We treat the nonlinear phase shift response in the weak perturbation limit as a linear digital filter that can be synthesized into the values of its poles and zeros and mapped onto an optical architecture. This procedure results in a significant enhancement in the nonlinear sensitivity with a response that is robust to frequency changes within the filter passband. A precompensation technique can be used to reduce distortions under strongly driven nonlinear operation to achieve a larger phase shift. We also show that nonlinear sensitivity improves with increasing filter group delay and can be increased within constant linear bandwidth by use of higher-order filters.
© 2003 Optical Society of America
Yan Chen, Geeta Pasrija, Behrouz Farhang-Boroujeny, and Steve Blair, "Engineering the nonlinear phase shift," Opt. Lett. 28, 1945-1947 (2003)