Details

Autor(en) / Beteiligte

• Li, Xiaoping
• Zhang, Haotian
• Ma, Rende

Titel

Phase Compensation Sensitized Wave Front Splitting Fiber Mach-Zehnder Interferometer

Ist Teil von

• IEEE photonics technology letters, 2022-12, Vol.34 (24), p.1357-1360

Ort / Verlag

New York: IEEE

Erscheinungsjahr

2022

Link zum Volltext

• IEEE_Xplore

Quelle

IEEE Electronic Library (IEL)

Beschreibungen/Notizen

• Based on the phase compensation, we theoretically and experimentally research into the sensitization of wave front splitting fiber Mach-Zehnder interferometer (MZI). When the optical path difference between the two arms of MZI is compensated to a small value, chromatic dispersion will play a key role in improving the refractive index sensitivity (<inline-formula> <tex-math notation="LaTeX">S_{\mathbf {RI}} </tex-math></inline-formula>). In theory, <inline-formula> <tex-math notation="LaTeX">S_{\mathbf {RI}} </tex-math></inline-formula> could reach infinity at a critical point. As an example, a phase compensated MZI working near the critical point of infinite <inline-formula> <tex-math notation="LaTeX">S_{\mathbf {RI}} </tex-math></inline-formula> is realized, achieving a sensitivity of-<inline-formula> <tex-math notation="LaTeX">1.467\times 10^{5} </tex-math></inline-formula> nm/RIU when the salinity is 1 PPT (Parts Per Thousand). Compared with the uncompensated wave front splitting MZI, the <inline-formula> <tex-math notation="LaTeX">S_{\mathbf {RI}} </tex-math></inline-formula> is improved around an order of magnitude. Much larger <inline-formula> <tex-math notation="LaTeX">S_{\mathbf {RI}} </tex-math></inline-formula> can be obtained by matching the refractive index and thickness of wave front splitter with that of phase compensator. It is worth noting that chromatic dispersion can also induce <inline-formula> <tex-math notation="LaTeX">S_{\mathbf {RI}} </tex-math></inline-formula> to vary nonlinearly with the sample refractive index.