Planar lightwave circuitPLC device, wavelength tunable light source comprising the same device and wavelength division multiplexing-passive optical networkWDM-PON using the same light source

摘要

PURPOSE: A planar lightwave circuit, a wavelength tunable light source and a WDM-PON(Wavelength Division Multiplexing-Passive Optical Network) using the light source are provided to secure mechanical stability of a thin film metal heater by stacking a heat block layer between a lower clad layer and a silicon substrate. CONSTITUTION: A wavelength tunable light source of a PLC external cavity laser includes a first housing, a second housing, and a third housing. A semiconductor light gain medium(400) is mounted in the first housing. A PLC element is mounted on the second housing. The optical fiber(600) is mounted in the third housing. The first to third housings are arranged in an optical axis through a light coupling lens. The first to third housings are coupled through a laser welding method.