Broadband all-optical modulation using a graphene-covered-microfiber

We demonstrate all-optical modulation based on ultrafast saturable absorption in graphene-covered-microfiber. By covering the microfiber surface with polydimethylsiloxane supported graphene film along the fiber length, a greatly enhanced interaction between the propagating light and the graphene can be obtained via the strong evanescent field of the microfiber. The strong light–graphene interaction results in high-speed, broadband all-optical modulation with maximum modulation depths of 5 dB and 13 dB for single-layer and bi-layer graphene, respectively. Such a graphene all-optical modulator is easy to fabricate, is compatible with optical fiber systems and has high potential in photonics applications such as all-optical switching and all-optical communications.

[1]  M. Lipson,et al.  All-optical control of light on a silicon chip , 2004, Nature.

[2]  Xiang Zhang,et al.  A graphene-based broadband optical modulator , 2011, Nature.

[3]  Q. Gong,et al.  Ultrasmall and ultrafast all-optical modulation based on a plasmonic lens , 2011 .

[4]  Sylvain Combrié,et al.  Ultrafast all-optical modulation in GaAs photonic crystal cavities , 2009 .

[5]  Xiaoying He,et al.  Passively Mode-Locked Fiber Laser Based on Reduced Graphene Oxide on Microfiber for Ultra-Wide-Band Doublet Pulse Generation , 2012, Journal of Lightwave Technology.

[6]  K. Loh,et al.  Graphene photonics, plasmonics, and broadband optoelectronic devices. , 2012, ACS nano.

[7]  Ping Jiang,et al.  Picosecond and low-power all-optical switching based on an organic photonic-bandgap microcavity , 2008 .

[8]  H. Lezec,et al.  All-optical modulation by plasmonic excitation of CdSe quantum dots , 2007 .

[9]  Xiang Zhang,et al.  Double-layer graphene optical modulator. , 2012, Nano letters.

[10]  Evelyn L. Hu,et al.  Ultrafast all-optical switching by single photons , 2011, Nature Photonics.

[11]  Michal Lipson,et al.  All-optical switching on a silicon chip. , 2004, Optics letters.

[12]  David J. Richardson,et al.  Optical fiber nanowires and microwires: fabrication and applications , 2009 .

[13]  X. He,et al.  Wavelength-tunable, passively mode-locked fiber laser based on graphene and chirped fiber Bragg grating. , 2012, Optics letters.

[14]  K. Novoselov,et al.  A roadmap for graphene , 2012, Nature.

[15]  David J. Thomson,et al.  Silicon optical modulators , 2010 .

[16]  M. Notomi,et al.  Sub-femtojoule all-optical switching using a photonic-crystal nanocavity , 2010 .