Modern spectrally efficient optical communication systems utilize polarization-multiplexed
coherent transmission in complex modulation format. Coherent receivers used in these …

We present a novel statistical moments-based method for optical signal-to-noise ratio
(OSNR) monitoring in polarization-multiplexed (pol-mux) coherent optical systems. This …

As 100-Gb/s digital coherent systems enter commercial deployment, an effort is underway to
uncover the technologies that will enable the next-generation optical fiber communication …

A three-dimensional index-stress distribution (3DISD) measurement method for determining
concurrently the refractive-index distributions (RIDs) and residual-stress distributions (RSDs) …

The combination of polarization-multiplexing (pol-mux) high-order quadrature-amplitude-
modulation (QAM) format and non-data-aided (NDA) channel equalization largely enhances …

We propose a simple approach to manipulating the constellation of a multilevel modulation
signal in the optical domain. By exploiting degenerate four-wave mixing (FWM) in highly …

In this thesis, digital signal processing (DSP) algorithms are studied to compensate for
physical layer impairments in optical fiber coherent communication systems. The physical …

We report a two-stage blind frequency domain equalization method for long-haul coherent
polarization-multiplexed (pol-mux) systems using quadrature phase shift keying (QPSK) and …

Hybrid integrated photodetectors with flat-top steep-edge spectral responses that consist of
an Si-based multicavity Fabry–Perot (F–P) filter and an InP-based pin absorption structure …

A novel long wavelength photodetector with dual-wavelength spectral response is designed
and fabricated using a step-shaped Fabry-P'erot (FP) filter structure. The step-shaped …