This invention pertains to a device and method for making same. The device
includes a substrate suitable for supporting pathways for optical signals;
separate pathways disposed on the substrate suitable for propagating
optical signals, the pathways including an input and an output optical
pathway; and a reflective surface in operative contact with the input and
output pathways for receiving an optical signal from the input pathway and
reflecting the optical signal into the output pathway. The method for
making the device includes the steps of providing two separate optical
pathways on a single substrate, one being an input pathway and the other
being an output pathway; providing a reflective surface in operative
contact with the pathways whereby an input optical signal is passed
through the input pathway, reflected by the reflective surface into the
output pathway, and passed out of the output pathway, whereby the device
can be made on a lithium niobate substrate with titanium-diffused pathways
with a loss of about 1.0 dB or less, in a space that is at least 1/5 the
space required by the same or similar prior art device.
