Abstract

We propose a method to flatten Raman gain by using a polarization independent filter. It is formed by a fiber loop mirror contains a number of high birefringence fiber sections and polarization controller. The gain profile is observed for one and two sections of polarization maintaining fiber (PMF) with different lengths. By using single pump wavelength at 1455 nm and 5cm length of Hi-Bi FLM, we managed to flatten Raman gain to within ±0.5 dB over a bandwidth of 43 nm at the center wavelength of 1555 nm. By using two sections of Hi-Bi Fiber and longer PMF, which are 5 cm and 8.5 cm PMF in Hi-Bi FLM, we are able to flatten Raman gain to within ±0.5 dB over a bandwidth of 38 nm at the center wavelength of 1555 nm with lower gain suppression from its original gain profile.

© 2003 Optical Society of America

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References

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    [CrossRef]
  2. V.E.Perlin, H.G.Winful, �??Efficient design method for multi-pump flat-gain fiber Raman amplifiers,�?? OFC (Optical Society of America, Washington, D.C., 2002).
  3. Y. Emori, K. Tanaka, and S. Namiki, �??100nm bandwidth flat-gain Raman Amplifiers pumped and gainequalized by 12-wavelength channel WDM laser diode unit,�?? Electron. Lett. 35, 1355-1356 (1999).
    [CrossRef]
  4. F.Koch, S.A.E. Lewis, S.V. Chernikov, J.R. Taylor, V.Grubsky, D.S. Starodubov, �??Broad band gain flattened Raman Amplifier to extend operation in the third telecommunication window,�?? OFC 2000, (Optical Society of America, Washington, D.C., 2000) pp.103 �??105.
  5. S.Sergeyev, S.Popov, �??Polarization Dependent Gain in Fiber Raman Amplifiers: Effect of PMD and Pump States of Polarization�??, OFC (Optical Society of America, Washington, D.C., 2003) .pp. 22-23.
  6. R.H.Stolen, �??Polarization Effects in Fiber Raman and Brillouin Lasers,�?? IEEE J. Quantum Electron. QE-15, No.10, (1979).
  7. X.Fang and R.O Claus, �??Polarization-independent all-fiber wavelength division multiplexer based on Sagnac interferometer,�?? Opti. Lett. 20, 2146-2148 (1995).
    [CrossRef]
  8. X.Fang, H.Ji, C.T. Aleen, K.Demarest, and L.Pelz, �??A Compound high-order polarization-independent birefringence filter using Sagnac interferometers, �??IEEE Photon. Technol. Lett. 9, 458-460 (1997).
    [CrossRef]

Electron. Lett. 35

Y. Emori, K. Tanaka, and S. Namiki, �??100nm bandwidth flat-gain Raman Amplifiers pumped and gainequalized by 12-wavelength channel WDM laser diode unit,�?? Electron. Lett. 35, 1355-1356 (1999).
[CrossRef]

IEEE J. Quantum Electron.

R.H.Stolen, �??Polarization Effects in Fiber Raman and Brillouin Lasers,�?? IEEE J. Quantum Electron. QE-15, No.10, (1979).

IEEE Photon. Technol. Lett.

X.Fang, H.Ji, C.T. Aleen, K.Demarest, and L.Pelz, �??A Compound high-order polarization-independent birefringence filter using Sagnac interferometers, �??IEEE Photon. Technol. Lett. 9, 458-460 (1997).
[CrossRef]

V.E.Perlin, H.G.Winful, �??Optimizing the Noise Performance of Broad-Band WDM Systems with Distributed Raman Amplification,�?? IEEE Photon. Technol. Lett. 14, No.8, (2002).
[CrossRef]

OFC 2000

F.Koch, S.A.E. Lewis, S.V. Chernikov, J.R. Taylor, V.Grubsky, D.S. Starodubov, �??Broad band gain flattened Raman Amplifier to extend operation in the third telecommunication window,�?? OFC 2000, (Optical Society of America, Washington, D.C., 2000) pp.103 �??105.

OFC 2002

V.E.Perlin, H.G.Winful, �??Efficient design method for multi-pump flat-gain fiber Raman amplifiers,�?? OFC (Optical Society of America, Washington, D.C., 2002).

OFC 2003

S.Sergeyev, S.Popov, �??Polarization Dependent Gain in Fiber Raman Amplifiers: Effect of PMD and Pump States of Polarization�??, OFC (Optical Society of America, Washington, D.C., 2003) .pp. 22-23.

Opti. Lett.

X.Fang and R.O Claus, �??Polarization-independent all-fiber wavelength division multiplexer based on Sagnac interferometer,�?? Opti. Lett. 20, 2146-2148 (1995).
[CrossRef]

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Figures (6)

Fig. 1.
Fig. 1.

A Sagnac Interferometer with a loop birefringence element

Fig. 2.
Fig. 2.

Experimental setup of Raman gain flattening by using high birefringence fiber loop mirror.

Fig. 3.
Fig. 3.

Raman gain flattening and reflection spectrum by one section of Hi-Bi FLM with 5 cm PMF

Fig. 4.
Fig. 4.

Raman gain flattening and reflection spectrum by one section of Hi-Bi FLM with 8.5 cm PMF

Fig. 5.
Fig. 5.

Experimental setup of Raman gain flattening by using 2 sections high birefringence fiber loop mirror.

Fig. 6.
Fig. 6.

Raman gain flattening and reflection spectrum by two sections of Hi-Bi FLM with 5 cm and 8.5 cm PMF

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