Current Optics and Photonics

Optical Society of Korea (한국광학회)
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Optical-Layer Restoration in a Self-Healing Ring Network Using a Wavelength-Blocker-based Reconfigurable Optical Add/Drop Multiplexer

  • Lee, Jiwon (School of Electrical and Computer Engineering, University of Seoul) ;
  • Kim, Chul Han (School of Electrical and Computer Engineering, University of Seoul)
  • Received : 2017.12.21
  • Accepted : 2018.01.03
  • Published : 2018.02.25
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Abstract

Optical-layer restoration has been demonstrated with a wavelength-blocker (WB) -based reconfigurable optical add/drop multiplexer (ROADM). Two $2{\times}2$ optical switches with a control circuit were placed before and after a WB-based ROADM to provide automatic path restoration under fiber-failure conditions. Using the proposed node configuration, a 3-node self-healing ring (SHR) network has been implemented to demonstrate the feasibility of the automatic optical-layer restoration. From the results, the restoration time was measured to be ~4 ms under fiber-failure conditions, without any additional power penalty in receiver sensitivity.

Keywords

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FIG. 1. (a) Proposed node configuration with a wavelength-blocker (WB) -based reconfigurable optical add/drop multiplexer (ROADM). (b) Node configuration for a four-fiber bidirectional self-healing ring network. Acronyms are rbium-doped fiber amplifier, EDFA; optical coupler, OC; optical switch, OS; and arrayed waveguide grating, AWG.

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FIG. 2. Measured switching response of an optical switch. Upper and lower traces represent respectively the driving electrical voltage and optical power of one output port.

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FIG. 3. (a) A 3-node self-healing ring (SHR) network for one-way signal transmission under normal conditions. (b) Optical-layer restoration under fiber-cut conditions between Nodes 1 and 2. Acronyms are optical switch, OS; and reconfigurable optical add/drop multiplexer, ROADM.

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FIG. 4. Measured optical power of one dropped channel at Node 3, before and after a fiber cut.

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FIG. 5. (a) Measured optical spectra of the dropped channels at Node 3, efore and after a fiber cut. (b) Measured bit-error-rate curves of one dropped channel at Node 3, transmitted through only working fiber ( ) and through both working and protection fibers (▲). In both measurements, the dropped channel at Node 3 was originally added to the network at Node 1.

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