Features

  • Digital frequency generation with full phase control
  • RF performance matched with Ba+ EOM models
  • Automatic EOM resonance lock (Q-Lock)
  • Frequency drift compensation (F-Lock)
  • Various system integration and interlock interfaces
  • PC interface (Python) via USB
  • Standalone device with simple plug & play operation

Typical Applications

  • RF driver for resonantly enhanced laser modulators
  • Broadband frequency source for fiber-based modulators from iXblue
  • Versatile frequency synthesizer for the lab

Exemplary datasheet

QD - Ba+
QD - Ba+_8.0W2
Output power P1dB (dBm) 33 @ 8.0G
Synthesizer module QDG8
RF Amplifier module
Protected output
Q - Lock
F - Lock optional
Matching EOM(s) PM - Ba+_8.0M2
Select your model

Required Information

Additional Information
Quantity

Choose Your Options

External Ref. Clock: +CLK

  • external reference input
  • frequency range: DC - 100MHz
  • connector: BNC, 50Ω

ns RF switch: +S

  • rise | fall time: ~ 50 | 15ns
  • isolation: typ. 75dB
  • connector: BNC, 50Ω

Frequency Lock: +FL

  • ensures conformity (<kHz resolution) between modulation & EOM frequency
  • target freq. adjustment via front panel
  • enable / disable via ext. trigger (BNC)
  • including utensils for EOM T-ctrl.

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Background Information
Fig. 1 | Q-DRIVERS can be used with resonant modulators which are characterised by a limited bandwidth, an input signal enhancement and a 50Ohm impedance.
Fig. 2 | Traveling Wave modulators ( typical frequency response) can be operated by Q-DRIVERS due to their (quasi) impedance matching up to GHz.
Fig. 3 | The Q-DRIVERS slot card interface allows flexible upgradeability.

Resonant

With the Q-DRIVER concept QUBIG offers dedicated RF systems which match and enhance the features of all free-space resonant modulators. Digital frequency synthesis allows precise frequency and phase control. An integrated resonance lock (Q-Lock) working up to 19GHz automatically finds and subsequently tracks the fre- quency of the modulators which ensures an operation at optimal efficiency. Together with the automatic frequency drift compen- sation (F-Lock) QUBIG’s RF drivers have become a plug & play sys- tem where only two input parameters need to be adjusted: the de- sired frequency and modulation depth.

Traveling Wave

QUBIG’s Q-Drivers are also suited for traveling wave modulators. Dedicated digital synthesiser modules with signal bandwidths from 20MHz up to 8 or 19GHz are conform with the bandwidth performance of the EOMs. Depending on the application, broad- band RF amplifiers with an output power up to 10W within a frequency range of several GHz must be properly chosen for the respective application.

Q-Drivers (QD)

Q-Drivers are based on a sophisticated modular concept that al- lows flexible and easy adaptation to a wide variety of applications by simply plugging in functional modules in a slot card interface. The basis driver module contains besides a digital frequency syn- thesiser all necessary components (power supply, RF amplifier, user interface, various interlock functions etc.) for a standalone opera- tion. For convenient system integration, besides the hardware QUBIG also allows to control/communicate with the driver remote- ly by PC via a Python interface.

Typical Applications

The Q-DRIVERs are conceptualised for QUBIG’s free-space light modulators with 50Ohms impedance. Due to their compact design and flexible upgradeability, new applications have emerged over time:

Fig. 1 | Collection of QUBIG’s free-space resonantly enhanced electro-optic modulators.
Fig. 2 | Basic concept of an acousto-optic modulator.
Fig. 3 | Optical waveguide based fiber modulator from iXblue.

Free-space Electro-Optic Modulators

For all applications that rely on free­space elec­ tro­optic modulators, such as laser cooling, spectral broaden­ ing or laser frequency stabilisa­ tion, QUBIG provides matching RF drivers with tailored per­ formance features like Q­Lock, Temperature controller, suitable RF power amplifier and conven­ ient Python interface for remote control.

Acousto-Optic Modulators

Drivers of the QDR­Series can be optimised for resonant or broad­ band Acousto­Optic modulators (AOM) as well which are com­ monly used in various applica­ tions like acousto­optic tunable filters (AOTF), acousto­optic deflectors or frequency modulators.

Acousto-Optic Modulators

Fiber­based Modulators are characterised by very low half­ wave voltages and large band­ widths. QUBIG’s QDG­Series comes in two basic configura­ tions that cover a frequency range up to 8 or 19GHz. In combination with amplitude and frequency modulation features many interesting appli­ cations in metrology, communi­ cations or quantum science become accessible.

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