Single-mode PLC (Planar Lightwave Circuits) splitters are developed using silica glass waveguide circuits and aligned fiber pigtails, integrated inside a miniature package.

A fiber coupler is an optical fiber device with one or more input fibers and one or several output fibers. Light from an input fiber can appear at one or more outputs, with the power distribution potentially depending on the wavelength and polarization.

The 1310/1550nm High Isolation WDM is made by combining 1310/1550nm WDM couplers and/or optical filter technique to achieve dual-wavelength multiplexing and de-multiplexing.