Abstract
We propose all-fiber mode multiplexer composed of two consecutive LP₁₁ mode selective couplers that allows for the multiplexing of LP₀₁ mode and two-fold degenerate LP₁₁ modes. We demonstrate WDM transmission of 32 wavelength channels with 100 GHz spacing, each carrying 3 modes of 120 Gb/s polarization division multiplexed quadrature phase shifted keying (PDM-QPSK) signal, over 560 km of few-mode fiber (FMF). Long distance transmission is achieved by 6×6 multiple-input multiple-output digital signal processing and modal differential group delay compensated link of FMF. The all-fiber mode multiplexer has considerable potential to be used in mode- and wavelength-division multiplexed transmission.
Highlights
Mode-division multiplexing (MDM) is one of the promising approaches in space-division multiplexing (SDM) transmission technology that is considered for overcoming current limitation of the transmission capacity in a single mode fiber [1,2,3]
In the previous works of [12] and [13], we proposed an all-fiber mode multiplexer based on mode selective fiber couplers (MSC)
The experiments demonstrate that MDM-WDM optical transmission over long distance of the few-mode fiber (FMF) is possible by using the all-fiber mode multiplexers
Summary
Mode-division multiplexing (MDM) is one of the promising approaches in space-division multiplexing (SDM) transmission technology that is considered for overcoming current limitation of the transmission capacity in a single mode fiber [1,2,3]. Fiber or waveguide based approaches make mode multiplexing simpler and more practical due to low loss and compactness It includes mode multiplexing by photonic lanterns or 3-dimensional waveguide that bring the waveguide cores closer together [7, 8]. The signal input in each core couples to an orthogonal combination of modes in the FMF Another approaches including long-period gratings [9], tapered couplers [10] and mode selective couplers [11,12,13] used the coupling between the LP or waveguide modes. In the previous works of [12] and [13], we proposed an all-fiber mode multiplexer based on mode selective fiber couplers (MSC) It has intrinsically low loss and it can be directly connected to the transmission fiber. The system MDL evaluated from the estimated 6 6 impulse responses proves that the all-fiber mode multiplexer can be used for long distance MDM-WDM transmission
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