Switchable Wavelength Generation by Injection-Locked Fiber
Laser Based on GS-RSOAs¹

H.-D. Ku^{a, b,} * and C.-S. Park^a

^a School of Information and Communications, Gwangju Institute of Science and Technology,
261 Cheomdan-gwagiro, Buk-Gu, Gwangju, Republic of Korea

^b Photonics Technology Institute, 5 Cheomdan 5gil, Gwangju, Republic of Korea

*e-mail: hdku@gist.ac.kr

Received November 25, 2011; in final form, December 10, 2011; published online April 3, 2012

Abstract—This paper proposes a switchable wavelength fiber laser (SWFL) based on an arrayed waveguide
grating (AWG) and a gain-saturated reflective semiconductor optical amplifier (RSOA). The SWFL was exper-
imentally implemented in the C- and L-bands. In order to achieve narrow-linewidth oscillation, the SWFL was
driven by bidirectional injection-locked RSOAs. The RSOA was operated in the gain-saturated region, using
gain compression properties to obtain uniform power over a wide bandwidth. Based on this configuration, we
obtained 40 C-band international telecommunication unit (ITU) wavelengths with 100-GHz channel spacing.
The SWFL displayed a narrow 3-dB bandwidth (<0.06 nm), a high and uniform peak power (P_max > 0.22 dB,
P_max < 0.26 dB), and a high and uniform side mode suppression ratio (SMSR > 66 dB, SMSR < 1 dB). The
peak-power and wavelength stabilities were 0.24 dB and 0.01 nm, respectively, at room temperature over a
1 h period.

DOI: 10.1134/S1054660X12050143

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