Time domain multiplexed spatial division multiplexing receiver

Uden, R.G.H. van; Okonkwo, Chigo; Chen, Haoshuo; Waardt, H. de; Koonen, Ton

doi:10.1364/oe.22.012668

Cited by 65 publications

(16 citation statements)

References 23 publications

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“…The PL outputs are connected to a TDM-SDM receiver (Fig. 5c) [22]. In this setup outputs corresponding to spatial channels 2, 3 and 4 are temporally separated using a fiber of 3, 6, and 9 km respectively, before being combined to a single output and thus allocating the 4 spatial channels into 4 different time slots.…”

Section: Receiver Sidementioning

confidence: 99%

10 Spatial mode transmission using low differential mode delay 6-LP fiber using all-fiber photonic lanterns

Weerdenburg¹,

Velázquez-Benítez²,

Uden³

et al. 2015

Opt. Express

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To unlock the cost benefits of space division multiplexing transmission systems, higher spatial multiplicity is required. Here, we investigate a potential route to increasing the number of spatial mode channels within a single core few-mode fiber. Key for longer transmission distances and low computational complexity is the fabrication of fibers with low differential mode group delays. As such in this work, we combine wavelength and mode-division multiplexed transmission over a 4.45 km low-DMGD 6-LP-mode fiber by employing low-loss all-fiber 10-port photonic lanterns to couple light in and out of the fiber. Hence, a minimum DMGD of 0.2 ns (maximum 0.357 ns) is measured after 4.45 km. Instrumental to the multi-mode transmission system is the employed time-domain-SDM receiver, allowing 10 spatial mode channels (over both polarizations) to be captured using only 3 coherent receivers and real-time oscilloscopes in comparison with 10 for conventional methods. The spatial channels were unraveled using 20 × 20 multiple-input multiple-output digital signal processing. By employing a novel round-robin encoding technique, stable performance over a long measurement period demonstrates the feasibility of 10x increase in single-core multi-mode transmission.

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Section: Receiver Sidementioning

confidence: 99%

10 Spatial mode transmission using low differential mode delay 6-LP fiber using all-fiber photonic lanterns

Weerdenburg¹,

Velázquez-Benítez²,

Uden³

et al. 2015

Opt. Express

Self Cite

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show abstract

“…The loss in the mode demultiplexer is approximately 4.5 dB for each output. After transmission, the three outputs from the mode demultiplexer are received using an elegant mode measurement technique was devised and detailed in [23]. In essence, two dual polarization coherent receivers are employed for the simultaneous reception of 3 transmitted modes.…”

Section: Receivermentioning

confidence: 99%

Advanced coding techniques for few mode transmission systems

Okonkwo¹,

Uden²,

Chen³

et al. 2015

Opt. Express

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Abstract:We experimentally verify the advantage of employing advanced coding schemes such as space-time coding and 4 dimensional modulation formats to enhance the transmission performance of a 3-mode transmission system. The performance gain of space-time block codes for extending the optical signal-to-noise ratio tolerance in multiple-input multiple-output optical coherent spatial division multiplexing transmission systems with respect to single-mode transmission performance are evaluated. By exploiting the spatial diversity that few-mode-fibers offer, with respect to single mode fiber back-to-back performance, significant OSNR gains of 3.2, 4.1, 4.9, and 6.8 dB at the hard-decision forward error correcting limit are demonstrated for DP-QPSK 8, 16 and 32 QAM, respectively. Furthermore, by employing 4D constellations, 6 × 28Gbaud 128 set partitioned quadrature amplitude modulation is shown to outperform conventional 8 QAM transmission performance, whilst carrying an additional 0.5 bit/symbol.

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“…Ten directional couplers (DCs) and subwavelength grating (SWG) structure based mode converters for TE 1 to TE 10 waveguide modes are employed as the mode multiplexer and demultiplexer for 11 TE-mode onchip transmission. A time division multiplexing (TDM) scheme [7], [8] is applied for MDM signal detection. We obtain bit-error rate (BER) error-free (< 7 × 10 −6 ) using quadrature phase shift keying (QPSK) and below 7% forward error correction (FEC) threshold using 16-QAM for all the modes over 7 wavelengths distributed from 1530 nm to 1560 nm.…”

Section: Introductionmentioning

confidence: 99%