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ABSTRACT: We demonstrate an improvement of optical receiver performance for an optical signal with beat noises. The decision threshold level is adjusted automatically according to the detected average optical power. This simple method improves optical receiver performance under a wide range of input signal conditions, e.g., beat noise level and extinction ratio. Thus this proposed method is useful to optical receivers for WDM-PONs. By employing this control circuit, we successfully demonstrate a WDM-PON based on a wavelength-locked Fabry–Perot laser diode at 1.25 Gb/s per channel with 100 GHz spacing.
Journal of Optical Communications and Networking 07/2010; · 1.87 Impact Factor
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ABSTRACT: We propose and demonstrate a seamless evolution method with protection capability for next-generation (NG) access networks. Both a time-division-multiplexing passive optical network (TDM-PON) and a wavelength-division-multiplexing (WDM-PON) can be accommodated in the same fiber infrastructure and failures of feeder fibers and distribution fibers are protected for each service. Remote reconfigurations of the remote node (RN) for protection and/or evolution can be achieved within 48 ms by instantaneous optical powering at the central office (CO) while maintaining the RN in a passive state.
Journal of Lightwave Technology 11/2009; · 2.78 Impact Factor
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ABSTRACT: We propose and demonstrate a seamless maintenance and protection scheme based on remotely reconfigurable remote node. Protection for fiber failures and a centralized optical time-domain reflectometry test for preventive maintenance can be achieved within 90 ms by using instantaneous optical powering at the central office, while maintaining the passive nature of the passive optical network.
IEEE Photonics Technology Letters 07/2009; · 2.19 Impact Factor
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ABSTRACT: We propose and demonstrate a PON architecture that can be remotely reconfigurable for monitoring and protection from fiber failure/degradation. Protection for fiber failures and OTDR test for preventive maintenance can be done without service disruptions.
Optical Fiber Communication - incudes post deadline papers, 2009. OFC 2009. Conference on; 04/2009
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ABSTRACT: We propose a novel automatic wavelength control method of a tunable laser for a wavelength-division-multiplexed passive optical network (WDM-PON). By sending a low-power amplified spontaneous emission light generated from a broadband light source (BLS) to a tunable laser through a wavelength-division multiplexer, we match the wavelength of the tunable laser to a peak transmission wavelength of the multiplexer. The deviation of the wavelength of the tunable laser was less than 0.05 nm from the center of the target channel. We demonstrate up to 10-Gb/s transmission in a WDM-PON by using the proposed method. We also show that system impairments induced by the BLS are negligible.
IEEE Photonics Technology Letters 04/2009; · 2.19 Impact Factor
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ABSTRACT: We demonstrated improved performance of a low-noise broadband light source (BLS) based on mutually injected Fabry-Perot laser diodes for a large capacity and high bit-rate wavelength-division-multiplexed passive optical network (WDM-PON). The 3-dB linewidth and relative intensity noise of each mode of the low-noise BLS are improved by radio-frequency modulation, where the frequency was detuned from the fundamental noise peak of the low-noise BLS. Then, a 622-Mb/s WDM-PON was demonstrated. Furthermore, a 1-Gb/s WDM-PON can be realized with Manchester coding at a channel spacing of 100 GHz. Thus, the proposed low-noise BLS can be employed to realize a highly scalable WDM-PON.
IEEE Photonics Technology Letters 01/2009; · 2.19 Impact Factor
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ABSTRACT: We demonstrated a WDM-PON based on low noise BLS using mutually injected F-P LDs. The low noise BLS is more useful to realize highly scalable WDM-PON based on the wavelength-locked F-P LDs than ASE-based BLS.
Optical Internet, 2008. COIN 2008. 7th International Conference on; 11/2008
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ABSTRACT: We propose a novel automatic wavelength control method for a tunable laser for wavelength division multiplexed-passive optical networks by using a low power broadband light source.
Optical Communication, 2008. ECOC 2008. 34th European Conference on; 10/2008
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ABSTRACT: We demonstrate the performance enhanced low-noise BLS for a large capacity and high bit-rate WDM-PON. The 3 dB linewidth and RIN of one mode from the low-noise BLS is improved by a RF modulation.
Opto-Electronics and Communications Conference, 2008 and the 2008 Australian Conference on Optical Fibre Technology. OECC/ACOFT 2008. Joint conference of the; 08/2008
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ABSTRACT: We propose and demonstrate a simple decision threshold control circuit. By employing this method, we demonstrate a feasibility of WDM-PON at 1.25 Gb/s per channel with 100 GHz spacing based on the wavelength-locked F-P LDs.
Opto-Electronics and Communications Conference, 2008 and the 2008 Australian Conference on Optical Fibre Technology. OECC/ACOFT 2008. Joint conference of the; 08/2008
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ABSTRACT: Efficient evolution methods maintaining exisiting legacy PON services and fiber infrastructure are discussed for next-generation access networks. A user-by-user evolution from legacy PONs to NG-PONs and reuse of video-overlay wavelength band for NGPON are demonstrated with remotely reconfigurable remote nodes.
Opto-Electronics and Communications Conference, 2008 and the 2008 Australian Conference on Optical Fibre Technology. OECC/ACOFT 2008. Joint conference of the; 08/2008
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ABSTRACT: A remotely reconfigurable remote node (RN) for next-generation (NG) access networks is proposed and demonstrated. The RN is remotely reconfigured by instantaneous optical powering at the central office through feeder fiber and maintained in a passive state by employing optical latching switches (OLSs). The feasibility of the proposed RN is demonstrated by investigating the operating conditions of optical powering for the reconfiguration and its nonlinear effect both for time-division-multiplexing passive optical network (TDM-PON) as legacy services and wavelength-division-multiplexing passive optical network (WDM-PON) as NG services. The existence of OLSs for reconfigurability and crosstalk effect between TDM-PON and WDM-PON are negligible on transmission performance.
IEEE Photonics Technology Letters 07/2008; · 2.19 Impact Factor
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ABSTRACT: An evolution method from a TDM-PON with a video overlay to NGA is demonstrated. A single type of 374-port WC enables a simple evolution of TDM-PON with a video overlay maintaining OSP and wavelength plan.
Optical Fiber communication/National Fiber Optic Engineers Conference, 2008. OFC/NFOEC 2008. Conference on; 03/2008
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ABSTRACT: We propose an evolution method from a time-division-multiplexing passive optical network (TDM-PON) with a video overlay to a wavelength-division-multiplexing (WDM)-PON as a next-generation access network. In order to establish a smooth evolution path, a single type of three-port wavelength band combiner/splitter (WC) was used at the remote node and optical network terminations. At the central office, a four-port WC was used to combine the TDM-PON, the video overlay, and the WDM-PON. Crosstalk among those signals is negligibly small.
IEEE Photonics Technology Letters 03/2008; · 2.19 Impact Factor
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ABSTRACT: We investigate the effects of back-reflection in wavelength-division-multiplexing passive optical networks having an injected seed light for color-free operation of an optical network unit. The back-reflection-induced penalty is reduced as the linewidth of the seed light is increased. The wavelength-locked Fabry-Perot laser diode to an injected spectrum-sliced amplified spontaneous emission light shows a high robustness on the back-reflections, while a coherent seed light exhibits a high-reflection-induced penalty. We also estimate the maximum allowable fiber loss according to the linewidth of the seed light.
IEEE Photonics Technology Letters 01/2008; · 2.19 Impact Factor
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ABSTRACT: We propose and demonstrate a wavelength-division-multiplexed passive optical network by employing double-contact Fabry-Perot laser diodes (F-P LDs) without a seed light injection. To avoid the high mode partition noise at low frequency, we use a binary phase-shift keying as a modulation format at a low relative intensity noise window. An error-free transmission is achieved by compensating a lasing envelope shift due to temperature variation with the double-contact F-P LD.
IEEE Photonics Technology Letters 12/2007; · 2.19 Impact Factor
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ABSTRACT: We review major FTTH technologies of TDM-PON and WDM-PON. We also discuss evolution to next generation access networks.
Lasers and Electro-Optics Society, 2007. LEOS 2007. The 20th Annual Meeting of the IEEE; 11/2007
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ABSTRACT: We demonstrate a WDM-PON by employing a double-contact Fabry-Prot Laser Diodes without a seed light injection. To avoid the high MPN at low frequency, we use a BPSK as a modulation format at a low RIN window. An error-free transmission is achieved by compensating a lasing envelope shift with the double contact F-P LD.
Optical Communication (ECOC), 2007 33rd European Conference and Ehxibition of; 10/2007
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ABSTRACT: An efficient evolution method from a TDM-PON to a next-generation PON is proposed and demonstrated. A single-type three-port wavelength band combiner/splitter enables an efficient evolution of TDM-PON maintaining the current PON infrastructure and wavelength plan.
Optical Internet, 2007 and the 2007 32nd Australian Conference on Optical Fibre Technology. COIN-ACOFT 2007. Joint International Conference on; 07/2007
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ABSTRACT: We investigate effects of back-reflection in wavelength division multiplexing passive optical networks having an injected seed light. We also estimate the maximum achievable fiber loss as a function of the linewidth of the seed light.
Optical Internet, 2007 and the 2007 32nd Australian Conference on Optical Fibre Technology. COIN-ACOFT 2007. Joint International Conference on; 07/2007
