Single and double amplified recirculating delay lines as fibre-optic filters

Vázquez, Carmen; Vizoso, B.; López-Amo, Manuel; Muriel, Miguel A.

doi:10.1049/el:19920646

Cited by 42 publications

(9 citation statements)

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“…Various optical delay-line configurations have been proposed to achieve different radio-frequency (RF) filter functions. These configurations can be either optically coherent [2], [3] or incoherent [4]- [6]. Coherent optical processing allows more flexibility in shaping of the filter-transfer function because negative tap weights are possible.…”

Section: Introductionmentioning

confidence: 99%

All-optical RF filter using amplitude inversion in a semiconductor optical amplifier

Coppinger

Yegnanarayanan

Trinh

et al. 1997

IEEE Trans. Microwave Theory Techn.

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Section: Introductionmentioning

confidence: 99%

All-optical RF filter using amplitude inversion in a semiconductor optical amplifier

Coppinger

Yegnanarayanan

Trinh

et al. 1997

IEEE Trans. Microwave Theory Techn.

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“…The DPAROD is a linear system with respect to intensity, so the calculation of the transfer function H ( 0 ) (with 11+ as the input and 12+ as the output, see lC 1 The definitions of the utilized parameters are as follows: yj, aj, and kj are the coupler fractional losses, the fiber attenuation, and the coupling ratio of the directional couplers, respectively, as indicated in Fig. 1, where j = 1 refers to coupler 1 and j = 2 refers to coupler 2.…”

Section: Novel Methods For Analysis Of a Double-amplified Recirculatinmentioning

confidence: 99%

Analysis of double-parallel amplified recirculating optical-delay lines

et al. 1994

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A novel method of analysis of double-parallel amplified recirculating optical-delay lines (DPAROD) is presented. The location of the maxima and the minima of the transfer function for this configuration is calculated and experimentally demonstrated. The influence of different parameters, such as the coupling coefficients, gains, lengths of the fiber loops and fractional losses of the directional couplers, on the shape of the transfer function are analyzed. Different measurements have been taken to verify this model. The potential application of these interconnected delay loops as filters is a reason for developing this method. lntroductionSingle, amplified recirculating optical-delay lines have been widely analyzed,ly2 showing their capability for the development of signal-processing functions such as filtering, pulse-train generation, conv~lution,~ and memo^-y.4 A higher degree of design flexibility can be achieved with more complex structures, such as the double-parallel amplified recirculating opticaldelay line (DPAROD),l which is depicted in Fig. 1.New features obtained with DPAROD allow one to reshape their frequency response. For instance, one can obtain a predetermined relative amplitude between the main and secondary maxima and minima of the frequency response of DPAROD. This performance may be fairly useful for filtering, when discrimination is made on the basis not only of the signal frequency, but also on its signal-to-noise ratio. Another application of the DPAROD may be in the field of fiber-optic sensors, owing to the dependence of the DPAROD response on the gain of the fiber loops. If the results to be shown are extrapolated to integrated optics, large free spectral ranges should be achieved with DPAROD, as compared with singlestructure configurations. ~revious reports have been made in the coherent analysis of a three-couplerThe authors are with the Departamento de Tecnología Fotónica, Escuela Técnica Superior de Ingenieros Telecomunicación, Universidad Politécnica de Madrid, Ciudad Universitaria, E-28040 Madrid, Spain.Received 9 February 1993; revision re ical So.configuration,5 while with our DPAROD only two couplers are needed. An incoherent analysis (i.e., we consider intensities rather than fields) of the DPAROD has been carried out. Our main interest lies in predicting the frequency-domain location of the maxima-minima and the shape of the transfer function, we have developed a new model to do so. Some experimental results are also shown. Novel Method for Analysis of a Double-Amplified Recirculating Optical-Delay LineTo describe the signal in fiber-optic recirculating delay lines one usually utilizes the Z t r a n~f o r m .~ This usage is possible as long as a basic time delay T can be defined such that the other relevant system delays are integer multiples of this basic delay, and the system can be considered discrete in time. Such is the case in the single-structure configuration,ly2 or in Nth-order fiber-optic lattice structures, where the delay T is the same for al1 se~tions.~ This is n...

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“…4(a)], and identifying a generic electrical phase-shift with the characteristic transit time of an equivalent digital filter [21], [22], , the output response can be expressed in the Z-Transform domain as follows: (12) being (13) (14) where , are the modulation efficiency constants at the reference and sensor wavelengths for channel , respectively. The expression of the output phase corresponding to sensor at angular frequency is (15) For a fixed value of the modulation frequency, the parameter , namely single-frequency self-referencing parameter, depends only on the ratio-metric parameter , which is insensitive to external power fluctuations that might take place in the optical path between the sensing point and the CO, thus performing as a self-reference measurement parameter.…”

Section: B Digital Filter Modelmentioning

confidence: 99%

Radio-Frequency Self-Referencing Technique With Enhanced Sensitivity for Coarse WDM Fiber Optic Intensity Sensors

Montalvo

Frazão

Santos

et al. 2009

J. Lightwave Technol.

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Abstract-A self-referenced passive optical network (PON) with coarse wavelength division multiplexing (CWDM) is reported for remotely addressing optical intensity sensors with enhanced sensitivity. The self-referencing remote configuration is described as a finite-impulse-response (FIR) filter in reflective operation using two fiber Bragg gratings (FBG) and a fiber delay line. The antisymmetrical phase response of the configuration permits to achieve a self-referencing measurement parameter two times more sensitive than reported previously. To enhance the power budget of the network, CWDM devices with low insertion losses are used for spectral splitting of a radio-frequency (RF) modulated broadband light source (BLS). The network topology and the sensor's interrogation technique are theoretically analyzed and experimental results validating the models are reported.Index Terms-Coarse wavelenght-division multiplexing (CWDM), digital filters, fiber Bragg gratings (FBG), fiber delay lines, optical intensity sensors, passive optical networks (PON), self-reference.

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Single and double amplified recirculating delay lines as fibre-optic filters

Cited by 42 publications

References 0 publications

All-optical RF filter using amplitude inversion in a semiconductor optical amplifier

All-optical RF filter using amplitude inversion in a semiconductor optical amplifier

Analysis of double-parallel amplified recirculating optical-delay lines

Radio-Frequency Self-Referencing Technique With Enhanced Sensitivity for Coarse WDM Fiber Optic Intensity Sensors

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