title: Nonlinear dynamics in integrated coupled DFB lasers with ultra-short delay.
abstract: We report rich nonlinear dynamics in integrated coupled lasers with ultra-short coupling delay. Mutually stable locking, period-1 oscillation, frequency locking, quasi-periodicity and chaos are observed experimentally. The dynamic behaviors are reproduced numerically by solving coupled delay differential equations that take the variation of both frequency detuning and coupling phase into account. Moreover, it is pointed out that the round-trip frequency is not involved in the above nonlinear dynamical behaviors. Instead, the relationship between the frequency detuning Δν and the relaxation oscillation frequency νr under mutual injection are found to be critical for the various observed dynamics in mutually coupled lasers with very short delay.
authors.forename: Dong
authors.initials: D
authors.lastname: Liu
authors.forename: Changzheng
authors.initials: C
authors.lastname: Sun
authors.forename: Bing
authors.initials: B
authors.lastname: Xiong
authors.forename: Yi
authors.initials: Y
authors.lastname: Luo