Zhan Xu

Title: Zhan Xu: Optical Communications and Analog Circuit Innovations.

Introduction

Zhan Xu is an inventor based in Ottawa, Canada, whose patent work addresses analog signal processing and optical communications. He is associated with Ciena Corporation and is credited with 2 patents.

Latest Patents

Xu’s patent, “Current-Sourcing Temperature Compensated Logarithmic Transimpedance Amplifier Using NPN Matched Transistors with Output Adjustable Voltage,” describes a logarithmic transimpedance amplifier designed to convert an input current into an output voltage. Its disclosed configuration uses two operational amplifiers and a differential pair of NPN transistors in the amplifier’s feedback path. The transistor emitters connect to the respective inverting and non-inverting inputs of the operational amplifiers.

His patent, “Fast LOS Detection in a Coherent Optical Modem,” concerns rapid detection of a loss-of-signal condition in a coherent optical modem. The disclosed system uses input-power reporting circuitry in an Intradyne Coherent Receiver to monitor received optical signals. Processing circuitry responds to an interrupt by prioritizing LOS detection and, when a loss is detected, sends another interrupt to the host device.

Career Highlights

Xu’s listed inventions span two technical areas: temperature-compensated analog circuitry and optical modem signal monitoring. Both patents describe system designs intended to support signal conversion or timely detection in communications equipment.

Collaborations

Xu is associated with Ciena Corporation. Michael Vitic and Scott Kuntze are identified as his coworkers.

Conclusion

Zhan Xu’s two patents reflect contributions to amplifier design and fast loss-of-signal detection, technologies relevant to communications systems.