Despite more than 40 years of development, it remains difficult for optical logic computing to support more than four operands because the high parallelism of light has not been fully exploited in current methods that are restrained by inefficient optical nonlinearity and redundant input modulation. In this paper, we propose a large-scale optical programmable logic array (PLA) based on parallel spectrum modulation. By fully exploiting the wavelength resource, an eight-input PLA is experimentally demonstrated with 256 wavelength channels. And it is extended to nine-input PLA through the combination of wavelength’s and spatial dimensions. Based on PLA, many advanced logic functions like 8-256 decoder, 4-bit comparator, adder and multiplier, and state machines are first realized in optics. We implement the two-dimensional optical cellular automaton (CA) for what we believe is the first time and run Conway’s Game of Life to simulate the complex evolutionary processes (pulsar explosion, glider gun, and breeder). Other CA models, such as the replicator-like evolution and the nonisotropic evolution to generate the Sierpinski triangle are also demonstrated. Our work significantly alleviates the challenge of scalability in optical logic devices and provides a universal optical computing platform for two-dimensional CA.
We experimentally demonstrate a method for predicting and compensating the system error of a 3×3 on-chip microring resonator (MRR) weight bank using a pre-designed back propagation (BP) neural network. The system error can be quickly predicted and well compensated to improve the computation precision of optical matrix-vector multiplication (MVM), without bulky experimental devices. The results show that the computation precision can be increased from 5- bit to 7-bit. This work provides a weight accuracy improvement method for MRR-based photonic integrated chips for applications such as optical computing and optical communication.
Optical communication technology has made great strides for several decades and various multiplexing technologies have been developed to greatly increase the communication capacity, such as time division multiplexing technology, wavelength division multiplexing technology, polarization division multiplexing (PDM) technology and mode division multiplexing technology (MDM), etc. The high-speed development of these multiplexing technologies motivate the demands for measurement of these optical parameters, such as mode, polarization and frequency. In this paper, we will review some research advances on the measured methods of mode distribution and polarization state of light in our group, including measurement of orbital angular momentum modes, linearly polarized modes and polarization modes. These works represent new progresses in spatial mode analysis and polarization analysis, showing great potential for applications in communication systems with MDM and PDM.
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