Complete optical on-chip isolation based on asymmetric stimulated Raman gain/loss

Abstract

In this Letter, we suggest an on-chip integrated isolator based on an add-drop filter with unidirectional Raman-induced gain (or loss). For the steady state, complete one-way propagation for monochromatic signals is realized in the bus waveguide. For transient transmission, the burr is suppressed. And the power consumption is reduced by enhancing the Q factor of the resonator at the control frequency.

Nonreciprocal light propagation in coupled microcavities system beyond weak-excitation approximation

“…However, unfortunately the requirement of the magneto-optical effect is the big size components and strong external magnetic fields, which are harmful for the on-chip optical nonreciprocal devices. Beyond that, one can also break the time-reversal symmetry and design the nonreciprocal optical devices by time-dependent effects [5,6], unbalanced quantum coupling [7][8][9][10] or optical nonlinearity [11][12][13][14][15][16][17][18]. The ubiquitous optical nonlinearity in different optical systems has been extensively studied and further adopted in design of nonreciprocal light propagation devices.…”

“…The ubiquitous optical nonlinearity in different optical systems has been extensively studied and further adopted in design of nonreciprocal light propagation devices. For example, many schemes have been reported through the nonlinearity of the waveguides, such as the second order nonlinearity χ (2) [11][12][13][14], dispersion-engineered chalcogenide [15], Raman amplification [16,17] and so on.…”