Ichun A. Chen Tian, C., Chen, I. C. A., Park, S. W., & Martini, R. (2013). Realization of pure frequency modulation of DFB laser via combined optical and electrical tuning. Optics Express, 21(7), 8401–8408. Chen, I. A., Park, S. W., Chen, G., Wang, C., Bethea, C., Martini, R., & Woolard, D. (2013). Ultra-broadband wavelength conversion sensor using thermochromic liquid crystals. Terahertz, rf, millimeter, and submillimeter-wave technology and applications vi, 8624.