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Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)

Intensity trapping of temporal cavity solitons

Yufeng Wang, Bruno Garbin, Gian‐Luca Oppo, Stéphane Coen, Miro J. Erkintalo, Stuart G. Murdoch

Published Jun 1, 2017• 0 citations
Publisher

Abstract

Temporal cavity solitons (TCSs) are optical pulses that persist inside coherently driven passive Kerr resonators [1]. Since their discovery, TCSs have been suggested as bits for all-optical buffers due to their flexibility [2]: they can be individually addressed, erased and moved around at will. To that end, a reliable method is required to move, position, and trap TCSs to precise locations. So far a successful method to achieve this has been to use a phase modulation of the driving field in space [3] or time [4]. Here, we demonstrate that TCS trapping and manipulation can also be achieved by inducing intensity gradients on the background field.

DOI
10.1109/cleoe-eqec.2017.8086504

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Temporal cavity solitons (TCSs) are optical pulses that persist inside coherently driven passive Kerr resonators [1]. Since their discovery, TCSs have been suggested as bits for all-optical buffers due to their flexibility [2]: they can be individually addressed, erased and moved around at will. To that end, a reliable method is required to move, position, and trap TCSs to precise locations. So far a successful method to achieve this has been to use a phase modulation of the driving field in space [3] or time [4]. Here, we demonstrate that TCS trapping and manipulation can also be achieved by inducing intensity gradients on the background field.
We report on a systematic study of temporal Kerr cavity soliton dynamics in the presence of pulsed or amplitude-modulated driving fields. In stark contrast to the more extensively studied case of phase modulations, we find that Kerr cavity solitons are not always attracted to maxima or minima of driving field amplitude inhomogeneities. Instead, we find that the solitons are attracted to temporal positions associated with specific driving field values that depend only on the cavity detuning. We describe our findings in light of a spontaneous symmetry breaking instability that physically ensues from a competition between coherent driving and nonlinear propagation effects. In addition to identifying a previously unfamiliar type of Kerr cavity soliton behavior, our results provide valuable insights into practical cavity configurations employing pulsed or amplitude-modulated driving fields.
Temporal solitons in coherently driven optical cavities have drawn considerable interest for their remarkable stability and promising applications such as in optical communications and spectroscopy [1]. These solitons arise in high-finesse cavities through a delicate balance between dispersion and Kerr nonlinearity, as well as gain and loss. In passive cavities, the coherent driving field provides the gain. Thus, in practice, only a small fraction of the soliton power can be extracted. Active cavity solitons (ACSs) [2], [3] overcome this limitation by integrating an intracavity amplifier to partially compensate for losses while keeping the cavity below lasing threshold. In this work, we leverage the active cavity scheme to theoretically and experimentally demonstrate the formation of stable ACSs with output coupling up to 90% under low power continuous-wave (CW) driving.
We demonstrate the operation of an all-optical buffer based on temporal cavity solitons stored in a nonlinear passive fiber ring resonator. Unwanted acoustic interactions between neighboring solitons are suppressed by modulating the phase of the external laser driving the cavity. A new locking scheme is presented that allows the buffer to operate with an arbitrarily large number of cavity solitons in the loop. Experimentally, we are able to demonstrate the storage of 4536 bits of data, written all optically into the fiber ring at 10 Gb/s for 1 min.