Abstract
We fabricate a microfiber knot-type ring resonator with a Sagnac loop reflector, and control the light velocity using the device. In this structure, light is reflected by the Sagnac loop and passes through the ring resonator twice. Thus, it possesses doubled transmission and group delay comparing with the microfiber ring resonator without the Sagnac loop. We experimentally demonstrate pulse advancement in an under-coupled microfiber knot-type ring resonator with a Sagnac loop reflector. In the experiment, a maximum of approximately 25 ps pulse advancement was achieved for a 5-Gb/s RZ signal.
Highlights
In recent years, controlling the velocity of light has been of great interest for its potential applications, such as tunable optical delay lines, optical buffers, true time delay for synthetic aperture radars, cryptography, and imaging in the quantum information field [1,2]
Light is reflected by the Sagnac loop and passes through the ring resonator twice
It possesses doubled transmission and group delay comparing with the microfiber ring resonator without the Sagnac loop
Summary
In recent years, controlling the velocity of light has been of great interest for its potential applications, such as tunable optical delay lines, optical buffers, true time delay for synthetic aperture radars, cryptography, and imaging in the quantum information field [1,2]. Fast light has been demonstrated based on optical fibers using stimulated Brillouin scattering (SBS) [4], metamaterial with negative refractive index [5], and coupled resonators with structural dispersion [6]. These demonstrations are based on optical materials with very large anomalous dispersion. Pulse distortion is likely to occur from signal attenuation or gain saturation in the fast light system based on sharp absorption or gain resonance as well as high order dispersion [9]. Group delay is enhanced as the light travels the microfiber ring resonator twice owing to the Sagnac loop reflector
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