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

M.A. Mirza, G. Stewart

Research output: Contribution to journalArticle

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 languageEnglish
Pages (from-to)5242-5252
Number of pages10
JournalApplied Optics
Volume47
Issue number29
DOIs
Publication statusPublished - 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

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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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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 journalArticle

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