proposed by implementing a tuneable delay consisting of a tuneable source and high dispersion fibre delay lines [29]. The concept was extended by Frankel and Esman [30] who demonstrated the implementation of a transversal filter with continuously tuneable unit time delays consisting of eight taps with progressively longer segments of high-dispersion fibre, but completed with dispersion-shifted fibre to nominally identical overall lengths.…”

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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“…where ϭ t Ϫ t 0 is the time delay difference; ⍀ ϭ 2f RF , f RF is the modulated frequency; ␤ is the second derivation of the propagation constant with respect to the frequency; A and B represent the filter coefficients, which can be set by adjusting the output power via the variable attenuators in order to guarantee a high-performance notch rejection [8]. When the RF signals in both arms are exactly out of phase, the filter has nulls and when the two signals are in phase, the filter has maxima.…”

Section: Measurement Techniquementioning

confidence: 99%

Group delay measurement of WDM components using photonic microwave technique

Yi¹,

Fang²,

Wang³

et al. 2002

Micro & Optical Tech Letters

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“…Tuning of the notch frequency can be carried out by changing the differential time delay between the two uncorrelated coherent light beams. The differential time delay can be introduced by using a variety of passive components such as chirped fiber Bragg gratings (FBGs) [7], high-birefringence optical fibers [8], and highly-dispersive optical fiber [9].…”

Section: Introductionmentioning

confidence: 99%