EXTERNAL CAVITY TUNABLE LD LIGHT SOURCE ECL-210
4-1
4
Principle of Operation
FIG.1. Structure diagram of ECL-210
4.1. ECL Principle of Operation
FIG.1 shows the structure of ECL-210.
To the semiconductor laser (LD), employed is a Fabry-Perot type LD whose one end surface is
coated by AR (anti reflection). In the LD block, an inside lens and output lens in an external
cavity to configure an external cavity and Frequency Lock Filter, and an isolator to prevent return
light from the outside are arranged in a temperature control is carried out by a peltier element in
a high precious manner.The light injected from AR coated surface of LD is collimated by the
external cavity inside lens, and its wavelength is selected by the optical band path filter (OBPF)
and frequency lock filter (FLF), and reflected by the external cavity mirror, and led from the AR
coated surface to LD by the external cavity inside lens once again. When current is supplied into
LD and the gain inside of LD becomes sufficient, laser oscillation is carried out by the external
cavity.
The laser light goes through tunable attenuator (ATT) (* 1) and bounded to the optical fiber. The
optical fiber is diagonally processed so as to prevent interference in fiber, and only connector for
output employs SPC. FC-APC connector, SC connector and polarization maintaining fiber out-
put are available as options.
The oscillation wavelength of ECL-210 is controlled by OBPF and FLF individually. The merit
of ECL-210 is these two independent components controlled.
ISO
L1
L2
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