Theory and design of a simple tunable sagnac loop filter for multi-wavelength fibre lasers

M.A. Mirza; G. Stewart

doi:10.1364/AO.47.005242

Theory and design of a simple tunable sagnac loop filter for multi-wavelength fibre lasers

M.A. Mirza, G. Stewart

Electronic And Electrical Engineering

Research output: Contribution to journal › Article

39 Citations (Scopus)

Abstract

We present a novel design for a Sagnac loop filter (SLF) whose periodic output spectrum can be fully controlled by cascading a small-birefringence loop (SBL) with a high-birefringence loop (HBL).We develop a detailed theoretical analysis, using the Jones vector method, to calculate the transfer function of the tunable SLF. It has been quantitatively shown that both the transmission coefficient and the phase of the SLF can be controlled by adjusting the orientation angle of the birefringent axes of the SBL in the plane of polarization. The theory has been confirmed by experimental results where a stress-induced SBL was mechanically rotated to tune both the wavelength and the power of a periodic output spectrum. Such a tunable SLF is used in the design of a multiwavelength erbium-doped fiber laser in the C band.

Original language	English
Pages (from-to)	5242-5252
Number of pages	10
Journal	Applied Optics
Volume	47
Issue number	29
DOIs	https://doi.org/10.1364/AO.47.005242
Publication status	Published - Oct 2008

Fingerprint

Fiber lasers

Birefringence

fiber lasers

filters

Wavelength

birefringence

wavelengths

Erbium

Transfer functions

Polarization

output

C band

transfer functions

erbium

adjusting

polarization

coefficients

Keywords

sagnac loop filter
small-birefringence loop
high-birefringence loop
fiber laser

Cite this

Mirza, M. A., & Stewart, G. (2008). Theory and design of a simple tunable sagnac loop filter for multi-wavelength fibre lasers. Applied Optics, 47(29), 5242-5252. https://doi.org/10.1364/AO.47.005242

Mirza, M.A. ; Stewart, G. / Theory and design of a simple tunable sagnac loop filter for multi-wavelength fibre lasers. In: Applied Optics. 2008 ; Vol. 47, No. 29. pp. 5242-5252.

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abstract = "We present a novel design for a Sagnac loop filter (SLF) whose periodic output spectrum can be fully controlled by cascading a small-birefringence loop (SBL) with a high-birefringence loop (HBL).We develop a detailed theoretical analysis, using the Jones vector method, to calculate the transfer function of the tunable SLF. It has been quantitatively shown that both the transmission coefficient and the phase of the SLF can be controlled by adjusting the orientation angle of the birefringent axes of the SBL in the plane of polarization. The theory has been confirmed by experimental results where a stress-induced SBL was mechanically rotated to tune both the wavelength and the power of a periodic output spectrum. Such a tunable SLF is used in the design of a multiwavelength erbium-doped fiber laser in the C band.",

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Mirza, MA & Stewart, G 2008, 'Theory and design of a simple tunable sagnac loop filter for multi-wavelength fibre lasers', Applied Optics, vol. 47, no. 29, pp. 5242-5252. https://doi.org/10.1364/AO.47.005242

Theory and design of a simple tunable sagnac loop filter for multi-wavelength fibre lasers. / Mirza, M.A.; Stewart, G.

In: Applied Optics, Vol. 47, No. 29, 10.2008, p. 5242-5252.

Research output: Contribution to journal › Article

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AB - We present a novel design for a Sagnac loop filter (SLF) whose periodic output spectrum can be fully controlled by cascading a small-birefringence loop (SBL) with a high-birefringence loop (HBL).We develop a detailed theoretical analysis, using the Jones vector method, to calculate the transfer function of the tunable SLF. It has been quantitatively shown that both the transmission coefficient and the phase of the SLF can be controlled by adjusting the orientation angle of the birefringent axes of the SBL in the plane of polarization. The theory has been confirmed by experimental results where a stress-induced SBL was mechanically rotated to tune both the wavelength and the power of a periodic output spectrum. Such a tunable SLF is used in the design of a multiwavelength erbium-doped fiber laser in the C band.

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KW - high-birefringence loop

KW - fiber laser

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DO - 10.1364/AO.47.005242

M3 - Article

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