Chang S Shim

Title: Chang S Shim: Innovator in Fiber Amplification and Signal Processing

Introduction

Chang S Shim is a notable inventor based in Daejeon, South Korea. He has made significant contributions to the fields of fiber amplification and signal processing, holding a total of 2 patents. His work has advanced the technology used in telecommunications and optical systems.

Latest Patents

One of his latest patents is an "Apparatus for adjusting channel width of multi-channel fiber amplifier." This invention includes an erbium-doped optical fiber amplifier designed to generate a spontaneously emitted, amplified noise beam without the application of an optical signal. The amplifier serves as a light source for wavelength division multiplexing, specifically as a fiber amplifier light source. The invention allows for easy control of the channel width using an angle-turned Fabry-Perot etalon filter and a fiber-optic beam expander, without affecting the free spectral range and output light power.

Another significant patent is the "Frame phase aligner." This device is designed for a transfer system and includes selection circuitry that selects one of several input signal groups, which consist of data, a clock signal, an inverse clock signal, and a frame synchronous signal. The selection signal generator provides a selection signal based on write data input, allowing the selection circuitry to choose the appropriate input signal group. The control signal generator then generates control clock signals and a retiming control signal to demultiplex the selected data, forming parallel data. The multiplexer synchronizes the demultiplexed data to a reference frame synchronous signal and control signals.

Career Highlights

Chang S Shim has worked with prominent organizations such as the Electronics and Telecommunications Research Institute and the Korea Telecommunication Authority. His experience in these institutions has allowed him to develop and refine his innovative ideas in telecommunications technology.

Collaborations

Throughout his career, Chang has collaborated with notable colleagues, including Jae Seung Lee and Sang Heung Lee. These partnerships have contributed to the advancement of his projects and innovations.

Conclusion

Chang S Shim is a distinguished inventor whose work in fiber amplification and signal processing has made a significant impact on telecommunications technology. His patents reflect his innovative spirit and dedication to advancing the field.