Low Complexity FDM/FDMA Approach for Future PON

Lebreton, Aurelien; Charbonnier, B.; Farias, Giovanni B. de; Chanclou, P.; Menezo, Sylvie

doi:10.1364/ofc.2013.oth3a.7

Cited by 9 publications

(8 citation statements)

References 6 publications

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Section: Introductionmentioning

confidence: 99%

“…Hence, even if only a small part of it is effectively employed by the ONU, the full bandwidth (BW) has to be processed. As a low complexity alternative for the ONUs in a PON, multi-band OFDM has been proposed [5].In this paper we demonstrate a multi-band BW distribution upstream in statistical OFDM for the first time to the best of our knowledge and compare it with digital subcarrier allocation scheme. The digital processing in the ONUs is reduced by decreasing the FFT size and setting the contributions into non-overlapping orthogonal frequency bands by means of a radio frequency (RF) mixer.…”

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confidence: 99%

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Experimental Demonstration of Multi-band Upstream in Statistical OFDM-PONs and Comparison with Digital Subcarrier Assignment

Cano

Escayola

Schindler

et al. 2014

Optical Fiber Communication Conference

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A multiband subcarrier allocation scheme is demonstrated for the uplink in a statistical OFDM-PON. Performance achieved is similar to digital subcarrier allocation, with the significant advantage of a lower transmitter complexity. OCIS codes: (060.0060) Fiber optics and optical communication; (060.2330) Fiber optics communications IntroductionOrthogonal frequency division multiplexing (OFDM) has attracted attention for passive optical networks (PON) in the past years [1,2]. Though several studies have been carried out in the downstream, there are few works related with the upstream OFDM multipoint-to-point. In [3] an uplink with 4 optical network units (ONUs) and central distribution optical carrier with coherent detection was demonstrated while in [4] ONUs with independently tuned DFB lasers with direct-detection at the optical line terminal (OLT) were evaluated. In previous works, digital subcarrier allocation scheme was used, in which each ONU places its data symbols into assigned subcarriers while setting to zero the rest in the OFDM frame. This method assumes that the ONUs and the OLT have the same FFT size. Hence, even if only a small part of it is effectively employed by the ONU, the full bandwidth (BW) has to be processed. As a low complexity alternative for the ONUs in a PON, multi-band OFDM has been proposed [5].In this paper we demonstrate a multi-band BW distribution upstream in statistical OFDM for the first time to the best of our knowledge and compare it with digital subcarrier allocation scheme. The digital processing in the ONUs is reduced by decreasing the FFT size and setting the contributions into non-overlapping orthogonal frequency bands by means of a radio frequency (RF) mixer. Proper simultaneous detection of both ONUs in the OLT with a higher order FFT is achieved with performance values in line with those measured with digital subcarrier allocation. In addition, different BW assignments and modulation formats are evaluated. The results show the feasibility of multiband OFDM for upstream while allowing a flexible adaptation of the system according to the user needs.

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Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

Experimental Demonstration of Multi-band Upstream in Statistical OFDM-PONs and Comparison with Digital Subcarrier Assignment

Cano

Escayola

Schindler

et al. 2014

Optical Fiber Communication Conference

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“…3 However, the complexity of the transmission systems, the need for massive digital-signal processing, and the non-idealities that arise during operation could limit the realistic exploitation of these methods in short-reach networks. 4,5 In our work, 6,7 we propose a different multicarrier approach, based on frequency division multiplexing (FDM). Our technique retains the advantages of multicarrier modulation, but reduces non-idealities and transmission-system complexity by limiting the number of sub-carriers.…”

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confidence: 99%

Multicarrier approach increases the capacity of optical systems

Gatto¹,

Argenio²,

Boffi³

2017

SPIE Newsroom

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The modulation and allocation of optimized multiplexed subcarriers in short-range data networks, based on a directly modulated bandwidthlimited optical source, enables the transfer of 25Gb/s over 20km of fiber.Multicarrier modulation is a technique for increasing the amount of information that can be transported by a communication system (i.e., the capacity). The approach is based on splitting a high-bit-rate signal into hundreds of orthogonal sub-carriers, each with a very low symbol rate. The exploitation of this technique in short-range data networks can hugely increase the throughput of a single optical link, thereby removing the need for high-complexity and high-performance components. 1 Future low-cost, energy-efficient datacenters and access networks that employ this modulation technique could therefore operate at very high bit rates by using cost-effective and bandwidthlimited optical sources.For short-range data network scenarios, as well as for longand medium-range networks, optical communications represent the most promising solution for both professional and consumer applications. Compared with optical transport networks, however, short-reach networks are much more sensitive to cost, footprint, and power consumption. For these reasons, such networks require the use of cost-effective and energy-efficient optical sources-such as vertical-cavity surface-emitting lasers (VCSELs)-combined with direct intensity modulation (IM) and direct detection (DD). 2 In the near future, however, these requirements could be met by using standard and low-cost devices with limited electrooptical (E/O) bandwidths. Key to achieving this is a drastic increase in the spectral efficiency of the transmitted signal from the current standard (i.e., 0.5bit/s/Hz, achieved with on-off-keying transmission). Two different modulation methods-i.e., orthogonal frequency division multiplexing and discrete multitone modulation-have recently been proposed as a way to enhance the transported capacity. Both approaches enable modulated data to be carried on several parallel channels. 3 However, the complexity of the transmission Figure 1. Measured and theoretical fiber transfer functions after propagation through 10 and 20km of standard single-mode fiber (SSMF).systems, the need for massive digital-signal processing, and the non-idealities that arise during operation could limit the realistic exploitation of these methods in short-reach networks. 4,5 In our work, 6, 7 we propose a different multicarrier approach, based on frequency division multiplexing (FDM). Our technique retains the advantages of multicarrier modulation, but reduces non-idealities and transmission-system complexity by limiting the number of sub-carriers. We used a long-wavelength VCSEL, characterized by a very limited bandwidth (of around 5GHz), to highlight the huge enhancement to the capacity of transported information that our technique enables.Of all channel distortion types, we hoped particularly to mitigate chromatic dispersion. This type of distortion causes each spe...

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“…The measured efficiency of the phase tuner is ~0.056./mW (~18mW are required for a  phase shift). From Equation 1, simulations can be driven in order to assess the trade-offs of the device [10] [11]. Maximizing the demodulated signal reflected back from the R-MZM requires to null the counter modulation efficiency .…”

mentioning

confidence: 99%

“…is evaluated by computing the phase mismatch between the optical and RF waves along the MZM arm length [10] [11]. As described in [11], at low RF frequencies ( <2GHz), the counter-propagating modulation efficiency stays high and equal to the co-propagating efficiency (~). This is because the RF wavelength is several 10 times longer than Lel).…”

mentioning

confidence: 99%

Transmitter Made up of a Silicon Photonic IC and its Flip-Chipped CMOS IC Driver Targeting Implementation in FDMA-PON

Menezo

Temporiti

Lee³

et al. 2016

J. Lightwave Technol.

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We report on the design, fabrication and characterization of a reflective transmitter targeting implementation in Passive Optical Networks (PON) with Frequency Division Multiplexed Access (FDMA). It is made up of a Silicon Photonic Integrated Circuit (Si-PIC) comprising a Reflective Mach Zehnder Modulator (R-MZM) and its flip chipped CMOS Electronic Integrated Circuit (EIC) driver, the two ICs being interconnected by means of high density and low parasitic copper micro pillars. Several transmissions, in an FDMA PON context, are successfully demonstrated using 500MBaud QPSK and 16-QAM modulated subcarriers, achieving Bit Error Rate (BER) below 2.10-3. For QPSK-modulated subcarriers (respectively 16-QAM), the available access frequency bandwidth is measured to be [1-7GHz] (respectively [2-4GHz]) with an available loss budget of 9dB (respectively 5dB). Improvements of the Si-PIC are further identified to achieve compliancy with 31dB ODN loss.

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Low Complexity FDM/FDMA Approach for Future PON

Cited by 9 publications

References 6 publications

Experimental Demonstration of Multi-band Upstream in Statistical OFDM-PONs and Comparison with Digital Subcarrier Assignment

Experimental Demonstration of Multi-band Upstream in Statistical OFDM-PONs and Comparison with Digital Subcarrier Assignment

Multicarrier approach increases the capacity of optical systems

Transmitter Made up of a Silicon Photonic IC and its Flip-Chipped CMOS IC Driver Targeting Implementation in FDMA-PON

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