Fiber-integrated phase-change reconfigurable optical attenuator

• Main Authors: Martins, Tiago, Gholipour, Behrad, Piccinotti, Davide, MacDonald, Kevin F., Peacock, Anna C., Frazão, Orlando, Zheludev, Nikolay I.
• Other Authors: School of Physical and Mathematical Sciences
• Format: Article
• Language: English
• Published: 2020
• Subjects: Science::Physics; Fiber-integrated; Optical Attenuator
• Online Access: https://hdl.handle.net/10356/143921
• Institution: Nanyang Technological University

We report on the experimental demonstration of an optical-fiber-integrated, nonvolatile transmission switching device. The operating mechanism exploits a cavity resonance spectral shift associated with an induced change in the refractive index of a high-index thin film on the polished side facet of the fiber. In the present case, a thermally induced amorphous-crystalline structural transition in a 500 nm layer of germanium antimony telluride at a distance of 500 nm from the core-cladding interface of an SMF-28 single-mode fiber delivers resonant transmission contrast >0.5 dB/mm at 1315 nm. Contrast is a function of active layer proximity to the core, while operating wavelength is determined by layer thickness—varying thickness by a few tens of nanometers can provide for tuning over the entire near-infrared telecoms spectral range.