We propose a new method to increase the sensitivity of Optical Coherence Tomography (OCT) beyond the conventional
shot noise limit using optical amplifiers. Criterion for effective use of optical amplifiers for OCT is discussed.
Enhancement of OCT images is demonstrated with optical frequency domain reflectometry (OFDR) OCT.
We have been developing a unique discretely swept optical frequency domain imaging (OFDI) using superstructured-grating
distributed Bragg reflector (SSG-DBR) lasers. To increase resolution, four SSG-DBR lasers are being developed
to obtain spectral coverage of 160 nm in total. To increase speed of D-OFDI imaging, simultaneous scanning of multiple
sources with a parallel OFDI system and unique transversal scanning D-OFDI have been demonstrated. Introduction of
an optical amplifier can increase sensitivity beyond the conventional shot noise limit. A deep 12 mm depth range has
been demonstrated with the wavelength interval of 0.05 nm.
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