We have developed a 0.97 mm diameter ultra-thin optical fiberscope that can access the peripheral lung fields of human lungs and evaluated this fiberscope in resected human lungs for evaluation of the peripheral airways including the alveoli. Keywords: alveolus; bronchoscopy; desiccator; peripheral airways; ultra-thin fiberscope EN alveolus bronchoscopy desiccator peripheral airways ultra-thin fiberscope 881 884 4 08/21/23 20230901 NES 230901 DATA AVAILABILITY STATEMENT The data that support the findings of this study are available from the corresponding author upon reasonable request. This ultra-thin fiberscope, called the Laser eYe Ultra-thin fiberscope (LYU), can access the peripheral lung field. Observation of peripheral airways using ultra-thin fiberscope. [Extracted from the article]