Applications and Technical Issues of Wavelength-Division Multiplexing Passive Optical Networks With Colorless Optical Network Units [Invited]

Iwatsuki, K.; Kani, Jun‐ichi

doi:10.1364/jocn.1.000c17

Cited by 44 publications

(23 citation statements)

References 17 publications

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“…WDM-PON is a physically shared system, but a logically unshared system. This provides certain advantages as follows [2].…”

Section: Introductionmentioning

confidence: 99%

“…The cloud computing also provides information processing form a huge number of sensors with ubiquitous wireless sensor networks. Recent proposals establish to provide wireless and/or wired services over WDM-PON [2]- [5]. One of the most attractive approaches to easily and transparently transmitting RF signals over a wavelength is radio over fiber (RoF) techniques, so that various types of broadband wireless services in smaller radio cells can be flexibly and costeffectively accommodated with many base stations (BS) over WDM-PON [6].…”

Section: Introductionmentioning

confidence: 99%

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Optical coherent technologies in next generation access networks

Iwatsuki

Tsukamoto

2012

SPIE Proceedings

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This paper reviews optical coherent technologies in next generation access networks with the use of radio over fiber (RoF), which offer key enabling technologies of wired and wireless integrated and/or converged broadband access networks to accommodate rapidly widespread cloud computing services. We describe technical issues on conventional RoF based on subcarrier modulation (SCM) and their countermeasures. Two examples of RoF access networks with optical coherent technologies to solve the technical issues are introduced; a video distribution system with FM conversion and wired and wireless integrated wide-area access network with photonic up-and down-conversion.

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“…WDM-PON is a physically shared system, but a logically unshared system. This provides certain advantages as follows [2].…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Optical coherent technologies in next generation access networks

Iwatsuki

Tsukamoto

2012

SPIE Proceedings

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“…Experimental results demonstrate that the demodulation and wavelength conversion of 2.5-Gb/s DPSK signals are achieved. A power penalty of about 1.6 dB at a bit error rate of 10 −9 is measured after transmission over 25-km single mode fiber.OCIS [1,2] . These schemes include external light injection locking [3] , self-seeding [4] , and different formats of remodulation schemes [5,6] .…”

mentioning

confidence: 99%

“…OCIS [1,2] . These schemes include external light injection locking [3] , self-seeding [4] , and different formats of remodulation schemes [5,6] .…”

mentioning

confidence: 99%

“…Under existing technical conditions, cost remains the primary constraint to WDM-PON development. Various schemes for colorless optical network units (ONUs) have recently been proposed to realize cost-effective PON systems [1,2] . These schemes include external light injection locking [3] , self-seeding [4] , and different formats of remodulation schemes [5,6] .…”

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confidence: 99%

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Simultaneous DPSK demodulation and wavelength conversion scheme for Rayleigh backscattering noise mitigation in WDM-PON

Feng

Xiao

et al. 2013

中国光学快报

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We propose a scheme for mitigating Rayleigh backscattering noise and demodulating differential phaseshift keying (DPSK) signals in wavelength-division-multiplexed passive optical networks (WDM-PONs) with injection-locked Fabry-Perot laser diodes (FP-LDs). Signal demodulation and wavelength conversion are simultaneously realized on the basis of the frequency deviation and red shift of longitude modes in the FP-LDs. Experimental results demonstrate that the demodulation and wavelength conversion of 2.5-Gb/s DPSK signals are achieved. A power penalty of about 1.6 dB at a bit error rate of 10 −9 is measured after transmission over 25-km single mode fiber.OCIS [1,2] . These schemes include external light injection locking [3] , self-seeding [4] , and different formats of remodulation schemes [5,6] . According to present research, optical filter devices have the advantages of low cost, reliability, and manufacturability; such devices include semiconductor thin film filters [7] and computer-controlled fiber Bragg grating (FBG) [8] . In particular, these commercial devices may have very low temperature dependence, making them suitable for WDM-PON deployment. Many studies indicate that differential phase-shift keying (DPSK) signals exhibit higher receiver sensitivity and nonlinear tolerance than do traditional intensity modulation signals [9−11] ; however, a Mach-Zehnder delay interferometer (MZDI) must be deployed in each ONU, which further increases costs [12] . Interferometric crosstalk, including Rayleigh backscattering (RB) noise, can also severely degrade upstream performance when a single feeder fiber is deployed [13] . RB noise can be effectively avoided by a dual fiber transmission scheme [14] , but this scheme fails to satisfy the requirements for costeffectiveness.In this letter, we propose a DPSK demodulation and wavelength conversion scheme for WDM-PONs, in which a single commercial Fabry-Perot laser diode (FP-LD) with low-cost FBG is used. Upstream and downstream wavelengths are physically separated by wavelength conversion to mitigate reflection noise. The converted wavelength passes through a tunable optical filter (TOF) and is then split by an optical coupler. One split beam serves as the downstream receiving signal, and the other beam is launched into a reflective semiconductor optical amplifier (RSOA) as seeding light. We measure the bit error rate (BER) performance of 2.5-Gb/s downstream data with 1.25-Gb/s upstream data in single-fiber bidirectional transmission over 25-km single mode fiber (SMF). The proposed scheme effectively eliminates RB noise.As depicted in Fig. 1, the FP-LD originally self-seeds at wavelength λ * . When an external injection locking DPSK signal λ exists, the FP-LD is in a locked state at wavelength λ and the self-seeding condition at wavelength λ * is mismatched because of the red shift of cavity modes. The stable locking range of the FP-LD is only f 1 GHz. However, every phase shift in the DPSK signal produces a frequency deviation of f 2 GHz due to the sudden rise time of...

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