title: Spectrally balanced detection for optical frequency domain imaging.
abstract: In optical frequency domain imaging (OFDI) or swept-source optical coherence tomography, balanced detection is required to suppress relative intensity noise (RIN). A regular implementation of balanced detection by combining reference and sample arm signal in a 50/50 coupler and detecting the differential output with a balanced receiver is however, not perfect. Since the splitting ratio of the 50/50 coupler is wavelength dependent, RIN is not optimally canceled at the edges of the wavelength sweep. The splitting ratio has a nearly linear shift of 0.4% per nanometer. This brings as much as +/-12% deviation at the margins of wavelength-swept range centered at 1060nm. We demonstrate a RIN suppression of 33dB by spectrally corrected balanced detection, 11dB more that regular balanced detection.
authors: Yueli
authors: Y
authors: Chen
authors: Daniel M
authors: DM
authors: de Bruin
authors: Charles
authors: C
authors: Kerbage
authors: Johannes F
authors: JF
authors: de Boer