Coherent light generators – Optical fiber laser
Reexamination Certificate
2005-11-15
2005-11-15
Harvey, Minsun Oh (Department: 2828)
Coherent light generators
Optical fiber laser
C372S092000, C372S099000, C372S102000
Reexamination Certificate
active
06965620
ABSTRACT:
A short laser cavity (up to 30 cm in length) comprising a free-space tunable MEMS Fabry-Perot filter, a collimating lens and a section of erbium-doped phosphate gain fiber (2-25 cm) is formed between a pair of broadband reflectors. The cavity is optically pumped to excite the erbium ions and provide gain, which establishes an initial longitudinal mode structure that spans the C-band with a mode spacing of at least 0.3 GHz and a roundtrip unsaturated gain of at least 8 dB over the tuning range. A controller tunes the MEMS filter, which has a filter function whose spectral width is at most ten and preferably less than four times the longitudinal mode spacing, to align its transmission maxima to one of a plurality of discrete output wavelengths that span the C-band. A thermal control element adjusts the longitudinal mode structure to align a single mode with the transmission maxima of the filter. Because the spectral width of the filter function is narrow, laser emission will be limited to a single longitudinal mode.
REFERENCES:
patent: 5425039 (1995-06-01), Hsu et al.
patent: 6137812 (2000-10-01), Hsu et al.
patent: 6426830 (2002-07-01), Robinson
patent: 6738186 (2004-05-01), Jiang et al.
patent: 2003/0072009 (2003-04-01), Domash et al.
patent: WO 02/075872 (2002-09-01), None
Kevin Hsu et al., Single-mode tunable erbium:ytterbium fiber Fabry-Perot microlaser, Optics Letters, Jun. 15, 1994, vol. 19, No. 12, pp. 886-888.
Ed Miskovic, Wavelength Lockers Keep Lasers in Line, Photonics Spectra, Feb. 1999, pp. 104-108.
Erlend Ronnekleiv, Frequency and Intensity Noise of Single Frequency Fiber Bragg Grating Lasers, Optical Fiber Technology, 2001, 7, pp. 206-235.
W.H. Loh et al., High Performance Single Frequency Fiber Grating-Based Erbium:Ytterbium -Codoped Fiber Lasers, Journal of Lightwave Technology, 1998, vol. 16, No. 1, pp. 114-118.
David L. Veasey et al., Arrays of distributed-Bragg-reflector waveguide lasers at 1536 nm in Yb/Er codoped phosphate glass, Applied Physics Letters, Feb. 8, 1999, vol. 74, No. 6, pp. 789-791.
Kevin Hsu et al., Continuous and discrete wavelength tuning in Er:Yb fiber Fabry-Perot laser, Optics Letters, Feb. 15, 1995, vol. 20, No. 4, pp. 377-379.
Todd Haber et al., Tunable Erbium-Doped Fiber Ring Laser Precisely Locked to the 50-GHz ITU Frequency Grid, IEEE Photonics Technology Letters, Nov. 2000, vol. 12, No. 11, pp. 1456-1458.
Chi Chih-Jen
Geng Jihong
Jiang Shibin
Kaneda Yushi
Li Ping
Gifford Eric A.
Harvey Minsun Oh
Nguyen Dung
NP Photonics Inc.
LandOfFree
Erbium-doped phosphate-glass tunable single-mode fiber laser... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Erbium-doped phosphate-glass tunable single-mode fiber laser..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Erbium-doped phosphate-glass tunable single-mode fiber laser... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3476883