L-band optical fiber amplifier
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United States of America Patent
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Issued Date -
Jan 10, 2002
app pub date -
Apr 6, 2001
filing date -
Oct 6, 1999
priority date (Note) -
Abandoned
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Abstract
Disclosed relates to an L-band optical fiber amplifier which amplifies an L-band optical signal of 1570 nm to 1610 nm. In general, when a pumping light of 980 nm for example, output from a pumping light generating laser diode, is supplied to an erbium doped fiber EDF, an amplified spontaneous emission ASE having a bandwidth of 1530 nm to 1560 nm, namely, C-band is generated. The L-band optical fiber amplifier of the invention is configured in a manner that ASE transmitted in the backward direction, or a predetermined wavelength light selected from the bandwidth of 1530 nm to 1560 nm is reflected by a reflecting means and re-injected to EDF. A fiber bragg grating FBG or a reflecting mirror is applied as the reflecting means. The reflected light from the reflecting means is re-injected to EDF and acts as the pumping light, thus increasing the amplification gain for the L-band input light remarkably.
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