• Title/Summary/Keyword: wavelength division multiplexed-passive optical network (WDM-PON)

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A multistage wavelength division multiplexed passive optical network (다단 분기 파장분할 다중방식 수동형 광가입자망)

  • Park, Kun-Youl;Park, Jae-Hyoung;Kim, Geun-Young;Kim, Jin-Hee
    • 한국정보통신설비학회:학술대회논문집
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    • 2008.08a
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    • pp.112-115
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    • 2008
  • The multistage wavelength division multiplexed passive optical network (WDM-PON) with multiple remote nodes (RN) can accommodate widely spread subscribers efficiently and it increases the channel usage. We implemented a multistage RN using band add-drop filters and it was applied to a wavelength-locked Fabry-Petor laser diode based gigabit WDM-PON.

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Noise Suppression of Spectrum-Sliced WDM-PON Light Sources Using FP-LD

  • Lee, Woo-Ram;Cho, Seung-Hyun;Park, Jae-Dong;Kim, Bong-Kyu;Kim, Byoung-Whi
    • ETRI Journal
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    • v.27 no.3
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    • pp.334-336
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    • 2005
  • We improved the performance of the spectrum-sliced light source for wavelength-division-multiplexed passive optical networks by employing a Fabry-Perot laser diode(FP-LD). We found that the FP-LDs can suppress the intensity noise as significantly as using a gain-saturated semiconductor optical amplifier. The transmission characteristics were measured and analyzed in both conditions with and without employing an FP-LD.

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A Low Noise Broadband Light Source and its Application on WDM-PON (저잡음 특성의 광대역 비간섭성 광원과 파장 분할 다중방식 수동형 광가입자망에의 응용)

  • Choi Ki-Man;Moon Jung-Hyung;Lee Chang-Hee
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.43 no.5 s.347
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    • pp.68-76
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    • 2006
  • We propose a low noise broadband light source (BLS) and investigate a cost-effective wavelength division multiplexing-passive optical network (WDM-PON) for the convergence of broadcasting and data service. The proposed BLS is used for an injection light of wavelength-locked Fabry-Perot laser diodes (F-P LD) and helps the color-free operation of dense WDM-PON (DWDM-PON). In addition, we apply this BLS to a optical source for overlay of digital broadcasting channel on the WDM-PON.

An Amplified WDM-PON Using Broadband Light Source Seeded Optical Sources and a Novel Bidirectional Reach Extender

  • Kang, Byoung-Wook;Kim, Chul-Han
    • Journal of the Optical Society of Korea
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    • v.15 no.3
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    • pp.222-226
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    • 2011
  • We demonstrated the feasibility of an amplified wavelength-division multiplexed passive optical network (WDM-PON) architecture based on broadband light source (BLS) seeded optical sources and a novel bidirectional reach extender. Our bidirectional reach extender could provide an amplification of both downstream and upstream signals as well as a BLS output for the upstream WDM signal generation. An error-free 1.25 Gb/s signal transmission over a 100-km long single-mode fiber was achieved in a bidirectional WDM-PON using BLS seeded reflective semiconductor optical amplifier (RSOA) sources.

Ultra-Dense WDM PON with 12.5-GHz Spaced 256 Channels

  • Yim, Jae-Nam;Hwang, Gyo-Sun;Lee, Jae-Seung;Seo, Kyung-Hee;Lee, Hyun-Jae;Ko, Je-Soo
    • Journal of the Optical Society of Korea
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    • v.12 no.4
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    • pp.351-354
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    • 2008
  • We demonstrate an ultra-dense wavelength-division- multiplexed (UD-WDM) passive optical network (PON) where 12.5-GHz spaced 1 GbE ${\times}$ 256 optical channels are distributed using 12.5- and 200-GHz arrayed waveguide gratings in series. For the generation of upstream signals, we use reflective semiconductor optical amplifiers. We use two optical fiber amplifiers at the optical line terminal to amplify downstream and upstream channels.

Effects of Upstream Bit Rate on a Wavelength-Remodulated WDM-PON Based on Manchester or Inverse-Return-to-Zero Coding

  • Chung, Hwan-Seok;Kim, Bong-Kyu;Kim, Kwang-Joon
    • ETRI Journal
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    • v.30 no.2
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    • pp.255-260
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    • 2008
  • We compare the performance of a wavelength remodulated wavelength-division-multiplexed passive optical network implemented using Manchester-coded or inverse-return-to-zero (IRZ)-coded signal downstream and non-return-to-zero remodulated signal upstream. We investigate the effects of varying differences between downstream and upstream bit rates on the two coding schemes. When the bit rate ratio of upstream to downstream is less than or equal to 50%, the performance of Manchester coding is better than that of IRZ coding. However, when the bit rate ratio of upstream to downstream is higher than 50%, Manchester code requires appropriate time delay between upstream and downstream signals, whereas IRZ code needs reduced extinction ratio in the downstream signal.

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Efficient Power-Saving 10-Gb/s ONU Using Uplink Usage-Dependent Sleep Mode Control Algorithm in WDM-PON

  • Lee, Han Hyub;Kim, Kwangok;Lee, Jonghyun;Lee, Sangsoo
    • ETRI Journal
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    • v.35 no.2
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    • pp.253-258
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    • 2013
  • We propose and demonstrate an efficient power-saving optical network unit (ONU) based on upstream traffic monitoring for 10-Gb/s wavelength division multiplexed passive optical networks (WDM-PONs). The power-saving mode controller uses a ${\mu}$-processor and traffic monitoring modules followed by the proposed power-saving processes to operate the sleep mode ONU. The power consumption of the ONU is effectively reduced from 19.3 W to 6.4 W when no traffic from the users is detected. In addition, we design a power-saving mechanism based on a cyclic sleep mode operation to allow a connectivity check between the optical line terminal and ONU. Our calculation results show that the WDM-PON ONU reduces the power consumption by around 60% using the proposed mechanism.

Colorless Amplified WDM-PON Employing Broadband Light Source Seeded Optical Sources and Channel-by-Channel Dispersion Compensators for >100 km Reach

  • Kang, Byoung-Wook;Lee, Kwanil;Lee, Sang Bae;Kim, Chul Han
    • Journal of the Optical Society of Korea
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    • v.18 no.5
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    • pp.436-441
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    • 2014
  • We have demonstrated an amplified wavelength-division multiplexed (WDM) passive optical network (PON) by using broadband light source (BLS) seeded optical sources and chirped fiber Bragg gratings (FBGs) based dispersion compensators. Chirped FBGs located at central office (CO) were fabricated and used as channel-by-channel dispersion compensators in order to mitigate the dispersion-induced distortion of both downstream and upstream signals. Owing to a low insertion loss of chirped FBG based dispersion compensator, the optical signal-to-noise ratio (OSNR) of the downstream signal could be improved to be ~28 dB. Thus, we re-confirmed that an error-free transmission of 1.25 Gb/s signals over a 100 km single-mode fiber (SMF) link could be achieved with a proposed amplified WDM-PON architecture. We have also evaluated the impact of various noises on the system's performance, and found that the low OSNR of the downstream signal would be a main limiting factor on the maximum reach of the proposed amplified WDM-PON architecture. From the measured ~13 dB improvement in OSNR of the downstream signal compared to our previously-proposed dispersion compensating module based scheme, we believe that the proposed architecture can accommodate a reach of longer than 100 km SMF link easily.

Bidirectional 1.25-Gbps WDM-PON with Broadcasting Function Using A Fabry-Perot Laser Diode and RSOA

  • Pham, Thang T.;Kim, Hyun-Seung;Won, Yong-Yuk;Han, Sang-Kook
    • Journal of the Optical Society of Korea
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    • v.12 no.4
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    • pp.359-363
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    • 2008
  • A novel WDM-PON system delivering bidirectional 1.25-Gbps data and broadcasting data is proposed. A subcarrier signal modulates optical carriers of a Fabry-Perot-laser-diode based broadband light source to broadcast to all users. Reflective semiconductor optical amplifiers are used as modulators for the baseband data at both the optical line terminal and the remote optical network unit for a channel. Bit error rate and error vector magnitude were measured to demonstrate the proposed scheme.