**2. Downsizing the F-SAS sensor**

Under the assistance of the "Beautiful Fukushima Next-Generation Medical Industry Agglomeration Project," in Japan, we have succeeded in downsizing the F-SAS sensor as shown in **Figure 12** and have recognized that it highly correlates with polysomnography (PSG) and pulse oximetry (PLSX). The F-SAS sensor is promising for screening latent SAS patients (Sleep Apnea Syndrome patients) during usual sleep.

*Optical Fiber-Based Sleep Apnea Syndrome Sensor DOI: http://dx.doi.org/10.5772/intechopen.91060*

**Figure 12.**

*Portable prototype and original F-SAS sensor.*
