All-Optical Physical Layer NACK in AWGR-Based Optical Interconnects

Author

Proietti, Roberto ; Yin, Yawei ; Yu, Runxiang ; Ye, Xiaohui ; Nitta, Christopher ; Akella, Venkatesh ; Yoo, S.J.B.

Author_Institution

Dept. of Electr. & Comput. Eng., Univ. of California, Davis, CA, USA

Volume

24

Issue

5

fYear

2012

fDate

3/1/2012 12:00:00 AM

Firstpage

410

Lastpage

412

Abstract

This letter, proposes and experimentally demonstrates an all-optical physical layer negative acknowledgment (AO-NACK) technique to handle contention in array waveguide grating router (AWGR)-based optical interconnects. By using back-propagation in AWGR, the packets experiencing contention are reflected back to the senders in the optical domain to serve as a physical layer negative acknowledgement to trigger the retransmission. A host-switch distance of ≈ 20 m and a packet length of 204.8 ns are used in this proof-of-principle demonstration. Notification of AO-NACKs messages and successful packet retransmission and switching is demonstrated with error-free operation at 10 and 40 Gb/s.

Keywords

arrayed waveguide gratings; optical communication equipment; packet switching; telecommunication network routing; AWGR-based optical interconnects; all-optical physical layer NACK; array waveguide grating router; back-propagation; bit rate 10 Gbit/s; bit rate 40 Gbit/s; host-switch distance; negative acknowledgment; packet length; packet retransmission; packet switching; Adaptive optics; Optical buffering; Optical interconnections; Optical packet switching; Optical receivers; Optical reflection; Optical switches; All-optical; array waveguide gratings; data centers; negative acknowledgement; optical interconnects;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2011.2179923

Filename

6105521