| US 7,505,689 B2 | ||
| Electronic signal blanking in optical transceivers | ||
| Robert C. Guyer, Beverly, Mass. (US); Tate J. Keegan, Goffstown, N.H. (US); Kevin A. LaRochelle, Goffstown, N.H. (US); Timothy J. O'Donnell, Bedford, N.H. (US); Joseph M. Schlupf, Newburyport, Mass. (US); and Heather L. Keegan, Goffstown, N.H. (US) | ||
| Assigned to BAE Systems Information and Electronic Systems Integration Inc., Nashua, N.H. (US) | ||
| Filed on Jan. 27, 2005, as Appl. No. 11/44,821. | ||
| Claims priority of provisional application 60/540317, filed on Jan. 29, 2004. | ||
| Prior Publication US 2005/0175349 A1, Aug. 11, 2005 | ||
| Int. Cl. H04B 10/00 (2006.01) | ||
| U.S. Cl. 398—138 [398/41; 398/135; 398/136; 398/128] | 16 Claims |
| 1. In a co-boresighted optical transceiver having a pulsed transmitter and a receiver utilizing the same aperture as said
transmitter and having a detector coupled to an integrator having a normal integrating period for accumulating the detected
energy, a system for permitting the simultaneous operation of said transmitter and receiver, comprising,
a synchronization pulse for activating said transmitter to create a pulse of energy such that a transmitter pulse is produced
a short time after the generation of said synchronization pulse; and
a voltage controlled switch between said detector and said integrator coupled to said synchronization pulse, and without a
system-level oversight processor, for interrupting the connection between said detector and said integrator upon generation
of said synchronization pulse and for reestablishing said connection so as to establish a receiver blanking interval shorter
than the normal integrating period for said receiver, whereby saturation of said receiver by said transmitter pulse is automatically
avoided with the generation of said transmitter pulse, and whereby the receiver function is automatically reestablished so
as not to materially affect receiver sensitivity;
wherein the time interval between the production of said transmitter pulse and the leading edge of said sync pulse is on the
order of one microsecond, thus to establish a one microsecond PreTrigger time interval.
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