Partitioned optical delay line architecture for time steering of large 1-D array antennas

• US 5,103,495 A
• Filed: 04/11/1991
• Issued: 04/07/1992
• Est. Priority Date: 04/11/1991
• Status: Expired due to Fees

• Current Assignee: Government of The United State of America As Represented By The Secretary of The Army
• Original Assignee: United States Of America As Represented By The Secretary Of The Air Force
• Inventors: Goutzoulis, Anastasios P.
• Primary Examiner(s): FONT, FRANK G
• Application Number:
  US07/685,350
• Time in Patent Office: 362 Days
• Field of Search: 342/375, 342/374, 250/227.12, 350/96.10, 350/96.15, 350/96.16, 350/96.24, 455/610, 455/612, 455/613, 455/608, 370/1-4
• US Class Current: 385/15
• CPC Class Codes: G02B 6/2861 using fibre optic delay lines and optical elements associated with them, e.g. for use in signal processing, e.g. filtering delay lines in general H03H, H01P9/00; optical computing devices G06E
• CPC Class Codes: H01Q 3/2676 Optically controlled phased array

Abstract

A partitioned optical delay line apparatus for time-steering large array antenna converting microwave signals to optical signals which are optically delayed in binary programmable fiberoptic delay lines to provide a number of output signal delay sets.

Claims

1. A partitioned optical delay line apparatus for time steering of large array antennas comprising in combination:

means for converting a microwave signal to an optical signal, said converting means receiving and converting said microwave signal to an optical signal,

means for delaying optical signals, said optical delay means receiving and delaying said optical signal to provide a plurality of delay signals, each on a different optical wavelength.

a power divider means receiving and dividing said plurality of delayed signals into a plurality of input signals, and,

a plurality of bias delay lines respectively receiving a group of input signals of said plurality of input signals, the number of said plurality of bias delay lines corresponding to the number of elements in said array antenna, each bias delay line of said plurality of bias delay lines has a delay resolution which corresponds to its respective element, each bias delay line delaying its respective group of input signals to respectively provide an output signal delay set.

2. A partitioned optical delay line apparatus as described in claim 1 further including a multi-channel optical multiplexer, said optical multiplexer receiving said plurality of delay signals and providing a multiplexed output signal to said power divider means.

3. A partitioned optical delay line apparatus as described in claim 1 wherein said power divider means comprises an optical power divider.

4. A partitioned optical delay line apparatus as described in claim 1 wherein said converting means comprises a laser diode to convert said microwave signal to an optical signal.

5. A partitioned optical delay line apparatus as described in claim 1 wherein said optical delay means comprises a binary programmable fiberoptic delay line.

6. A partitioned optical delay line apparatus as described in claim 1 wherein each bias delay line of said plurality of bias delay lines comprises a binary programmable fiberoptic delay line.

7. A partitioned optical delay line apparatus as described in claim 5 wherein said binary programmable fiberoptic delay line utilizes a plurality of fiber segments to provide signal delay, each fiber segment of said plurality of fiber segment has a length that is equal to twice the length of its right neighbor.

8. A partitioned optical delay line apparatus as described in claim 6 wherein said binary programmable fiberoptic delay line utilizes a plurality of fiber segments to provide signal delay, each fiber segment of said plurality of fiber segment has a length that is equal to twice the length of its right neighbor.