Balanced detector


800 MHz frequency band balanced detectors
(Optimal wavelength band: 1.0 μm)


C12668-05 is a differential amplification type photoelectric conversion module containing two Hamamatsu photodiodes with balanced characteristics. The photodiodes are connected in a direction that cancels out the photocurrent of each photodiode. This configuration cancels out the common mode noise of the two incident light rays. The minute difference in light levels is treated as a displacement signal, converted into an electrical signal, and output. This product can be applied to optical coherence tomography (OCT) used in ophthalmologic examinations and the like. The balanced detector can convert into electrical signals the minute difference in the signal light produced when the back scattering light from the subject is made to interfere with the reference light.

-Cutoff frequency: 800 MHz
-Common-mode rejection ratio (CMRR): 30 dB typ.
-Input section: FC receptacle (APC polished)
  A single-mode fiber with an FC connector can be connected.
-Output section: SMA receptacle


Application example




The wavelength-swept light source sweeps the wavelength temporally and shines its output light on the sample, and the generated interference light is detected with a differential detector. An image in the depth direction of the sample is acquired by Fourier transforming the obtained wavelength information.

Dimensional outline (unit: mm)

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