GAOTek Fiber Optical Multimeter

This Handheld Optical Multimeter is an ideal test instrument for the accurate installation, operation, and maintenance of fiber optic networks.



The GAOTek Fiber Optical Multimeter provides a wide range of optical power measurements for one to four wavelength laser ranges with stable output. It can provide a single 650 nm visible red light, dual-wavelength 1310 nm and 1550 nm laser output using single-mode fiber, or provide 850 nm/1300 nm/1310 nm/1550 nm four wavelength laser output. This is an ideal test instrument which comes with an automatic shut-down feature, wide range of optical power measurements, and a general interface design. Additionally, both linear (mW) and non-linear (dBm) indices display on the same screen. It is an useful device for maintenance of fiber optic networks.


Key Features

  • Handheld, easy to use device.
  • User Self-calibration
  • Rechargeable lithium battery used to reduce user costs
  • Linear (mW) and non-linear index (dBm) display on the same screen
  • Can set the automatic shut-down function
  • High stability multi-wavelength single and multi-mode laser output, CW mode or modulated mode
  • Color LCD display
  • Data can be uploaded to PC



Technical Specifications

Power Meter Parts
Measurement Range -70 dBm ~+3 dBm or -50 dBm ~+26 dBm
Type of Probe InGaAs
Range of Wave Length 800 nm ~1700 nm
Uncertainty ±5 %
Standard Wave Length 850 nm, 980 nm, 1300 nm, 1310 nm, 1490 nm, 1550 nm
Resolution Linear indication: 0.1 % Logarithmic indication: 0.01 dBm
Connector General Setup: FC/PC SC/PC

Other Setup: LC/FC/SC/ST

Many common interface

Light Source Parts
Type        A     B     C  D
Working Wavelength 650 nm red light source 1310 nm/1550 nm 1310 nm/1550 nm +

650 nm red light source

Light Source

(1310 nm/1550 nm/1625 nm)

Others: customized by the customer
Light-Emitting Device FP-LD
Optical Output Power -7 dB/-7 dB -7 dB/-7 dB red light source: 1 mW 0 dB-7 dB
Modulation CW/270/1 K/2 K
Type of Optical Fiber SM, MM
Connector FC/PC
Multi-Mode Output Power ≥–20 dBm
Resolution Linear indication: 0.1% Logarithmic indication: 0.01 dBm
Working Temperature 3.2 °F ~ 140 °F (-16 °C ~ 60 °C)
Storage Temperature -13 °F ~ 158 °F (-25 °C ~ 70 °C)
Auto Power-Off Time 10 min
Continuous Working Hours more than 15 hours
Display 2.4” TFT color LED with backlight
Dimensions 7.48 in* 3.93 in* 1.88 in

(190 mm*100 mm*48 mm)

Power Supply Rechargeable lithium battery
Weight 0.61 lbs. (280 g)




Additional Information

Function keys

  Power on/off or Auto-shutdown set

  Exit the current operation without save

 Function selection, data increase

   Function selection, data decrease

  Enter the menu or select the current operation

 Operating Instructions

Power On:  Press   to power on, and then will display the following interface

Power Off : When the meter is power on, press   for 2 seconds to power off.

Meter Set-up             

  • Enter the setup interface
  • Select meter setup
  • Press ENTER, and display the following interface
  •  Press MENU to select function, for example, select light source wavelength.
  • Press   or  to select sub item, for example: select wavelength as 1490 nm.
  • Press  to save setup and return to setup interface
  • Press to cancel, and return to setup interface.


  • Enter the setup interface, select language, press  and display the following interface.
  • Press  or   to select function item Return to setup interface and set language of your option.

 Date and Time

  • Enter the setup interface, select time, press   and display the time set interface
  •  Press MENU to select item or   to   value, Press  to apply and return to setup interface.
  • Press   to cancel and return to setup interface, after pressing , if the time is incorrect, cursor will            focus on the error. Only correct format of time is considered.
  • Press MENU at main interface, press   or   to move cursor, select file item
  • Press  to enter file interface, and display the following interface.

Saving the Document 

  • Press  or   to move cursor, to move command item cursor. When command cursor is on “lookup”,             Press   to view current file results.
  • When command cursor is on “prev” or “next”, press   to page up or down.
  • There are “delete”, “empty” commands and so on.

Calibration settings

Calibration settings are used to set the Offset size. Displayed value is the overall power to add a value.

  • Enter the setup interface, select Calibration item, press to enter Calibration interface.
  • Press MENU to select items. Press   or   to increase or decrease value by 0.01. When selected item is “save”, press   to apply.
  • When selected item is “default”, press  to restore to default.

Data upload

 Measurement results can be stored in the instrument, or stored in the instrument through the host computer.

As long as the data line of a termination on the local PC Link interfaces, the other side access to PC-USB port, open the PC software, PC software by default settings, and then upload directly to the PC point, the data can be reached the PC.

Maintenance and Precautions

  • Don’t watch the output port with eyes while it is running, the laser will hurt your eyes
  • If you are not going to use the tester for long time, cover the dust-proof cap immediately to keep the end clean, don’t expose it in air for long time, otherwise dust may gather polluting the output end.
  • After the stabilized light source works for a time, dirt or dust may gather at output end reducing output optical power, if so, user can gently wipe the surface using cotton swab dipped with alcohol, then remove the contaminants with dry cotton swab. If end still look dirty after doing so, please contact us
  • For any other fault, please immediately contact our technician, don’t open the cabinet of the device to repair it by yourself, otherwise more serious problems may occur. We will not repair any product that have been disassembled by user himself


  Trouble Shooting

SI No Diagnosis Solution
1 Output light is found unsteady Please recharge the battery
2 The terminal of adapter is dirty Clean it gently with alcohol
3 The output optical power is unsteady after start-up Pre-warm the device for 15 minutes before using it.

Standard Accessories

  • Main Body
  • Rechargeable lithium battery (in the battery cartridge)
  • Warranty card
  • User Manual
  • Pass Certificate
  • Soft carrying bag
  • Charger
  • Cleaning rod


Content missing