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Fiber modulator: a high speed intensity modulator and optical switch

This fiber modulator is a lossless, low noise, high speed (nanosecond), high dynamic range, high extinction ratio solution available from 750 to 1700 nm.

It is a very compact SOA-based unit optimized for single-shot to CW performance with pulse width down to 1 nanosecond. This fiber modulator delivers precision pulses which are generated internally by an on-board pulse generator, or on demand from an external TTL signal. SOM (Semiconductor Optical Modulator) can be compared with AOMs, EOMs or direct laser diode modulators. It is the only solution meeting all the constraints for a reliable, stable and efficient fibered intensity modulation.  

Choose your wavelength on the datasheet table or contact us for other wavelength. See our tutorial: fiber modulator basics.

Product reference: SOM


Key features

  • Lossless device
  • High dynamic range: >48 dB
  • High speed: down to 500 ps rise/fall
  • High extinction ratio: >50 dB
  • User design pulse shape
  • Very low noise and stable signals
  • No wavelength evolution along the pulse duration


The GUI software lets the user have total control of all module functions. It includes several libraries for software integration (Labview VIs, DLLs, Hexa etc.).

Datasheet & tutorial

This fiber modulator works alone or in series with other products in our range like: 

Complex systems, such as fiber lasers, can be quickly developed on this module platform.


Version SOM standard SOM HPP (High Pulse Performance) SOM shape (user design pulse shape)
Wavelength (nm) Any wavelength to be chosen between 700 and 1650 nm
Optical bandwidth (nm) From 20 nm to 110 nm to be selected
Extinction ratio (dB, typ) > 50 dB
Switching speed (ns, typical) 1 ns 0.6 ns 2 ns
Dynamic range 60 dB 60 dB 48 dB
Small signal gain From 22 to 40 dB depending on the selected wavelength (see wavelength table next page)
Trigger-to-pulse jitter < 8 ps < 20 ps < 2 ns
User design pulse shape no  no yes
Max repetition rate 250 MHz 250 MHz 20 MHz
Max output power From 20 to 100 mW  (more than 500 mW have been measured in some pulsed configuration)
Interface/compatibilities and libraries USB - Windows 7/10 - DLLs - Hexa - Labview

GUI interface

Exemple d’impulsion optique de 40 ns obtenue par modulation externe d’une diode laser DFB à 1064 nm
Example of a SOM-std 40 ns pulse shape from an input 1064 nm DFB laser diode.
Exemple de forme d’impulsion arbitraire obtenue par modulation externe d’une diode laser DFB à 1064 nm obtenue avec SOM-Shape
Example of a user-defined pulse shape with SOM-std internal AWG from an input 1064 nm DFB laser diode.


  • Laser seeding
  • LIDAR testing

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