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Short-wavelength transmission-loss suppression in fibre Bragg gratings

Short-wavelength transmission-loss suppression in fibre Bragg gratings
Short-wavelength transmission-loss suppression in fibre Bragg gratings
Fibre Bragg Gratings (FBGs) are known to suffer from short-wavelength, transmission losses due to resonant coupling into backward-propagating cladding modes. Figure 1 shows a typical transmission spectrum of a 10cm standard FBG. The cladding mode losses increase with grating reflectivity and could eventually impose severe limitations in the use of FBGs. The problem can be quite acute in the case that FBG wavelength-multiplexing is requimd. So far, several attempts have been made to eliminate the short-wavelength, transmission losses and improve grating performance. In all cases, the resonant coupling of the forward-propagating core mode to the backward-propagating cladding modes is minimised by reducing the coupling strength. In this paper, we report on a novel method for reducing cladding-mode transmission losses in standard FBGs. We show that short-wavelength, transmission losses can be practically eliminated by damping the resonant excitation of the cladding modes. The damping is achieved by properly introducing a substantial propagation loss into the cladding modes. For maximum effect, the core mode should experience no extra propagation losses. By applying a thin lossy layer on the fibre cladding surface, a reduction of cladding-mode-losses of about 12dB was achieved
Zervas, M.N.
1840a474-dd50-4a55-ab74-6f086aa3f701
Ibsen, M.
22e58138-5ce9-4bed-87e1-735c91f8f3b9
Laming, R.I.
c86f359b-9145-4148-bc7d-ae4f3d272ca2
Zervas, M.N.
1840a474-dd50-4a55-ab74-6f086aa3f701
Ibsen, M.
22e58138-5ce9-4bed-87e1-735c91f8f3b9
Laming, R.I.
c86f359b-9145-4148-bc7d-ae4f3d272ca2

Zervas, M.N., Ibsen, M. and Laming, R.I. (1997) Short-wavelength transmission-loss suppression in fibre Bragg gratings. Bragg Gratings, Photosensitivity and Poling in Glass Waveguides (BGPP), United States. 26 - 28 Oct 1997.

Record type: Conference or Workshop Item (Paper)

Abstract

Fibre Bragg Gratings (FBGs) are known to suffer from short-wavelength, transmission losses due to resonant coupling into backward-propagating cladding modes. Figure 1 shows a typical transmission spectrum of a 10cm standard FBG. The cladding mode losses increase with grating reflectivity and could eventually impose severe limitations in the use of FBGs. The problem can be quite acute in the case that FBG wavelength-multiplexing is requimd. So far, several attempts have been made to eliminate the short-wavelength, transmission losses and improve grating performance. In all cases, the resonant coupling of the forward-propagating core mode to the backward-propagating cladding modes is minimised by reducing the coupling strength. In this paper, we report on a novel method for reducing cladding-mode transmission losses in standard FBGs. We show that short-wavelength, transmission losses can be practically eliminated by damping the resonant excitation of the cladding modes. The damping is achieved by properly introducing a substantial propagation loss into the cladding modes. For maximum effect, the core mode should experience no extra propagation losses. By applying a thin lossy layer on the fibre cladding surface, a reduction of cladding-mode-losses of about 12dB was achieved

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More information

Published date: 1997
Additional Information: Invited
Venue - Dates: Bragg Gratings, Photosensitivity and Poling in Glass Waveguides (BGPP), United States, 1997-10-26 - 1997-10-28

Identifiers

Local EPrints ID: 76724
URI: https://eprints.soton.ac.uk/id/eprint/76724
PURE UUID: 9601d48f-00dd-47f6-8561-f6c138d14655
ORCID for M.N. Zervas: ORCID iD orcid.org/0000-0002-0651-4059

Catalogue record

Date deposited: 11 Mar 2010
Last modified: 02 Oct 2018 00:37

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