Digital Optical Connection – What It Is And How To Use It

What you need to know about Digital Optical connections

Digital optical is a type of audio connection used in home theater systems and stereo systems for automobiles. Fewer devices are being made with digital optical output ports, so it's important to understand which types of connections your audio equipment can support.

What Is a Digital Optical Connection?

Digital optical is a physical connection that uses fiber optics to transfer audio data from a compatible source device to a compatible playback device using a specially designed cable and connector. The audio data is converted from digitally encoded electrical pulses to light on the transmission end using an LED light bulb.

After the light passes through the digital optical cable to its destination, the light pulses are converted back to electrical pulses containing the audio information. The electrical sound pulses then travel further through the compatible destination device (such as a home theater or stereo receiver) that processes them, eventually converting them to analog signals and amplifying them so that they can be heard through speakers or headphones.

Digital optical connections are also referred to as TOSLINK connections. TOSLINK is short for "Toshiba Link" since Toshiba was the first company to standardize the technology. The development and implementation of the digital optical (Toslink) connection paralleled the introduction of the CD audio format, where it was first used in high-end CD players before is expanded into home theaters.

Cables2Go Digital Optical Toslink Cable Example
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Devices That May Have Digital Optical Connections

Digital optical connections are typically included on the following devices:

  • DVD players
  • Blu-ray Disc players
  • Ultra HD Blu-ray Players
  • Media streamers
  • Cable/satellite boxes
  • DVRs
  • Game consoles
  • CD players
  • Home theater receivers
  • Soundbars
  • Vehicle stereo receivers
  • TVs

Some Blu-ray players have eliminated digital optical as an audio connection, instead opting for an HDMI-only output for both audio and video. If you have a home theater receiver that has digital optical connections but no HDMI connections, make sure the devices you want to use include a digital optical output connection.

Digital optical connections only transmit audio. For video, you need to use a separate type of connection, such as HDMI, component, or composite.

Digital Optical Connections and Audio Formats

The types of digital audio signals that can be transferred by a digital optical connection include two-channel stereo PCM, Dolby Digital/Dolby Digital EX, DTS Digital Surround, and DTS ES surround sound formats.

When the digital optical connection was developed, it was made to accommodate the digital audio standards at the time (mainly 2-channel CD playback). Thus, digital audio signals such as 5.1/7.1 multi-channel PCM, Dolby Digital Plus, Dolby TrueHD, Dolby Atmos, DTS-HD Master Audio, DTS:X, and Auro 3D Audio cannot be transferred via digital optical connections. These types of audio signal formats require the use of HDMI connections.

Digital Optical vs Digital Coaxial Connections

Digital coaxial is another digital audio connection option that has the same specifications and limitations as digital optical. However, instead of using light to transfer audio signals, data gets transferred via traditional wire using RCA-style connectors. The major difference between coaxial and optical cables is that the former offers higher bandwidth. Coaxial connections are also more sturdy, but they are prone to electromagnetic interferences.

OPPO Digital BDP-103D – Digital Coaxial, Digital Optical