Sub signal modulation apparatus, sub signal demodulation...

Details Sub signal modulation apparatus, sub signal demodulation... Sub signal modulation apparatus, sub signal demodulation...

2005-08-26

2008-11-25

Vanderpuye, Kenneth N (Department: 2613)

Optical communications

Transmitter

Including compensation

C398S030000, C398S032000, C398S033000, C398S094000, C398S181000

Reexamination Certificate

active

07457549

ABSTRACT:
A sub signal modulation apparatus, with the intention of stabilized transmission of a sub signal superimposed on main signal light irrespective of the intensity of the main signal light when used in a general-purpose main signal transmitter, including a sub signal outputting unit; a variable optical attenuator for variably attenuating main signal light, into which the main signal has been modulated, at a response speed lower than ½ of a speed of the main signal; an attenuation determining unit for determining, in accordance with the sub signal output from the sub signal outputting unit, an attenuation of the variable optical attenuator for the main signal light; and a stabilizing controller for controlling the attenuation determining unit such that an amplitude of the attenuation of the variable optical attenuator is stabilized to have a constant ratio to a mean intensity of the main signal light.

REFERENCES:
patent: 5663820 (1997-09-01), Shiragaki
patent: 6323978 (2001-11-01), Harley et al.
patent: 6574016 (2003-06-01), Harley et al.
patent: 7158290 (2007-01-01), Oota et al.
patent: 7158723 (2007-01-01), Wan et al.
patent: 2004/0223759 (2004-11-01), Fee
patent: 2005/0084202 (2005-04-01), Smith et al.
patent: 5-267766 (1993-10-01), None
patent: 8-186559 (1996-07-01), None
patent: 2000-134154 (2000-05-01), None
patent: 2000-165357 (2000-06-01), None
patent: 2002-111596 (2002-04-01), None
patent: 2003-510960 (2003-03-01), None
patent: WO 01/24431 (2001-04-01), None
patent: WO 2004040719 (2004-05-01), None

Affiliated with

Also associated with

Rating

Sub signal modulation apparatus, sub signal demodulation... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Sub signal modulation apparatus, sub signal demodulation..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Sub signal modulation apparatus, sub signal demodulation... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4030466