Article

Study of transmission response of edge filters employed in wavelength measurements

Applied Optoelectronics Centre, School of Electronics and Communications Engineering, Dublin Institute of Technology, Kevin Street, Dublin 8, Ireland.
Applied Optics (Impact Factor: 1.78). 01/2006; 44(36):7789-92. DOI: 10.1364/AO.44.007789
Source: PubMed

ABSTRACT

The ratiometric wavelength-measurement system is modeled and an optimal design of transmission response of the employed edge filter is demonstrated in the context of a limited signal-to-noise ratio of the signal source. The corresponding experimental investigation is presented. The impact of the limited signal-to-noise ratio of the signal source on determining the optimal transmission response of edge filters for a wavelength-measurement application is shown theoretically and experimentally. (c) 2005 Optical Society of America.

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    • "One can see that as the slope of the edge filter increases, the output ratio deviates from the edge filter transmission curve, thus it can not be used as a wavelength discriminator in the wavelength region near 1600 nm. It is caused by the noise of the input signal as verified experimentally in Ref. [7] "
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    ABSTRACT: An edge filter-based ratiometric wavelength measurement system is modeled and analyzed in this paper. The results confirm that the noise of input signal and photodetectors limits the resolution of the wavelength measurement system. The achievable resolution is calculated for a given noise level of the input signal and photodetectors' resolution. An improved ratiometric wavelength measurement system consisting of two fiber comb filters is presented both theoretically and experimentally, which performs coarse and fine wavelength measurements simultaneously. The resolution of the system is significantly improved to better than 5 pm while maintaining the potential for high measurement speed and wide measurable wavelength range.
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    • "However, if the comb filters scheme shown in Fig. 1a is used (with a free spectral range (FSR) of 20 nm and a discrimination of 10 dB), the resolution can be improved by an order of magnitude. Fig. 2 shows the calculated output ratio [7] assuming that the wavelength of the input signal shifts by 5 pm at 1556 nm. With the modified system, resolutions better than 5 pm can be achieved. "
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    ABSTRACT: An improved ratiometric wavelength measurement system incorporating two fibre comb filters is presented, which performs both rough and fine wavelength measurements simultaneously. The resolution of the system is significantly improved, compared to a single edge filter system, to better than 5 pm while maintaining the potential for high measurement speed and wide measurable wavelength range.
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    • "where the signal is assumed to have a Gaussian power spectral density with a -3dB spectral width ∆λ 0 and centre wavelength λ 0 . The parameter SNR is the signal-to-noise ratio of the optical signal, and Ω is determined by the nature of the optical source with a given noise level, which can be expressed as [9] "
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    ABSTRACT: This paper provides a straightforward design method for achieving a maximum wavelength resolution for an edge filter-based ratiometric system. An analysis of the influence of a range of factors on the resolution of the ratiometric wavelength measurement system was carried out. The investigation shows that, for a given input optical signal and when the working wavelength range is known, it is relatively straightforward to select an optimum slope for the edge filter that will yield a maximum resolution for the system. An experimental verification is carried out using a tunable laser and three macrobending fibre edge filters, with a good match between experimental and simulation results.
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