Spectrally balanced detection for OFDI

Yueli Chen; Daniel M. de Bruin; Charles Kerbage; Johannes F. de Boer

doi:10.1117/12.761015

5 March 2008 Spectrally balanced detection for OFDI

Yueli Chen, Daniel M. de Bruin, Charles Kerbage, Johannes F. de Boer

Proceedings Volume 6847, Coherence Domain Optical Methods and Optical Coherence Tomography in Biomedicine XII; 684710 (2008) https://doi.org/10.1117/12.761015
Event: SPIE BiOS, 2008, San Jose, California, United States

Abstract

Balanced detection is required to suppress relative intensity noise (RIN) in optical frequency domain imaging (OFDI). Because a 50/50 fiber coupler does not provide a 50% splitting ratio over the full sweeping wavelength, balanced detection by the coupler's differential output with a balanced receiver is not perfect. We have designed a new balancing scheme that detects two outputs of 50/50 coupler separately and corrects the spectral deviation in the digital domain. A better balanced detection scheme has been designed in this work. In stead of detecting the hardware balanced signal from the 50/50 fiber coupler, we digitize the two channel fringe signal independently and perform the signal balancing in the poset process. The new software based balancing significantly improves the RIN suppression. Afterward, a systematic noise analysis has been performed on the 1050nm OFDI system. The results demonstrate a RIN suppression of 33dB by spectrally corrected balanced detection, which is 11dB more that regular balanced detection.

Citation Download Citation

Yueli Chen, Daniel M. de Bruin, Charles Kerbage, and Johannes F. de Boer "Spectrally balanced detection for OFDI", Proc. SPIE 6847, Coherence Domain Optical Methods and Optical Coherence Tomography in Biomedicine XII, 684710 (5 March 2008); https://doi.org/10.1117/12.761015

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