Module variants
22
• Emission features – multiple features that control emission availability from
the laser.
Tuning is accomplished by either manual thermal tuning or using an external
signal applied at the laser’s fast wavelength modulation input port. A varying
external signal applied to the port, modulates the output wavelength. Modulating
the output wavelength can obtain improved stabilization when compared with
the free-running wavelength specification.
The standard output of the laser utilizes either standard single mode fiber or
optional polarization-maintaining fiber to improve the linear characteristics.
Improved polarization linearity is usually required when the laser output is either
externally modulated or frequency converted.
Theory of operation The BASIK is a fiber laser that uses a fiber Bragg grating cavity to produce an
output beam operating in single mode. The center wavelength of the laser is
configurable using either thermal substrate control or optional Piezo
components. Due to the special Bragg grating, the single mode operation is
constantly maintained and is stable over the entire operating frequency band of
the laser.
Module variants
The Koheras BASIK modules are available in four variants. The modules are
mainly classified by their wavelength
and output power. Table 1 describes the
primary technical differences between the variants.
Table 1 BASIK variant specifications
Configuration ID Koheras modules are defined by their configuration ID which includes the
options. Refer to Appendix F for a list of Koheras BASIK configuration IDs.
Center wavelength The center wavelength of BASIK lasers is set to 1550.12 nm (ITU DWDM C-BAND
Channel 34) or 1064.00 nm. The lasers can also be specially ordered from the
factory with other center wavelengths ranging from 1535 to 1580 nm or 1030 to
1120 nm.
Module Type Standard λ
Other λs
1
1. Fixed
Output
Power
Polarization
Maintaining
Fast Modula-
tion
X15 1550.12 1535 - 1580 nm
30 mW (fixed)
2
2. Actual value depends on the factory calibration
Yes Yes
E15 1550.12 1535 - 1580 nm
40 mW (max.)
3
3. Min. output ~30% of the maximum
Optional Optional
C15 1550.12 1535 - 1580 nm
>10 mW (fixed)
2
Optional Optional
Y10 1064.00 1030 - 1120 nm
>10 mW (fixed)
2
Yes Optional
2
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