Laser synchronization controller
The repetition rate of a mode-locked laser is dependent on the cavity length.
Synchronizing a modelocked laser to an external source means stabilizing the
cavity length. This is usually done with a piezo. This piezo covers he whole
audible range of frequencies. Additionally, the temperature drift has to be
compensated. This may be achieved with a servo or with a picomotor.
The featured controller is able to handle either of them.
- frequencies in the range of 50 .. 200 MHz, custom made in frequncy bands
50 .. 100MHz, 80 .. 150MHz, 120 .. 200MHz, 150 .. 250MHz, ... , upon request
- subharmonic locking on request
- external photodiode input signal 6..30mVpp into 50 Ohms, other levels on request,
bias voltage +15V or -15V selectable
- reference input signal -3 .. 3dBm, ultra low phase noise, eg HP 8662, HP 8663
- low voltage piezo output 0..150 V (according to supply), thermally protected amplifier,
selectable lowpass filter
- locking range is a few 10kHz with a servo
- achievable jitter <= 1ps rms, soliton pulses may achieve even lower values
- RS485 & RS232 communication to the PC
- comprehensive Windows GUI
- supports a pushbutton and a LED for standalone operation
- required supply voltages : +5V, +-15V, 120 .. 150V
- pcb size is approx 254mm x 79mm
- not RoHS compliant, but currently exempt
The 350MHz sync prototype
A prototype of a synchronization controller running at 350MHz was successfully
shipped. The measured jitter on a soliton system was well below 500fs even without
Shown is the RF part at an intermediate assembly stage.
some target specs :
laser input level : -40..-20dBm
reference input level : -10..+10dBm
Production depends on the request.
The applied technology is assumed to be useable well beyond 500MHz.
Questions or Request a quote
last update: 26.may.06 or perhaps later
Copyright (99,2006) Ing.Büro R.Tschaggelar