Impact of backreflection on upstream transmission in WDM single-fiber loopback access networks

Fujiwara, M.; Kani, Jun‐ichi; Suzuki, H.; Iwatsuki, K.

doi:10.1109/jlt.2005.862429

Cited by 112 publications

(53 citation statements)

References 8 publications

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“…However, the link is vulnerable to parasitic reflections caused either by bad fiber connections or by Rayleigh reflection in the optical fiber. This reflected signal induces beat noise against the intended signal at the receiver [25]. Figure 15(a) shows the test setup for characterizing the effect of reflection on transmission quality.…”

Section: Reflection Sensitivity In the Re-modulation Schemesmentioning

confidence: 99%

“…Figure 15(b) shows the setup for emulating reflection on the link. The magnitude of link reflection is able to be controlled with the variable attenuator, whereas polarization states of the reflected light being controlled with the polarization controller [25]. In the figure, R1 is the reflection of the downstream optical signal toward the OLT side, and R2 is the reflection of the upstream signal toward the ONU side.…”

Section: Reflection Sensitivity In the Re-modulation Schemesmentioning

confidence: 99%

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RSOA-Based Wavelength-Reuse Gigabit WDM-PON

Kim

2008

Journal of the Optical Society of Korea

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This article presents the RSOA-based re-modulation schemes for practical application to the WDM-PON link. Emphasis is put on the three methods for reducing the residual downstream signal in the upstream transmission; the simplest one is to use the RSOA gain-saturation property, the second uses selective filtering of the adiabatic-chirped DFB-LD output spectrum, and the last uses a dynamic RSOA gain control by varying its driving current according to the incident binary signal. The reflection sensitivity in the proposed re-modulation link is also qualitatively presented in the cases of using two different types of seed light: coherent light from DFB-LD array and spectrum-sliced incoherent ASE light. We show experimental results of an error-free bidirectional gigabit transmission over 20 km at -30 dB reflection with the spectrum-sliced ASE seed light.

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Section: Reflection Sensitivity In the Re-modulation Schemesmentioning

confidence: 99%

Section: Reflection Sensitivity In the Re-modulation Schemesmentioning

confidence: 99%

RSOA-Based Wavelength-Reuse Gigabit WDM-PON

Kim

2008

Journal of the Optical Society of Korea

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“…Carrier is constant about -34dB, depending the fiber coefficient [5]. Reflections interference happened if there is a discontinuity in the link of transmission system.…”

Section: Rbmentioning

confidence: 99%

Backscattering Interferences in WDM Optical Transmission System

Xie¹

2013

IJCA

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“…If we apply the same procedure as for in (4)-(11) to the signal given by the above formula, we obtain an expression for the interferometric noise component of the photocurrent (19) If a sine-shape signal is applied to modulate the phase at the source, the expression describing phase deviation at the phase modulator is given as follows: where is the modulation index and is the frequency of the phase modulating signal. When the above is taken into account together with the assumption that the phase changes induced in the RSOA are negligible with respect to the external phase modulation, we can modify the (19) to the following: (21) Applying the same condition as in (16) to the phase deviation induced by the phase modulator gives the formula below (22) The result after solving (22) shows the relation of modulation index to the frequency of phase modulating signal, Fig. 6 (RSOA ).…”

Section: Coherent Crosstalk and External Phase Modulationmentioning

confidence: 99%

Interferometric Crosstalk Reduction in an RSOA-Based WDM Passive Optical Network

Urban

Koonen

Khoe

et al. 2009

J. Lightwave Technol.

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Abstract-Reflection and Rayleigh backscattering-induced interferometric crosstalk in a link employing a reflective semiconductor optical amplifier (RSOA) may cause significant power penalty and, thus, limit the performance of the system. In this paper, we investigate interferometric crosstalk suppression in a centralized light generation wavelength division multiplexing-passive optical network (WDM-PON) by single-tone phase modulation either by utilizing the nonlinear behavior of the RSOA at the optical network unit (ONU) or by applying an external phase modulator at the source side. 6-and 7-dB reduction in power penalty for reflection-induced crosstalk is achieved, respectively. For Rayleigh backscattering-induced crosstalk power penalty is improved with 3 and 4.5 dB, respectively. The results show that an RSOA is very sensitive to reflections and backscattering and the tolerance to these impairments can be significantly improved by appropriate phase modulation. A comparison with advantages and disadvantages of both methods together with final recommendation is also given in the paper.Index Terms-Backreflection, bidirectional transmission, interferometric noise, optical crosstalk, passive optical networks, Rayleigh backscattering, reflective semiconductor optical amplifier (RSOA), wavelength division multiplexing.

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Impact of backreflection on upstream transmission in WDM single-fiber loopback access networks

Cited by 112 publications

References 8 publications

RSOA-Based Wavelength-Reuse Gigabit WDM-PON

RSOA-Based Wavelength-Reuse Gigabit WDM-PON

Backscattering Interferences in WDM Optical Transmission System

Interferometric Crosstalk Reduction in an RSOA-Based WDM Passive Optical Network

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