Rare-earth iron-compound (Terfenol)-based optical phase modulator/magnetometer for use in fiber optic smart-structure sensors

1993 ◽  
Author(s):  
Venkatapura S. Sudarshanam ◽  
K. D. Kamdar ◽  
Richard O. Claus
Keyword(s):  
Rare Earth ◽  
Fiber Optic ◽  
Smart Structure ◽  
Iron Compound ◽  
Phase Modulator ◽  
Optical Phase

Digital Closed Loop Fiber-Optic Current Sensor Based on Integrated Optical Phase Modulator

2013 ◽  
Vol 300-301 ◽  
pp. 427-431 ◽  
Author(s):  
Xia Xiao Wang ◽  
Xi Chen Wang ◽  
Xiu Juan Feng
Keyword(s):  
Insertion Loss ◽  
Closed Loop ◽  
Beam Splitter ◽  
Fiber Optic ◽  
Optical Path ◽  
Polarization Beam Splitter ◽  
Current Sensor ◽  
Phase Modulator ◽  
Optical Phase ◽  
Integrated Optical

The paper presents digital closed loop fiber-optic current sensor (FOCT)’s optical path which combines integrated optical modulator and polarization beam splitter as optimum combination, as well as numerical analysis on insertion loss of traditional optical path scheme which consists of straight waveguide and optical path proposed by ABB. It shows that loss causes equivalent noise current which will affect the sensitivity of photo detector. The calculation and experiment confirm that loss of optical path is an important factor for FOCT’s sensitivity, and optical path composed of integrated optical phase modulator with Y-Branch profile and polarization beam splitter can effectively reduce the insertion loss and improve sensitivity of the system.

scholarly journals Optical Microfiber All−Optical Phase Modulator for Fiber Optic Hydrophone

Nanomaterials ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 2215
Author(s):  
Minwei Li ◽  
Yang Yu ◽  
Yang Lu ◽  
Xiaoyang Hu ◽  
Yaorong Wang ◽  
...  
Keyword(s):  
Acoustic Signal ◽  
Fiber Optic ◽  
Phase Modulator ◽  
Modulation Amplitude ◽  
Underwater Acoustic ◽  
Optical Phase ◽  
Sensing Applications ◽  
All Optical ◽  
Optical Microfiber ◽  
Underwater Acoustic Signal

In order to meet the needs of phase generated carrier (PGC) demodulation technology for interferometric fiber optic hydrophones, we proposed an optical microfiber all−optical phase modulator (OMAOPM) based on the photo−induced thermal phase shift effect, which can be used as a phase carrier generation component, so as to make the modulation efficiency and working bandwidth of this type of modulator satisfy the requirements of underwater acoustic signal demodulation applications. We analyzed the modulation principle of this modulator and optimized the structural parameters of the optical microfiber (OM) when the waist length and waist diameter of OM are 15 mm and 1.4 μm, respectively. The modulation amplitude of the modulator can reach 1 rad, which can meet the requirements of sensing applications. On this basis, the optical fiber hydrophone PGC−Atan demodulation system was constructed, and the simulated underwater acoustic signal test demodulation research was carried out. Experimental results showed that the system can demodulate underwater acoustic signals below 1 kHz.

scholarly journals Sensitivity improvement of broadband electro-optic polymer-based optical phase modulator using 1D and 2D photonic crystal structures

2017 ◽  
Vol 15 (1) ◽  
pp. 010003-10007 ◽  
Author(s):  
K. Receveur K. Receveur ◽  
K. Wei K. Wei ◽  
M. Hadjloum M. Hadjloum ◽  
M. El Gibari M. El Gibari ◽  
A. De Rossi A. De Rossi ◽  
...  
Keyword(s):  
Photonic Crystal ◽  
Crystal Structures ◽  
Phase Modulator ◽  
Optical Phase ◽  
Electro Optic ◽  
Sensitivity Improvement
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