Experiments of all-optical switching due to cross-phase modulation in fiber grating coupler by lock-in amp. detection scheme
✍ Scribed by Fatemeh Abrishamian; Keiji Narumi; Shinya Sato; Masaaki Imai
- Publisher
- Elsevier Science
- Year
- 2008
- Tongue
- English
- Weight
- 649 KB
- Volume
- 281
- Category
- Article
- ISSN
- 0030-4018
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✦ Synopsis
We report results of experiments examining cross-phase modulation effect on fiber grating coupler (FGC). All-optical switching are observed in both cases of high pump pulses emitted from high-power Nd:YAG laser and mode-locked EDF laser. Based on coherent detection using a lock-in amplifier, the red-shift of the Bragg wavelength for a FGC was estimated to be 0.04-0.06 nm/1.5-1.7 kW peak power of EDF pump light at 1.55 lm. To avoid mixture of pump pulse and signal light at 1.55 lm, we have also performed the experiment using high power Nd:YAG laser as a pump power. For a Nd:YAG laser, the red-shift of Bragg wavelength is estimated to be 0.06 nm at maximum pump power of 2.1 kW. A simple model for the proposed detection scheme is given and the resultant red-shift is analyzed numerically.