A novel gain-clamped Long wavelength band erbium doped fiber amplifier (L-band EDFA) based on ring erbium-doped
fiber laser cavity was demonstrated. By using a fiber Bragg grating (FBG) at the output end of the amplifier, a portion of
forward conventional band (C-band) amplified spontaneous emission (ASE) was reflected back into the system, this new
design provided a good gain clamping and decreased noise effectively. It used 1480nm laser diode (LD) to pump high
Er3+ −concentration erbium-doped fiber for higher efficiency and lower noise figure (NF). The gain was clamped at
17.5dB with a variation of 0.3 dB from input signal power of -30dBm to -12dBm for a pump power of 180mW. By
adjusting the intra-cavity loss, the gain reached 19.78dB with inputting small signal and NF below 5dB was obtained. At
the longer wavelength (1614nm) of L-band 9.2dB gain was obtained.
A single-mode Er/Yb-codoped short cavity fiber laser was experimented on the basis of previous short cavity fiber laser.
The single-mode operation is realized by using the FBG and a 10cm section of Er/Yb co-doped fiber as a short cavity.
The output power exceeds 1.5mW for pump power of 80mW. The linewidth of output laser was measured as 2MHz at
1532.64nm, and the side mode suppression ratio was 55dB. The single-mode was observed by an interferometer with
free spectrum range (FSR) of 7.5GHz, and the longitudinal-mode fabric is analyzed. Relative intensity noise was less
than -100dB/Hz.
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