Low-noise narrow-linewidth fiber laser at 1550 nm (June 2003)

• Published in: Journal of lightwave technology 2004-01, Vol.22 (1), p.57-62
• Main Authors: Spiegelberg, C., Jihong Geng, Yongdan Hu, Kaneda, Y., Shibin Jiang, Peyghambarian, N.
• Format: Article
• Language: English
• Subjects: Applied sciences; Circuit properties; Electric, optical and optoelectronic circuits; Electronics; Exact sciences and technology; Fiber lasers; Frequency; Fundamental areas of phenomenology (including applications); Integrated optics. Optical fibers and wave guides; Laser feedback; Laser modes; Laser noise; Laser stability; Laser tuning; Lasers; Optical and optoelectronic circuits; Optical fiber polarization; Optics; Physics; Power generation; Power lasers
• ISSN: 0733-8724; 1558-2213
• DOI: 10.1109/JLT.2003.822208

We present a compact integrated fiber laser with more than 200 mW of output power. It combines polarized fiber output with very narrow linewidth of less than 2 kHz. The coherence length of the laser is measured to be longer than 5 km. The laser features high mode stability of less than /spl plusmn/10 MHz over hours. The relative intensity noise (RIN) spectrum is dominated by a peak at the relaxation oscillation frequency and is shot-noise limited otherwise. The RIN peak at 1 MHz is reduced to /spl sim/-130 dB/Hz by integrating a negative feedback circuit. In addition to thermal wavelength tuning, the laser frequency can be modulated at a bandwidth of up to 10 kHz via the piezoelectric effect.