Abstract
Spatial light modulation can be used to address specific fiber modes, as required in mode-division multiplexed systems. We theoretically compare phase-only spatial light modulation to a combination of amplitude and phase spatial light modulation in terms of insertion loss and crosstalk for a fiber supporting 11 LP modes. We experimentally demonstrate selective mode excitation using a Liquid Crystal on Silicon (LCoS) spatial light modulator configured to as phase and amplitude modulator.
Highlights
We experimentally demonstrate selective mode excitation using a Liquid Crystal on Silicon (LCoS) spatial light modulator configured to as phase and amplitude modulator
In order to support the exponential growth of the Internet traffic demand in fiber optic communication systems, multiple degrees of freedom for the optical signal have been exploited over the past decades [1], such as increased symbol rates, wavelength-division multiplexing (WDM), polarization-division multiplexing (PDM) and higher-order modulation formats
Possible reasons are that the incident beam diameter fits more to LP01 than to LP11 and that the required phase jump for LP01 leads to additional attenuation in the non-perfectly aligned optical setup
Summary
In order to support the exponential growth of the Internet traffic demand in fiber optic communication systems, multiple degrees of freedom for the optical signal have been exploited over the past decades [1], such as increased symbol rates, wavelength-division multiplexing (WDM), polarization-division multiplexing (PDM) and higher-order modulation formats. In few-mode fibers (FMFs) the size and the refractive index profile of a single fiber core is chosen such that several propagation modes are supported by the fiber Owing to their mutual orthogonality, these modes, albeit coupled by fiber imperfections, can be used as individual communication channels through multiple-input multiple-output (MIMO) digital signal processing [7]. To the above static mode shaping techniques, dynamic and adaptive spatial light modulators (SLMs), such as reflective liquid crystal on silicon (LCoS) devices can be used for mode shaping [28,29,30] Regarding the latter, mode multiplexers that shape the phase but not the amplitude of the spatial optical profile to be coupled into the FMF have so far been used. In this work we theoretically investigate and experimentally demonstrate beam shaping of both phase and amplitude using a LCoS modulator and discuss its relevance for coupling into higher-order modes of few-mode fibers
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