Microstructured Optical Fiber, Supercontinuum Light Source Comprising Microstructured Optical Fiber and use of Such Light Source

An optical measurement system comprising a supercontinuum light source, the supercontinuum light source comprising:

• a microstructured optical fiber configured to generate supercontinuum light from seed light having a seed wavelength, λ1,
• wherein the microstructured optical fiber comprises:
• i. a core region configured to guide light along a longitudinal axis of the microstructured optical fiber, and
• ii. a first cladding region that surrounds the core region,
• wherein the microstructured optical fiber has a length and the longitudinal axis is along the length;
• a pump light source arranged to generate seed light at the seed wavelength, λ1, and to feed the seed light into the core region at an input end of the microstructured optical fiber, whereby the supercontinuum light is generated in the microstructured optical fiber;
• wherein the pump light source comprises at least two units in optical communication with each other, wherein the at least two units comprises a first unit and a second unit, which in combination are configured to generate the seed light, and wherein the first unit is a pump unit configured to generate pump light and transmit the pump light into the second unit, wherein the second unit is a seed unit configured to generate the seed light dependent on the pump light;
• a detector in optical communication with the seed unit;
• and
• a control unit configured to receive an active feedback signal from the detector and modulate output from the pump light source without direct dependency from the pump light.