Active optical transmission circuit structure suitable for usb protocol

Abstract

The invention provides an active optical transmission circuit structure suitable for a usb protocol. The active optical transmission circuit structure comprises an SSTX forwarding circuit and an SSRX driving circuit. The STX forwarding circuit is used for modulating an upstream electric signal to the VCSEL and transmitting the electric signal to the downstream SSRX driving circuit in the form of an optical signal; the SSRX driving circuit is used for converting a signal transmitted by the upstream light path into an electric signal and driving equipment or a USB Host; and the SSRX driving circuit judges the execution state of the LTSSM according to the communication condition, so that the switching between the plugging detection and the high-speed signal transmission of the driving equipment is realized.

Description

technical field [0001] The invention relates to the technical field of computing and communication, in particular to a circuit structure suitable for active optical transmission of the usb protocol. Background technique [0002] With the continuous development of processor technology, the main frequency of the processor continues to increase, and the communication speed of peripherals also increases accordingly. High-speed serial communication replaces the original parallel interface communication and becomes the mainstream of peripheral data communication. Under such a trend, the USB protocol has been widely used due to its high transmission speed, scalability, flexibility and other advantages. The development of USB has gone through USB1, USB2, USB3 to the latest USB4 protocol. The communication speed experienced 1.5Mbps, 12Mhz in the era of usb 1.0, 480MHz in ubs2.0, and reached 5Gbps in the era of USB3.0, the communication speed of usb3.1 gen2, usb3.2 gen2 reached 10Gb...

AI Technical Summary

Problems solved by technology

When this scheme implements lfps signal transmission, it is necessary to shield the noise suppression function in the optical fiber communication chip when there is no input signal, so that when the environmental noise is large, noise output may be generated in the idle state of usb communication, which affects device compatibility

And because the solution is fixedly terminated with a 50 ohm resistor, the device may not be recognized after the downstream device is unplugged and reinserted.

Images