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Optical Modulator Driver Amplifiers and Semiconductor Materials

Notes on Handling Ultrafast Electronic Devices

Power-supply spikes, surge currents, or static electricity can degrade or damage our ultrafast electronic devices. This note explains the basic precautions to assure the safety and long-term stability of these devices.

Notes on Storage

To maintain product quality, the storage environment must be managed to protect against high temperature and humidity, active gases, static electricity, vibration, radiation, etc. Use antistatic storage containers and do not subject stored devices to vibration and mechanical shock. In addition, keep devices at least about 50 cm from objects without anti-static measures.

Preparations for Use

Ultrafast electronic devices requiring a power supply, are easily damaged and degraded by power spikes and surge current. Always take adequate care to power supply and antistatic measures.

Power Supply

  • To prevent forward or reverse surge current when powering-up, use a dedicated low-noise power supply with protective circuitry, such as a slow-start and slow-down design.
  • Poor contacts in the current-setting switch volume, as well as short circuits or disconnected wiring may cause deterioration of devices.

Static Electricity

Static Electricity
  • Even when an operator is grounded using a wristband, etc., take other antistatic precautions, such as antistatic gloves and shoes.
  • As well as ensuring that test instruments, benchtops, floors, shelves, tools, jigs, soldering irons, etc., are all grounded, be sure to use antistatic containers and trays. An ionizer is also an effective antistatic measure.

Precautions on Using Ultrafast Electronic Devices

Connecting equipment

  • Connect equipment after discharging static electricity in cables, etc.
  • Terminate all unused input/output connectors with a 50 Ω load. If output terminals are open, the reflected wave of the output signal may damage the device.
  • If connectors are connected/disconnected while the device is energized, the device may be damaged.
  • When connecting cables to high-frequency coaxial connectors, make sure they are tightened to the correct torque to prevent loosening. If the connector is overtightened, the connector may be damaged internally.
Coaxial Connector Torque
Coaxial Connector Torque (N-cm)
2.92 mm (K) 90
1.85 mm (V) 90
1.0 mm (W) 45


  • To avoid damage, always connect inputs/outputs before turning on the device power supply.
  • To avoid damage, always turn on/off the ultrafast electric device according to the specified sequence.

Using a Bias-Tee

Observe the following precautions when connecting an external bias-tee to the output of ultrafast electronic devices.

  • To prevent or relax transient voltages, it is recommended to insert a resistor in series between the power supply and DC input of the bias-tee.
  • Set the current compliance level of the bias-tee's power supply to an appropriate level for the DUT.
  • Apply voltage to the bias-tee only after all equipment connections are complete.
  • Turn off the bias voltage to the bias-tee before disconnecting any equipment.
General Bias-Tee Usage
General Bias-Tee Usage

General Precautions

High-speed electronic device products are hermetically sealed after being filled with nitrogen gas, so never de-lid or remove connectors. Note that de-lidding or connector removal voids service and warranty agreements. Some devices contain arsenic (As) compounds, so do not incinerate or shred at disposal and use an appropriately qualified specialist to process waste in accordance with national laws on hazardous products.
Note the following.

Ultrafast Electronic Devices

  • Dust and dirt on high-frequency coaxial connectors degrades high-frequency characteristics. When cleaning connectors, take antistatic precautions, such as grounding the operator. In particular, when wiping off dirt inside a connector, be careful not to generate static electricity from friction.
  • To avoid deterioration, connect/disconnect connectors while the power supply is off.
  • Do not exceed the absolute maximum rating; Anritsu will not accept any responsibility for damage and failure caused by mishandling or operation beyond rated specifications.

Optical Receivers

  • Touching the fiber cover and applying physical force, such as pulling, twisting, or bending the fiber risks breaking the fiber or causing damage.
  • Ensure that the minimum fiber radius of curvature is at least 30 mm. Light leaks from fiber may risk causing a fire.
  • Remove contaminants, such as dust and dirt, on the fiber facet and connector tip using an air blower or special cleaning cloth. Contaminants on the facet will increase connection loss.
  • Confirm that the power is off before connecting/disconnecting connectors.
  • Do not exceed the absolute maximum rating; Anritsu will not accept any responsibility for damage and failure caused by mishandling or operation beyond the rated specifications.
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