Abstract
In this paper, we surveyed potential wavelength references in U-band
wavelength region. The hollow-core photonic bandgap fiber (PBGF) filled with
methane (CH<sub>4</sub>)
gas is used as a gas cell. The experimental results clearly indicate that
the weak absorption lines of methane can be used as U-band wavelength division
multiplexing (WDM) channel references due to the long interaction path length
provided by PBGF. The absorption lines of CH<sub>4</sub> are useful as wavelength references
in the 1625–1700 nm region. In addition, we have measured the pressure
broadening and the wavelength stability of absorption lines, and find that
absorption lines are particularly insensitive to external perturbation. This
technique is useful for wavelength calibration of components of communication
system, or as monitor the wavelength of the channels. It may be implemented
in next-generation WDM communication systems.
© 2011 IEEE
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