Co-prime optical transceiver array
A co-prime transceiver attains higher fill factor, improved side-lobe rejection, and higher lateral resolution per given number of pixels. The co-prime transceiver includes in part, a transmitter array having a multitude of transmitting elements and a receiver array having a multitude of receiving elements. The distance between each pair of adjacent transmitting elements is a first integer multiple of the whole or fraction of the wavelength of the optical. The distance between each pair of adjacent receiving elements is a second integer multiple of the whole or fraction of the wavelength of the optical signal. The first and second integers are co-prime numbers with respect to one another. The transceiver is fully realizable in a standard planar photonics platform in which the spacing between the elements provides sufficient room for optical routing to inner elements.
1. A co-prime optical transceiver comprising:
a transmitter array comprising a plurality of transmitting elements wherein a distance between each pair of adjacent transmitting elements is defined by a first integer multiple of a length characterized by a wavelength of an optical signal; and
a receiver array comprising a plurality of receiving elements wherein a distance between each pair of adjacent receiving elements is a second integer multiple of a length defined by the length, wherein said first and second integers are co-prime numbers with respect to one another;
a plurality of detectors adapted to detect a signal received by the receiver array to generate a plurality of detected signals; and
a plurality of phase modulators adapted to control phases of signals transmitted by the transmitted array in accordance with the plurality of the detected signals, wherein each of said transmitter and receiver arrays are two-dimensional arrays disposed symmetrically along a Cartesian coordinate system.
2. The transceiver array of claim 1 wherein said length is a fraction of the wavelength the optical signal.
3. A method of transmitting and receiving an optical signal, the method comprising:
transmitting the optical signal via a transmitter array comprising a plurality of transmitting elements wherein a distance between each pair of adjacent transmitting elements is defined by a first integer multiple of a length characterized by a wavelength of an optical signal;
receiving the optical signal via a receiver array comprising a plurality of receiving elements wherein a distance between each pair of adjacent receiving elements is a second integer multiple of a length defined by the length, wherein said first and second integers are co-prime numbers with respect to one another;
detecting a signal received by the receiver array to generate a plurality of detected signals; and
controlling phases of signals transmitted by the transmitted array in accordance with the detected signals, wherein each of said transmitter and receiver arrays are two-dimensional arrays disposed symmetrically along a Cartesian coordinate system.
4. The transceiver array of claim 3 wherein said length is a fraction of the wavelength of the optical signal.