Boots – shoes – and leggings
Patent
1993-10-20
1996-08-20
Ramirez, Ellis B.
Boots, shoes, and leggings
359127, 359164, 359180, 359189, G01S 1702
Patent
active
055485316
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to an optical processing system and to a method of processing optical data.
BACKGROUND OF THE INVENTION
The use of optical transmission media, such as optical fibres and integrated optics, as a high bandwidth channel, is insufficient by itself to implement high-capacity optical processing networks. The ultimate capacity of the channel will be limited by the processing speed of the associated electronics circuitry. Current stage-of-the-art electronic processing speeds are limited in the region of 1 GHz. However, optical processing methods potentially offer much higher processing throughput so that speeds may be pushed up to about 100 GHz.
Several fibre-optic networks utilising high bandwidth optical processing have been proposed recently. One such arrangement is based on an optical signal processor disclosed in international patent application Publication No. WO90/04823 in the name of the University of Strathclyde. In this arrangement, the optical signal processor and the method of processing provided a binary digit transformation so that after processing the digits, non-binary bits may be created. This required special non-standard circuitry to be manufactured to process the non-binary data. The special fabrication requirements for this circuit may limit the potential widespread use of the optical signal processor disclosed in the above publication.
SUMMARY OF THE INVENTION
An object of the present invention is to obviate or mitigate at least one of the aforementioned problems.
This is achieved by providing an optical processing and correlation system and assigning each user a unique code as its identity. When a user wishes to establish a communication link with another user, it encodes the unique identity of the latter (representing the destination address) and broadcasts to all other users. On reception, each receiver correlates its own unique address with the received signal. If the received signal has arrived at the correct destination, then the correlator output is a maximum; this is known as auto-correlation. Alternatively, if the received signal arrives at an incorrect destination, the correlator output is a minimum, known as cross-correlation. Thus, by monitoring the correlator output, desired and undesired signals can be identified by an all-optical network.
In one aspect of the optical processing arrangement of the present invention, each raw data or information data bit, is coded into one period of a code sequence according to the following rules:
The generated code sequences (x or x) have a further coding stage. Each "1" in the sequence x (or x) is translated to two bits separated by time T; for example (01) or (10). Each zero is translated into a complementary pair, that is (10) or (01), respectively, in a preferred arrangement each "1" is translated into (01) and each "0" is translated into (10). An "0" signifies no light pulse whilst a "1" signifies the presence of a light pulse. The digits of 01 or (10) are separated by the time T.
A fundamental difference exists between optical processing and conventional electronic processing as regards correlater architecture. The correlator weights/taps take the values +1 and -1 in the electronic processor and +1 and 0 in the optical processor. A previously reported biopolar tap is an exception of the latter category; Fibre Optic Bipolar Tap Implementation using an Incoherent Optical Source, Shabeer et al, Optical Letters, vol. 12, page 726, 1987. Coherent processing has been reported as being possible in principle, Prucnal, P. et al, Spread Spectrum Fibre Optic Local Area Network using Optical Processing, Journal of Light Wave Technology, vol. LT-4 No 5 May 1986, and should allow +1/-1 taps to be realised but is not yet practical at present.
According to one aspect of the present invention there is provided an optical processing system for identifying when an incoming optical signal has reached its correct destination, said optical processing system comprising, means coupled to said data transmission means and to an
REFERENCES:
patent: 4563774 (1986-01-01), Gloge
patent: 4731878 (1988-03-01), Vaidya
patent: 4742572 (1988-05-01), Yokoyama
patent: 4783851 (1988-11-01), Inou et al.
PCT Search Report, European Patent Office, Mar. 11, 1992.
British Telecommunications public limited company
Peeso Thomas
Ramirez Ellis B.
LandOfFree
Optical processing system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Optical processing system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical processing system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2335548