2 results about "Angle modulation" patented technology

An optical angle modulator includes a first generation unit that generates first angle-modulated light and second angle-modulated light by angle-modulating continuous light with an electrical signal, and a second generation unit that generates third angle-modulated light by partial degenerate four-wave mixing of the first angle-modulated light and the second angle-modulated light, the frequency band of the first angle-modulated light and the frequency band of the second angle-modulated light being different, the angle of the second angle-modulated light decreasing due to the electrical signal during a period in which the angle of the first angle-modulated light increases due to the electrical signal, and the angle of the second angle-modulated light increasing due to the electrical signal during a period in which the angle of the first angle-modulated light decreases due to the electrical signal.

The application provides a single firewire communication method based on current detection and thyristor modulation, comprising: calibrating zero-crossing timing reference and reference current; establishing mapping of data symbols and thyristor conduction angle and dynamically adjusting according to loop current size, encoding to-be-transmitted data to generate encoding sequence; converting the encoding sequence into a thyristor trigger signal to drive the conduction angle to conduct at the corresponding moment, generating stable current fluctuation through conduction angle modulation and transmitting to the receiving end; the receiving end collects loop current fluctuation signals in real time and processes them through multi-stage filtering to obtain effective current signals, initializes decoding threshold according to the reference current, identifies the conduction angle change corresponding to the effective current signals to restore the symbols, and outputs after checking the symbols. The thyristor specific conduction angle is used for data encoding, the small change of the detected loop current is used for data decoding, and the problems of unstable communication and high decoding error rate in the single firewire small current scene are solved.