Signal-Induced Rayleigh Noise Reduction using Gain Saturation in an Integrated R-EAM-SOA

MacHale, E. K.; Talli, Giuseppe; Townsend, Paul D.; Borghesani, A.; Lealman, I.F.; Moodie, D.G.; Smith, Denise M.

doi:10.1364/ofc.2009.otha6

Cited by 10 publications

(7 citation statements)

References 4 publications

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“…Up to now, analysis of signal squeezing, under dynamic conditions, has relied upon the well-known single-pass SOA behavior [5]. Signal squeezing experiments using RSOAs for frequency-swept sinusoidal signals [2] and optical noise [6] show strong reduction at low frequencies. The origin of strong squeezing cannot be explained from SOA theory alone.…”

Section: Introductionmentioning

confidence: 99%

Efficient modulation cancellation usingreflective SOAs

Dúill¹,

Marazzi²,

Parolari³

et al. 2012

Opt. Express

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Modulation cancellation and signal inversion are demonstrated within reflective semiconductor optical amplifiers. The effect is necessary to implement colorless optical network units for network end-users, where downstream signals need to be erased in order to reuse the carrier for upstream transmission. The results presented here indicate that reflective semiconductor optical amplifiers possess the perfect high-speed all-optical gain saturation characteristics to completely cancel the downstream modulation at microwatt optical power levels and are thus the prime candidate to be constituents of future optical network units. Theoretical considerations are supported by experiments that show the cancellation of signals with a 6 dB extinction ratio at 2.5 Gbit/s.

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Section: Introductionmentioning

confidence: 99%

Efficient modulation cancellation usingreflective SOAs

Dúill¹,

Marazzi²,

Parolari³

et al. 2012

Opt. Express

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“…However, its importance goes significantly further: because of the presence of a RBS [11] crosstalk component that is much stronger than the useful signal, a direct-detection receiver would simply not work, owing to the beating accompanying a CW signal. Many research groups have addressed the topic of reducing the effect of RBS in direct-detection receivers by using different optical or electrical techniques, but, to the best of our knowledge, none can function with an optical signal to Rayleigh noise ratio (OSNRN) lower than 5-6 dB [13], while here the OSNRN target was in the negative range, such as the previously discussed −25 dB OSNRN value. The self-coherent receiver is key here, since it provides access in the electrical domain to an exact replica of the received optical field (and not just its instantaneous power, as in direct detection) such that there is no beating between the signal and the RBS, but the two signals simply appear as added, both at the field level and in the equivalent electrical components after coherent detection.…”

Section: Discussion On Experimental Results and System Optimization Imentioning

confidence: 95%

Optimization of self-coherent reflective PON to achieve a new record 42 dB ODN power budget after 100 km at 125 Gbps

Straullu¹,

Forghieri²,

Ferrero³

et al. 2012

Opt. Express

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We demonstrate a greater than 42 dB optical distribution network power budget in the upstream of a 1.25 Gbps self-coherent reflective PON after 100 km of installed fibers, using off-the-shelf optoelectronic components, improving our previous result by 4 dB. We discuss all system optimizations introduced in the setup in order to reach such a result, including 8B/10B high-pass filtering and Faraday rotation at the ONU.

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“…Gain values smaller than 10 dB are not recommendable because of the receiver noise. For the input powers received at the RSOA ( dBm), no significant gain saturation of the RSOA is observed that could potentially reduce the crosstalk [7], [4].…”

Section: Experimental Measures and Resultsmentioning

confidence: 99%

“…The aim of this work is to analyze the penalties in the upstream and downstream paths due to RB signals, extending our preliminary study [3], establishing the most adequate location of the multiplexer (MUX) in wavelength-division-multiplexing (WDM)-PONs, and the optimum ONU gain. Other effects, like the RB gain saturation [4] and the variation of the bandwidth of the receiver and the optical filter [5], are not considered here. An extension to time-division-multiplexing (TDM)-PON is under investigation and first results can be found in [6].…”

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confidence: 99%

Optimization of Rayleigh-Limited WDM-PONs With Reflective ONU by MUX Positioning and Optimal ONU Gain

Lopez

Lazaro

Arellano

et al. 2010

IEEE Photon. Technol. Lett.

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Abstract-In this work, the influence of the distribution element position and the reflective optical network unit (ONU) gain in wavelength-division-multiplexing passive optical networks are reported. After the theoretical and experimental analysis, it is determined that the best crosstalk-to-signal ratio is achieved if the multiplexer is placed either in the ONU or optical light termination vicinity, and the ONU gain has a new optimum value depending on the position. Also, it is demonstrated that Rayleigh backscattering is generally irrelevant in downstream transmission.Index Terms-Access networks, optical fiber communication, passive optical networks (PONs), Rayleigh scattering, wavelength-division multiplexing (WDM).

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Signal-Induced Rayleigh Noise Reduction using Gain Saturation in an Integrated R-EAM-SOA

Cited by 10 publications

References 4 publications

Efficient modulation cancellation usingreflective SOAs

Efficient modulation cancellation usingreflective SOAs

Optimization of self-coherent reflective PON to achieve a new record 42 dB ODN power budget after 100 km at 125 Gbps

Optimization of Rayleigh-Limited WDM-PONs With Reflective ONU by MUX Positioning and Optimal ONU Gain

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