• Title, Summary, Keyword: TWDM-PON

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New MAC Protocol and Dynamic Bandwidth Allocation Method for TWDM PON (TWDM PON을 위한 새로운 MAC 프로토콜 및 동적대역할당 방법)

  • Han, Man-Soo;Na, Cheol-Hun;Kang, Seong-Jun
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.17 no.6
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    • pp.1419-1424
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    • 2013
  • Passive optical networks (PONs) are the emerging solution for access networks since PONs provide high bandwidth and the low operation cost. In recent, the new solution in access networks is TWDM PON which is a mixture of WDM (wavelength-division multiplexing) and TDM (time-division multiplexing). This paper proposes a new MAC (media access control) protocol for TWDM PON. In addition, this paper proposes and evaluates a new dynamic bandwidth allocation method for TWDM PON.

Dynamic Bandwidth Allocation Algorithm of TWDM PON (TWDM PON의 동적대역할당 알고리즘)

  • Hong, Sung Hak;Han, Man Soo
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • pp.743-744
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    • 2013
  • This paper proposes a new DBA (dynamic bandwidth allocation) algorithm for a TWDM PON (time and wave-division multiplexing passive optical network) which is based on XGPON (10-Gigibit-Capable PON). Modifying a DBA algorithm of an XGPON, the proposed algorithm not only allocates the transmission slot but also assigns a wavelength to use for each ONU.

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New MAC Protocol for TWDM PON (TWDM PON을 위한 새로운 MAC 프로토콜)

  • Han, Man Soo;Na, Cheol Hun;Kang, Sung Jun
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • pp.741-742
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    • 2013
  • Passive optical networks (PONs) are the emerging solution for access networks since PONs provide high bandwidth. TDM ((time-division multiplexing) PON cannot support sufficient bandwidth for new broadband services such as UHD (ultra high-definition) IP TV, and VOD (video on demand). The solution is TWDM PON which is a mixture of WDM (wavelength-division multiplexing) and TDM. This paper proposes a new MAC (media access control) protocol for TWDM PON.

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Performance evaluation of unused bandwidth allocation methods for TWDM-PON (TWDM-PON의 잔여 대역폭 분배 방법의 성능평가)

  • Seo, Sang Jun;Han, Man Soo
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • pp.980-981
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    • 2013
  • This paper introduces a new allocation method of unused bandwidth for TWDM PON and explains the performance evaluation results. Using computer simulations, we compare the mean delay and the frame delay variance of the proposed method with those of the existing method.

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Performance Evaluation of DWBA for TWDM PON (TWDM PON의 동적파장 및 대역할당 알고리즘 성능평가)

  • Hong, Seong Hak;Han, Man Soo
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • pp.978-979
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    • 2013
  • This paper introduces a dynamic wavelength and bandwidth allocation method for TWDM PON and describes the performance evaluation results. Using computer simulations, we compare the frame delay variance and the frame loss rate of the introduced method with those of the existing method.

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Unused Bandwidth Allocation Method of TWDM PON (TWDM PON의 미사용 대역폭 분배 방법)

  • Hong, Sung Hark;Han, Man Soo
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • pp.745-746
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    • 2013
  • TWDM PON (time and wavelength division multiplexed passive optical network) uses multiple wavelengths to transmit packets upstream and downstream. In upstream transmission, if we use only one wavelength, the unused bandwidth is equally distributed to each ONU (optical network unit). In contrast, when multiple wavelengths are used, the unused remainders of wavelengths are different from each other. Therefore, it is difficult to fairly allocate the unused bandwidth to each ONU. This paper proposes a new method to allocate the unused bandwidth to each ONU in TWDM PON which uses multiple wavelengths.

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Performance Evaluation of Dynamic Bandwidth Allocation Algorithm of TWDM PON for Power Saving (TWDM PON의 전력절감용 동적대역할당 성능평가)

  • Hong, Sung Hark;Han, Man Soo
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • pp.150-151
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    • 2014
  • This paper evaluates performance of a dynamic wavelength and bandwidth allocation algorithm of TWDM PON (time and wavelength division multiplexed passive optical network) which consists of an OLT (optical line termination) and multiple ONU (optical network unit). The allocation algorithm reduces the number of upstream wavelengths to save power. Using self-similar traffic, we simulate TWDM PON systems and measure the average packet delay and the average number of upstream wavelengths.

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Dynamic Wavelength Allocation Algorithm of TWDM PON with Low-Speed Wavelength Tuner (저속 파장 변환기를 사용하는 TWDM PON의 동적파장할당 방법)

  • Han, Man Soo
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • pp.447-448
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    • 2015
  • This paper proposes a new dynamic wavelength allocation algorithm for TWDM PON (time and wavelength division multiplexed passive optical network) which comprises of multiple ONUs (optical network units) which have low-speed wavelength tuner. The wavelength tuner requires large amount of frame times to tune its wavelength. An OLT (optical line termination) performs a dynamic bandwidth allocation after the wavelengths of ONUs are determined.

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Dynamic Bandwidth Algorithm of TWDM PON for Power Saving (전력 절감형 TWDM PON의 동적대역할당 방법)

  • Hong, Sung Hark;Han, Man Soo
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • pp.699-700
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    • 2014
  • This paper proposes a new dynamic wavelength and bandwidth allocation algorithm for TWDM PON (time and wavelength division multiplexed passive optical network) which consists of an OLT (optical line termination) and multiple ONU (optical network unit). The proposed algorithm dynamically limits the number of the upstream wavelengths based on the request amount of ONUs to save power.

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Effects of Upstream Incoherent Crosstalk Caused by ASE Noise from Tx-Disabled ONUs in XG-PONs and TWDM-PONs

  • Lee, Han Hyub;Rhy, Hee Yeal;Lee, Sangsoo;Lee, Jong Hyun;Chung, Hwan Seok
    • ETRI Journal
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    • v.38 no.1
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    • pp.1-8
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    • 2016
  • A large incoherent crosstalk (IC) caused by amplified spontaneous emission (ASE) noise power from Tx-disabled optical network units and a differential path loss has been shown to degrade upstream transmission performance in time-division multiplexing passive optical networks. This paper considers the IC-induced power penalty of an upstream signal both in an XG-PON and in a TWDM-PON. We investigate the degradation of the extinction ratio and relative intensity noise through a simulation and experiments. For the XG-PON case, we observe a 9.6 dB difference in the level of ASE noise power from Tx-disabled ONUs (hereafter known simply as ASE noise) between our result and the ITU-T XG-PON PMD recommendation. We propose an optical filtering method to mitigate an IC-induced power penalty. In the TWDM-PON case, the IC-induced power penalty is naturally negligible because the ASE noise is filtered by a wavelength multiplexer at the optical line terminal. The results provide design guidelines for the level of ASE noise in both XG-PONs and TWDM-PONs.