title: Digital broadband linearization of optical links.
abstract: We present a digital postprocessing linearization technique to efficiently suppress dynamic distortions added to a wideband signal in an analog optical link. Our technique achieves up to 35 dB suppression of intermodulation distortions over multiple octaves of signal bandwidth. In contrast to conventional linearization methods, it does not require excessive analog bandwidth for performing digital correction. This is made possible by regenerating undesired distortions from the captured output, and subtracting it from the distorted digitized signal. Moreover, we experimentally demonstrate a record spurious-free dynamic range of 120 dB·Hz(2/3) over a 6 GHz electrical signal bandwidth. While our digital broadband linearization technique advances state-of-the-art optical links, it can also be applied to other nonlinear dynamic systems.
authors: Department of Electrical Engineering, University of California Los Angeles, Los Angeles, California 90095, USA. dwlam@ucla.edu
authors: Daniel
authors: D
authors: Lam
authors: Ali M
authors: AM
authors: Fard
authors: Brandon
authors: B
authors: Buckley
authors: Bahram
authors: B
authors: Jalali
mesh_terms: D016477:Artifacts; D016014:Linear Models; D055096:Optical Devices; D011846:Radio Waves