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Single- and dual-band dispersion compensation unit using apodized chirped fiber Bragg grating
In this study, a wideband dispersion compensation (WBDC) profile that effectively covers the entire C- and/or part of the L-band is designed and evaluated. Several apodizations with different apodization strengths applied to a chirp fiber Bragg grating (CFBG), different CFBG lengths ( L ), and diffe...
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Published in: | Journal of computational electronics 2018-03, Vol.17 (1), p.349-360 |
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Main Authors: | , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | In this study, a wideband dispersion compensation (WBDC) profile that effectively covers the entire C- and/or part of the L-band is designed and evaluated. Several apodizations with different apodization strengths applied to a chirp fiber Bragg grating (CFBG), different CFBG lengths (
L
), and different refractive index modulation amplitudes (
Δ
n
) are investigated during the design and evaluation process. The design and optimization processes target parameters including a maximum full width at half maximum (FWHM), minimum group delay ripples (GDR) and an acceptable reflectivity and sidelobe suppression ratio (SLSR). A wavelength shift of no more than 2 nm is observed as a result of investigating the effect of temperature in the WBDC scenario. During single-stage operation, the results shows that a hyper-tanh with
L
= 15 cm and
Δ
n
= 4e−4 is the optimum design choice that provides an FWHM of 36.9378 nm, a GDR of 0.85 ps, a reflectivity of
-
4.46706
dB and an SLSR of 42.08 dB. Optimization indicates that a tanh apodization with
L
=
15 cm and
Δ
n
=
4e−4 is the optimum choice for dual-stage operation that achieves an FWHM of 37.2244 nm, a GDR of 0.85 ps, a reflectivity of −5.36151 dB and an SLSR of 43.59 dB. Small variations in the SLSR level (e.g., 0.8 dB) are observed while investigating the effect of temperature on the dual-stage operation even in the worst-case operating scenario. |
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ISSN: | 1569-8025 1572-8137 |
DOI: | 10.1007/s10825-017-1096-2 |