Optical: systems and elements – Optical modulator – Light wave temporal modulation
Reexamination Certificate
2008-07-29
2008-07-29
Ben, Loha (Department: 2873)
Optical: systems and elements
Optical modulator
Light wave temporal modulation
C359S308000, C398S085000, C398S095000, C385S007000
Reexamination Certificate
active
07405859
ABSTRACT:
A wavelength selecting apparatus includes a wavelength selecting filter and that a monitoring filter are similar acousto-optic tunable filters; a light source that outputs light having a specific wavelength to the monitoring filter; a light receiving unit that detects a wavelength of light that has passed the monitoring filter; and a control unit that outputs, to the wavelength selecting filter, a control signal having a control frequency to selectively pass light of a desirable wavelength. The light source includes a light emitting element that emits light of a wide wavelength band; and an optical filter having at least two transmission bands through which the light passes to the monitoring filter. The control unit, based on at least two wavelengths of the light output by the light source, outputs a control signal having a control frequency corresponding to the desirable wavelength.
REFERENCES:
patent: 6411411 (2002-06-01), Okazaki et al.
patent: 6509972 (2003-01-01), Korn
patent: 6845108 (2005-01-01), Liu et al.
patent: 7283750 (2007-10-01), Tian et al.
patent: 2002/0041721 (2002-04-01), Nakazawa
patent: 2004/0179840 (2004-09-01), Kai et al.
patent: 2004/0190904 (2004-09-01), Noguchi et al.
patent: 2004/0197099 (2004-10-01), Kai et al.
patent: 2005/0169633 (2005-08-01), Nakagawa et al.
patent: 3-233425 (1991-10-01), None
patent: 6-120605 (1994-04-01), None
patent: 10-262031 (1998-09-01), None
patent: 2002-40382 (2002-02-01), None
patent: 2003-344817 (2003-12-01), None
patent: 2004-260746 (2004-09-01), None
patent: 2004-260747 (2004-09-01), None
patent: 2004-282690 (2004-10-01), None
Terumi Cikama, “Photonic Network” Magazine Fujitsu vol. 50, No. 4 (Jul. 1999) pp. 215-223.
International Search Report of International Published Application No. PCT/JP2005/001139 (mailed May 17, 2005).
PCT/Published Application No. WO 2006/080074, Published Aug. 3, 2006 (International Application No. PCT/JP2005/001139).
International Preliminary Report on Patentability issued in corresponding International Patent Application No. PCT/JP2005/001139, mailed on Aug. 9, 2007.
Ben Loha
Fujitsu Limited
Staas & Halsey , LLP
LandOfFree
Method and apparatus for selecting wavelength does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for selecting wavelength, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for selecting wavelength will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2772350