Koheras MIKRO

Koheras MIKRO – single-frequency OEM lasers

The Koheras MIKRO is the smallest industrial single-frequency DFB fiber laser on the market. The laser design ensures an inherent and robust single-frequency operation without any mode-hops. And the low phase noise and narrow linewidth make it ideal for OEM integration in industrial sensing systems.

With thousands of lasers installed in industrial sensing systems worldwide, the Koheras MIKRO sets the standard for performance and reliability.

Key Features

Compact OEM footprint

Robust single frequency operation

Low phase noise and narrow linewidth

High wavelength stability

PM and fast frequency tuning option

Models and options

Wavelength range 1535 – 1580 nm
Output power 40 mW
Polarization-maintaining operation. Fast wavelength tuning.

Want to know more?

Get in touch with one of our Koheras laser experts and learn more

The standard wavelength is 1550 nm and the MIKRO is available with output wavelength anywhere in the 1535 to 1580 nm range. The laser offers a wide thermal wavelength tuning range and can be combined with fast wavelength modulation e.g. for external stabilization.

The lasers are available with PM (Polarization-Maintaining) or non-PM output.

For easy control, the MIKRO is available with an optional USB interface kit and can be controlled via our user-friendly CONTROL graphical user interface.

Want more details?

If you want more details about phase noise, spectral linewidth, frequency stability, or how to wavelength tune your Koheras laser, we have some application notes for you.

Laser phase noise is a frequency-domain view of the noise spectrum around the laser signal. Read more about phase noise in single-frequency lasers.

Spectral linewidth is a measure of the spectral content of the laser light. Read more about linewidth measurement methods.

The laser’s frequency stability is often described in terms of its spectral linewidth. However, this term lacks detail about the laser frequency noise which is often critical in laser applications. Read the analysis of the laser frequency stability using beat-note measurement.

The wavelength of the laser is controlled by the temperature and strain of the DFB cavity. Learn how to tune your Koheras laser.


Choose model:
Laser emission
CW – inherently single frequency
Beam quality
M² < 1.05
Linewidth 1)
< 0.1 kHz
Max phase noise @10 Hz
-90 dB((Rad/√Hz)/m)
Max phase noise @100 Hz
-110 dB((Rad/√Hz)/m)
Max phase noise @20 kHz
-130 dB((Rad/√Hz)/m)
Max phase noise @10 Hz
32 (µrad/√Hz)/m
Max phase noise @100 Hz
3.2 (µrad/√Hz)/m
Max phase noise @20 kHz
0.3 (µrad/√Hz)/m
RIN peak
app. 0.7 MHz
RIN level @ peak
<-100 dBc/Hz
RIN level @10 MHz
<-135 dBc/Hz
Optical S/N (50 pm res.)2)
> 50 dB (typ. > 55 dB)
Min thermal wavelength
tuning range3)
± 150 pm
Total thermal tuning range
450 pm
Fast wavelength
modulation range
> 8 GHz
Fast wavelength modulation
< 20 kHz
PM output – PER
> 23 dB

1) 120 µs integration time.

2) >47 dB (typ. > 52 dB) for non-PM version.

3) Relative to center wavelength at room temperature. If the laser is operated in very cold or hot environments, this wavelength range is truncated on either the upper or lower side.

Dimensions (WxHxD)
70 x 20 x 150 mm
0.35 kg
Operating temperature range 1)
+15 to +60°C
Humidity, non-condensing
0-70 % RH

1) Module temperature.

Power supply requirements
12 VDC
Power consumption
Typical 4 W, max 10 W
Communication interface
Optical output
FC/APC (0.5 m pigtail)