This paper presents the development of a photovoltaic (PV) optical fiber based on a dye-sensitized solar cell (DSC) structure. The fiber consists of a DSC structure deposited on a claddingless optical fiber, with both silica and plastic optical fibers used as substrates. The DSC structure includes a ZnO:Al transparent current collector layer, a TiO₂ photoelectrode sensitized with ruthenium dye, a gelatinized iodine electrolyte, and a carbon-based counter electrode. The fiber converts light modes propagating in the modified cladding into an electrical signal. Current density-voltage (I-V) curves of PV fibers of different diameters are presented, with a maximum short circuit current (Isc) of 26 nA/cm² and a maximum open circuit voltage (Voc) of 0.44 V. The fabrication issues and applications of the PV fiber are discussed. The fiber is fabricated by depositing the DSC structure layer by layer on top of the optical fiber. Two types of fibers were used: polymethylmethacrylate (PMMA) and glass. The PMMA fibers were coated with 130 nm of ZnO:Al using atomic layer deposition (ALD) to make them electrically conductive. The TiO₂ photoelectrode was prepared by sintering a dry film of TiO₂ at 450–500 °C for 30 min. However, due to the low thermal stability of PMMA, the photoelectrode was prepared using the ALD method. The dye solution was applied to the fibers, followed by the gelatinized iodine electrolyte and the carbon-based counter electrode. The counter electrode was prepared by grinding graphite powder, carbon black, and TiO₂ nanoparticles together and mixing them with MePRN to form a thick suspension. The suspension was then gelatinized with PVDF-HFP. The performance of the optical fiber DSC was characterized with I-V curve measurements in a solar simulator. Two solar simulators were used: one custom-built with halogen lamps and another with a Xe-lamp and pigtail fiber. The results showed that the best performance was achieved with side-illuminated samples. The maximum open circuit voltage was 0.50 V with side lighting and 0.44 V with light coming from inside the fiber. The low short circuit current was attributed to the nonporous, compact structure of the TiO₂ photoelectrode film. The results indicate that the fiber-based DSC can be used as an optoelectronic sensor for monitoring the propagation of light in an optical fiber. The study also explored the use of ionic liquid-based gel to improve the long-term stability of the electrolyte.This paper presents the development of a photovoltaic (PV) optical fiber based on a dye-sensitized solar cell (DSC) structure. The fiber consists of a DSC structure deposited on a claddingless optical fiber, with both silica and plastic optical fibers used as substrates. The DSC structure includes a ZnO:Al transparent current collector layer, a TiO₂ photoelectrode sensitized with ruthenium dye, a gelatinized iodine electrolyte, and a carbon-based counter electrode. The fiber converts light modes propagating in the modified cladding into an electrical signal. Current density-voltage (I-V) curves of PV fibers of different diameters are presented, with a maximum short circuit current (Isc) of 26 nA/cm² and a maximum open circuit voltage (Voc) of 0.44 V. The fabrication issues and applications of the PV fiber are discussed. The fiber is fabricated by depositing the DSC structure layer by layer on top of the optical fiber. Two types of fibers were used: polymethylmethacrylate (PMMA) and glass. The PMMA fibers were coated with 130 nm of ZnO:Al using atomic layer deposition (ALD) to make them electrically conductive. The TiO₂ photoelectrode was prepared by sintering a dry film of TiO₂ at 450–500 °C for 30 min. However, due to the low thermal stability of PMMA, the photoelectrode was prepared using the ALD method. The dye solution was applied to the fibers, followed by the gelatinized iodine electrolyte and the carbon-based counter electrode. The counter electrode was prepared by grinding graphite powder, carbon black, and TiO₂ nanoparticles together and mixing them with MePRN to form a thick suspension. The suspension was then gelatinized with PVDF-HFP. The performance of the optical fiber DSC was characterized with I-V curve measurements in a solar simulator. Two solar simulators were used: one custom-built with halogen lamps and another with a Xe-lamp and pigtail fiber. The results showed that the best performance was achieved with side-illuminated samples. The maximum open circuit voltage was 0.50 V with side lighting and 0.44 V with light coming from inside the fiber. The low short circuit current was attributed to the nonporous, compact structure of the TiO₂ photoelectrode film. The results indicate that the fiber-based DSC can be used as an optoelectronic sensor for monitoring the propagation of light in an optical fiber. The study also explored the use of ionic liquid-based gel to improve the long-term stability of the electrolyte.