Sang-Mok Lee
Seoul National University · 地球惑星科学
研究室紹介
Professor Sang-Mok Lee's research lab specializes in advanced materials and optical communication systems, with a strong focus on polymer blends for sustainable materials and high-capacity optical access networks. The lab investigates the thermal, rheological, and mechanical behaviors of biodegradable polymer composites such as PLA/PBSA blends, aiming to develop eco-friendly materials with tailored properties. Concurrently, the lab pioneers innovative passive optical network (PON) technologies, particularly wavelength-division-multiplexing (WDM and DWDM) systems using wavelength-locked Fabry-Pérot laser diodes to enable long-reach, high-capacity, and energy-efficient fiber-optic communication. The integration of statistical manifold-based image analysis further extends their work into intelligent signal processing and pattern recognition.
Research Overview
Research Output Trend
Figures are computed from collected data and may differ slightly.
Selected Papers
15We investigated thermal, rheological, morphological and mechanical properties of a binary blend of poly(lactic acid) (PLA) and poly(butylene succinate adipate) (PBSA). The blends were extruded and their molded properties were examined. DSC thermograms of blends indicated that the thermal properties of PLA did not change noticeably with the amount of PBSA, but thermogravimetric analysis showed that thermal stability of the blends was lower than that of pure PLA and PBSA. Immiscibility was checked
We demonstrate a bidirectional 12-channel wavelength-division-multiplexing passive optical network (WDM-PON) with 50-GHz channel spacing based on wavelength-locked Fabry-Pe/spl acute/rot laser diodes. The maximum transmission length is 30 km including 20 km of feeder fiber and 10 km of distribution fiber. The proposed WDM-PON system can accommodate 80 channels with erbium-doped fiber amplifier-based broad-band light sources. We also propose a few methods for the wavelength-independent operation
We demonstrate a bidirectional long-reach 64-channel dense wavelength division multiplexing passive optical network (DWDM-PON) based on wavelength-locked Fabry-Peacuterot laser diodes (F-P LDs) with 50-GHz channel spacing. The mode control of the F-P LDs enhances the output power and decreases the required injection power. Packet-loss-free transmission in both 64 upstream and 64 downstream channels is obtained, guaranteeing more than 100 Mb/s per channel through 70 km of single mode fiber withou
A bidirectional 80-km-reach 64-channel dense wavelength-division-multiplexing passive optical network with 50-GHz channel spacing based on wavelength-locked Fabry-Peacuterot laser diodes is demonstrated. By changing the position of the broadband light source (BLS) for the upstream channels to the remote node, both the need for a high-power BLS and the power penalties induced by backscattering are overcome. Packet-loss-free transmission is obtained, guaranteeing 125 Mb/s per channel (8-Gb/s capac