학술논문
Variable Optical Attenuator Based on a PDMS-Embedded Microfiber Coupler
Document Type
Periodical
Source
IEEE Photonics Technology Letters IEEE Photon. Technol. Lett. Photonics Technology Letters, IEEE. 36(6):449-452 Mar, 2024
Subject
Language
ISSN
1041-1135
1941-0174
1941-0174
Abstract
We demonstrate a novel fiber-compatible variable optical attenuator (VOA) based on a tunable microfiber coupler, which is assembled by embedding two parallel 2.5- $\mu \text{m}$ -diameter microfibers in a 250- $\mu \text{m}$ -thickness polydimethylsiloxane (PDMS) film with a separation of $2.5~\mu \text{m}$ and a coupling length of 3 mm. Based on the strain-dependent refractive index of the PDMS, the attenuation of the VOA can be continuously tuned from 0.4 dB to 15.3 dB at 1550 nm wavelength with an insertion loss of 0.4 dB. The VOA presented here has advantages of excellent fiber compatibility, low insertion loss and compact structure.