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arXiv:1607.07154 · Optics Letters

All-optical buffer based on temporal cavity solitons operating at 10 Gb/s

Jae K. Jang, Miro J. Erkintalo, Jochen Schröder, Benjamin J. Eggleton, Stuart G. Murdoch, Stéphane Coen

Published Sep 26, 2016• 53 citations
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Abstract

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.

DOI
10.1364/ol.41.004526

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We present a loadable and erasable all-optical fiber storage buffer based on parametric gain and cross-phase modulation (XPM) loading. The gain is provided by a phase-sensitive amplifier (PSA), implemented as a Sagnac interferometer, and relies on the nonlinear interaction within standard dispersion-shifted fiber. PSAs inherently have the property of stabilizing ones and zeros and thus eliminate the need to use optical filters within the buffer, or the need for any other kind of intensity discriminator. The action of the PSA is then twofold. It provides the gain and also achieves bistability of the buffer, which gives it an advantage over a linear amplifier such as erbium-doped fiber amplifier for our experimental configuration. External data are written into the buffer using wavelength-induced XPM. This method is insensitive to the optical phase of the incoming data and thus does not require tracking of its phase. The buffer is erased by employing a nonlinear optical loop mirror as a switch. We demonstrate storage of picosecond pulse packets at bit rates of 1 Gb/s for periods of time up to 1 ms.
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.