Ion-exchanged planar lossless splitter at 1.5 µm

The authors demonstrate the first ion-exchanged, planar lossless splitter at 1.5 µm. The 1 × 2 device was fabricated by thallium ion exchange in an Er/Yb codoped borosilicate glass, and achieved lossless splitting over the wavelength range 1534–1548 nm when pumped with a 980 nm laser diode.