Presentation Information
[B-6-10]Autonomous Wavelength Configuration Method Using Wavelength Utilization Information in FON
〇YAMATO SUGAWARA1, MASAKI MURAKAMI1, HIROKI DATE1 (1. NTT, Inc.)
Keywords:
Filterless Optical Network,All-Photonics Network,Wavelength Division Multiplexing,Digital Coherent Optics,Optical Transponder
Filterless optical networks (FONs) using passive optical components and digital coherent optics (DCOs) are being studied to reduce optical wavelength service costs in access networks. In a FON, wavelength-multiplexed signals are broadcast, so a receiver-side DCO must quickly find an available wavelength while avoiding wavelength collision. A previous method enabled autonomous wavelength configuration without a dedicated data communication network by adding wavelength information to the GCC0 field of an OTU4 frame. However, when the receiver-side DCO searches by itself, it must scan C-band candidate wavelengths sequentially because the signal center frequency is unknown. For a 4.8-THz band with 6.25-GHz spacing, up to 768 indices are searched; assuming 30 seconds per index, a full search takes about 6.4 hours. This paper proposes a method in which each carrier-side DCO adds whole-FON wavelength utilization information, including used and available wavelengths, to the GCC0 field of its transmitted OTU4 frame. The customer-side DCO scans predefined search indices and, after receiving any one wavelength, obtains the whole-FON utilization status and sets its transmit wavelength. With eight search indices, the maximum time to first reception is about four minutes, greatly reducing optical path provisioning lead time.