Low power fibre coupler devices: few- versus many-period operation

摘要

Nonlinear dual core couplers acting as switches and amplifiers can theoretically operate at arbitrarily low input power provided the device is sufficiently long. Two radically different strategies exist: one with touching cores and a device length many periods long and the other with cores well separated and a device length one or two periods long. We find that the many-period scheme is several times longer than the few-period scheme for switches and orders of magnitude longer for large amplification.