Optical Variable Attenuator TW3303

Fiber Testing Instrument

Optical Variable Attenuator TW3303

Optical Variable Attenuator TW3303 handhold optical variable attenuator is used for continuously variable optical signal attenuation. As the attenuator is used in the laser system for the on-line testing, there, thereforeTW3303 can be used in the digital system of communication devices (such as: PHD, SDH) and also in the system of adopting analog modulation (CATV)







  • Telecom Maintenance
  • CATV Maintenance
  • Comprehensive cable construction system
  • Optical instruments research and development
  • Optical communication education and lab testing
  • Other optical project
  • stepwise attenuating by circumgyrated dial: attenuating step 0.05dB
  • Provide with the function of displaying dB and dBm attenuating value
  • Alternative function of 10 minutes Auto-off without operation
  • After off the instruments, the system will have the memorizing of the attenuating value and the attenuating step, in order to restore the system back to the previous shut down state when open the instruments next time


Type TW3303
Attenuating wavelength Range 1260~1650nm
Fiber Model 9/125um SM
Optical Connector FC/PC
Calibrated wavelengths 1310/1490/1550/1625
Measurement Range 2.5~60dB
Resolution 0.05dB
Minimize Insertion Loss <2.5dB
Linearity ±0.5dB
Repeating ±0.2dB
Attenuating Accuracy ±0.8dB
Back Reflection >35dB(typical value40dB)
Max input +20dBm
Displaying type lattice 128*64 black and white, white back ground light
Rechargeable batteries 7.4V
Power supply adaptor 7~8.5V
Operation temperature 0~40℃
Storage temperature -10~60℃
humidity 0~85%(non- condensation)
Weight 450g
Standard Packages
TW3303 TW3303 Optical Variable Attenuator, Protective Rubber Boot, Rechargeable battery, Power Supply Adaptor, Instruction Manual and Cotton Tampon. Rigid Carry Case can be optional

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