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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 39, Iss. 29 — Oct. 10, 2000
  • pp: 5280–5294

All-optical 100-gbit/s word packet time-division-multiplexed access node in a looped-back configuration: enabling technologies for sequential add–drop functionality

Janet W. Lou, Yi Liang, Ozdal Boyraz, and Mohammed N. Islam  »View Author Affiliations


Applied Optics, Vol. 39, Issue 29, pp. 5280-5294 (2000)
http://dx.doi.org/10.1364/AO.39.005280


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Abstract

We experimentally demonstrate the adding, dropping, and passing through of 100-Gbit/s word packets in a looped-back all-optical time-division-multiplexed (TDM) access node. Packets are routed with a 17-dB contrast ratio and demultiplexed with a 20-dB contrast ratio. This node uses short 100-Gbit/s words to demonstrate its potential to process data packets from multiple sources and to perform packet switching in a multinode ring network configuration. The ability to tolerate timing jitter as well as varying input signal characteristics is essential to an all-optical access node in a multinode network. For 2-ps input pulses, the header processor has a timing window of ∼5 ps, and the demultiplexer has a timing window of ∼5.5 ps. This allows for tolerance to bit-to-bit timing jitters or to an increase in the pulse width of as much as 3 ps. Packet-to-packet timing jitter is detected and compensated by the technique used to synchronize the local source to each packet. The key enabling technologies of an all-optical TDM packet add–drop multiplexer are discussed, including an erbium-doped fiber laser, a nonlinear optical loop mirror logic gate, self-synchronization to incoming packets with a fast-saturation/slow-recovery gain element followed by an intensity discriminator, a two-wavelength nonlinear optical loop mirror demultiplexer, and synchronization of new packets to the network packet rate with a phase-locked loop. The local source is automatically synchronized to the incoming packet, because it uses an extracted pulse from the packet, which has a contrast ratio of >20 dB to the rest of the packet. Finally, new packets are added by use of a local laser and a synchronization method, which gives a timing jitter of ∼1 ps. Using a statistical method of measuring Q value with picosecond resolution, we show that a header processor with two cascaded logic gates has a Q value of 7.1 with a 95% confidence level.

© 2000 Optical Society of America

OCIS Codes
(060.2330) Fiber optics and optical communications : Fiber optics communications
(060.4250) Fiber optics and optical communications : Networks
(060.4510) Fiber optics and optical communications : Optical communications
(190.0190) Nonlinear optics : Nonlinear optics
(190.4360) Nonlinear optics : Nonlinear optics, devices
(230.1150) Optical devices : All-optical devices

History
Original Manuscript: August 2, 1999
Revised Manuscript: July 7, 2000
Published: October 10, 2000

Citation
Janet W. Lou, Yi Liang, Ozdal Boyraz, and Mohammed N. Islam, "All-optical 100-gbit/s word packet time-division-multiplexed access node in a looped-back configuration: enabling technologies for sequential add–drop functionality," Appl. Opt. 39, 5280-5294 (2000)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-39-29-5280

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