Spot-Based Mode Couplers for Mode-Multiplexed Transmission in Few-Mode Fiber

Ryf, Roland; Fontaine, Nicolas K.; Essiambre, R.-J.

doi:10.1109/lpt.2012.2220343

Cited by 64 publications

(31 citation statements)

References 10 publications

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“…In addition, due to the excellent autocorrelation properties of the transmitted sequences from the DACs, all transmitted channels guided into the mode-multiplexer can be considered to be independent and distinct. Several mode-multiplexing techniques have been developed that selectively excite a set of modes in few-mode fibres, such as phase plates [28][29][30] , spot launchers [31][32][33][34] and adiabatically tapered photonic lanterns [35][36][37] . In contrast to the bulky optics associated with phase plates, the latter two techniques potentially have the compactness necessary for integration into a future transponder.…”

Section: Experimental Implementationmentioning

confidence: 99%

Ultra-high-density spatial division multiplexing with a few-mode multicore fibre

et al. 2014

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Single-mode fibres with low loss and a large transmission bandwidth are a key enabler for long-haul high-speed optical communication and form the backbone of our information-driven society. However, we are on the verge of reaching the fundamental limit of single-mode fibre transmission capacity. Therefore, a new means to increase the transmission capacity of optical fibre is essential to avoid a capacity crunch. Here, by employing few-mode multicore fibre, compact three-dimensional waveguide multiplexers and energy-efficient frequency-domain multiple-input multiple-output equalization, we demonstrate the viability of spatial multiplexing to reach a data rate of 5.1 Tbit s −1 carrier −1 (net 4 Tbit s −1 carrier −1 ) on a single wavelength over a single fibre. Furthermore, by combining this approach with wavelength division multiplexing with 50 wavelength carriers on a dense 50 GHz grid, a gross transmission throughput of 255 Tbit s −1 (net 200 Tbit s −1 ) over a 1 km fibre link is achieved. W ith the persistent exponential growth in Internet-driven traffic, the backbone of our information-driven society, based on single-mode fibre (SMF) transmission, is rapidly approaching its fundamental capacity limits 1 . In the past, capacity increases in SMF transmission systems have been achieved by exploiting various dimensions, including polarization and wavelength division multiplexing, in tandem with advanced modulation formats and coherent transmission techniques 2 . However, the impending capacity crunch implies that carriers are lighting up dark fibres at an exponentially increasing rate to support societal capacity demands 3 . To alleviate the corresponding costs and increased energy requirements associated with the linear capacity scaling from using additional SMFs, spatial division multiplexing (SDM) within a single fibre can provide a solution 4,5 . By introducing an additional orthogonal multiplexing dimension, the capacity, spectral and energy efficiency, and therefore the cost per bit, can be decreased, which is vital for sustaining the business model of major network stakeholders. To fulfil the SDM promise, a new paradigm is envisaged that allows up to two orders of magnitude capacity increase with respect to SMFs 6 . SDM is achieved through multiple-input multiple-output (MIMO) transmission, employing the spatial modes of a multimode fibre (MMF) 7 , or multiple single-mode cores, as channels 8-13 . Recently, a distinct type of MMF, the few-mode fibre (FMF), has been developed to co-propagate three or six linear polarized (LP) modes 14-17 . Driven by rapid enhancements in high-speed electronics, digital signal processing (DSP) MIMO techniques can faithfully recover mixed transmission channels 18 , allowing spectral efficiency increases as spatial channels occupy the same wavelength. State-of-the-art single-carrier FMF transmission experiments have demonstrated capacity increases in a single fibre by exploiting six spatial modes, achieving 32 bit s −1 Hz −1 spectral efficiency 17 . By using multicore transmissi...

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Section: Experimental Implementationmentioning

confidence: 99%

Ultra-high-density spatial division multiplexing with a few-mode multicore fibre

et al. 2014

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“…Various types of mode multi/demultiplexer (MUX/DEMUX) and few-mode fiber have been proposed [9][10][11][12][13][14][15][16][17][18][19]. Of the proposed mode MUX/DEMUXs, the free-space optics based mode MUX/DEMUX encountered a difficulty in terms of reducing the insertion loss because a half-mirror was used for mode multi/demultiplexing [8,9].…”

Section: Introductionmentioning

confidence: 99%

Two-mode PLC-based mode multi/demultiplexer for mode and wavelength division multiplexed transmission

Hanzawa¹,

Saitoh²,

Sakamoto³

et al. 2013

Opt. Express

104

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Abstract:We proposed a PLC-based mode multi/demultiplexer (MUX/DEMUX) with an asymmetric parallel waveguide for mode division multiplexed (MDM) transmission. The mode MUX/DEMUX including a mode conversion function with an asymmetric parallel waveguide can be realized by matching the effective indices of the LP 01 and LP 11 modes of two waveguides. We report the design of a mode MUX/DEMUX that can support C-band WDM-MDM transmission. The fabricated mode MUX/DEMUX realized a low insertion loss of less than 1.3 dB and high a mode extinction ratio that exceeded 15 dB. We used the fabricated mode MUX/DEMUX to achieve a successful 2 mode x 4 wavelength x 10 Gbps transmission over a 9 km two-mode fiber with a penalty of less than 1 dB.

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“…Next the signals have to be multiplexed into a FMF or HC-PBGF supporting an equal or greater number of LP modes than the number of input signals. The multiplexing can be achieved in a number of ways: a phase-plate based mode multiplexer [10][11][12][13][17][18]; a photonic integrated mode-coupler [14,26]; a spot-launching multiplexer [15,27], 3D waveguide [9,16], or photonic lantern [28]. After mode-multiplexing and travelling through a length of fiber, amplification is obtained by employing a FM-EDFA [10,[29][30][31], in which modal gain control is important to avoid degradation of the signal due to mode-dependent loss.…”

Section: Methodsmentioning

confidence: 99%

Ultra-high Capacity Transmission with Few-mode Silica and Hollow-core Photonic Bandgap Fibers

Sleiffer

Leoni

Jung

et al. 2014

Optical Fiber Communication Conference

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Spot-Based Mode Couplers for Mode-Multiplexed Transmission in Few-Mode Fiber

Cited by 64 publications

References 10 publications

Ultra-high-density spatial division multiplexing with a few-mode multicore fibre

Ultra-high-density spatial division multiplexing with a few-mode multicore fibre

Two-mode PLC-based mode multi/demultiplexer for mode and wavelength division multiplexed transmission

Ultra-high Capacity Transmission with Few-mode Silica and Hollow-core Photonic Bandgap Fibers

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