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Optical Talk Sets
Optical Talk Sets

GAOTek Multi-Function Optical Talk Sets



GAOTek Multi-Function Optical Talk Set combines in one set the functions of both a digital optical phone and a stabilized light source. It provides high quality digital communication with a dynamic range of 40 dB and a transmission distance of up to 49.7 mi (80 km). This instrument offers full duplex numeral pronunciation correspondence function and high-quality conversation with low background noise, therefore, longer distances will not affect the signal too much. It is highly reliable and easy to use with an optical clip-on coupler. It is widely used in installation, optical testing and maintenance and fiber attenuation value testing in data, CATV and telecommunication networks.


  • Clear full duplex digital communication
  • Large LCD display with backlight
  • Optical clip-on coupler
  • Low battery power indication
  • Stabilized light source
  • Full duplex numeral pronunciation correspondence function
  • High quality conversation and low background noise
  • Online display and online call
  • Large LCD screen
  • Seven colors background light
  • Low power alarm
  • Stabilized Light Source

Technical Specifications

Transmission distance 49.7 mi (80 Km)
Dynamic range 40 dB
Wavelength 1310 nm/1550 nm
Emitter type FP-LD
Output power(dBm) -5 dBm~-7 dBm (9 um/125 um)
Modulation CW, 270 Hz,1 KHz, 2 KHz
Output Stability <=±0.05 dB
Operating Time 10 Hrs (Continuous)
Power supply Alkaline Battery
Power adapter 8.4 V
Fiber connector FC/PC
Dimensions 7.5 in × 4.0 in × 3.5 in (192 mm ×102 mm × 90 mm)
Weight 0.74 lbs (0.338 Kg)

Additional Information


  • Telecommunication project maintenance
  • CATV project maintenance
  • Data network project maintenance
  • Other optical fiber projects
  • Optical communication teaching and research

Control Panels



Functions Explanation

  1. Light Output Port: GAO-OTS-101 uses the FC adapter for light output port.
  2. Large LCD Screen: Displays various menus, battery capacity and etc.
  3. Press “ENTER” key to access the main function or confirm an operation.
  4. Press “CANCEL” key to return to the upper menu or cancel an operation.
  5. Press “B_LIGHT” key to on/off the background light or change the background light color.
  6. Press “↓↑” key to browse the main menu.
  7. Press “ON/OFF” key to turn on/off the equipment. The equipment will automatically shut-down after 10 minutes of idle time.
  8. DC Port: Power source adapter connection, when battery indicator light up on the LCD screen, please charge the equipment.
  9. MIC Port: It is used to insert the microphone.
  10. PHONE Port: Connects with PHONE to establish a conversation.

Operating Instructions


  1. Press “ON/OFF” key to turn it on, a menu will appear as shown below:
  1. Press “ON/OFF” key to turn it off. The unit will turn itself off after ten minutes of idle time.
  2. The symbol on the bottom right corner. (“√” shows channel is established; “×” shows channel has not been established).

From the symbol, you can start a conversation or wait for the opposite party to turn its unit on.

     Main Menu

  1. After turning on the unit, the main menu will appear on the screen. Press “↓↑” key to browse the menus and press “ENTER” key to access the sub-menu.
  2. GAO-OTS-101’s main menu has the following two working modes (from top to bottom): Talk set and Light source.      

Talk Set Working mode: Press “ENTER” to access the Talk Set menu:

  1. There are four functions available in Talk Set menu: “Reset”, “Call”, “Local λ” and “Remote λ”. Press “↓↑” to browse the four functions. Press “ENTER” key to confirm the operation.
  2. Press “RESET” to re-establish the digital channel. If the digital channel is successfully established, the

LCD screen will be as below:

  1. 3. Press “Call” to call the opposite party and make its telephone ring. Then Press “Local λ” to display the unit’s laser wavelength.

  “Light source” Working mode      

  1. Press “ENTER” to access the Light Source menu
  2. In the menu, there are four functions available to choose from: “CW”, “270Hz”, “1kHz”, “2kHz”.

Press “↓↑” to browse the four functions. Press “ENTER” key to confirm the operation.

  1. Press “CW” to access the steady light source working mode.

Background Light

There are seven background light colors in GAO-OTS-101; they are yellow, blue, purple, white, red and two types of green color. Press “B_LIGHT” key to turn on /off the background light. Then press “↓↑” to change the color within 3 seconds or directly press “ENTER”.


  • When the battery indicator on bottom left corner is empty, please charge the battery as this indicates battery is flat.
  • Please note the indicator lamp when charging.
  • Please turn off the talk sets if the battery is low.
  1. Earphone Use the volume control on the earphone to increase or reduce the volume.

    Please Note: In order to realize the long distance conversation over a single fiber, we must use one set of talk sets. Each of them must have different wavelength, the typical combination is 1310 nm and 1550 nm. GAO-OTS-101 has full duplex voice communication. Please do not connect it to the other brands of talk sets. 


  1. Please clean the sensor’s surface regularly to keep it free of dust and oil. Do not use unclean and non-standard connectors. Do not insert the bad polished surface to avoid mangling the sensor’s surface and the whole system performance.
  2. Please use the same type of adapter only.
  3. Please screw back the dust protective cap if not in use for a period time.
  4. Please gently insert/pull out the connector to avoid scratching the surface.
  5. Please use a cotton bud to clean the sensor’s surface regularly.
  6. If the equipment will not be used for a period of time, remove the batteries to keep the battery from damping.

             Common Problems

Problems Possible   Reasons Solutions
LCD display is faint Insufficient power Replace the batteries or charge the rechargeable battery
No display after turning on Insufficient power Replace battery or Restart the unit
Readings on the LCD screen remain the same or fluctuant slightly after turning on Problem with the connector or the display is locked Inspect the connection of the connector or clean the sensor’s surface

Standard Accessories

Name Quantity
GAO-OTS-101 Light Source/Talk Set Machine 1
Earphone 2
Operating Manual 1
Protective Cover 1
Rechargeable Batteries+ Adapter 1
Cotton Bud 1

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