Mini 3.5mm Toslink/optical cables will NOT convert digital audio signals (optical/Toslink) into analog signals or the other way round. This is not an analog to digital converter cable. OPTICAL cables will NOT plug into standard 3.5mm headphone jack and convert analog audio signals into digital audio with optical light. It is specifically used to transmit digital (optical) audio only.
The optical 3.5mm connector mini TOSLINK cables are made for specific devices such as iMacs, TVs and Notebooks that have a built in 3.5mm OPTICAL port. iPhones/smartphones do NOT have optical 3.5mm ports
 Low-loss, low-jitter, maximum signal transfer, precision polished fiber core eliminates RF, EM, and ground loop interference. Metal connectors dampen vibration