Optical label swapping using payload envelope detection circuits

Author

Hu, Zhaoyang ; Doshi, Roopesh ; Chou, Hsu-Feng ; Poulsen, Henrik N. ; Wolfson, David ; Bowers, John E. ; Blumenthal, Daniel J.

Author_Institution

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

Volume

17

Issue

7

fYear

2005

fDate

7/1/2005 12:00:00 AM

Firstpage

1537

Lastpage

1539

Abstract

Optical label swapping of 10-Gb/s nonreturn-to-zero (NRZ) labels attached to 40-Gb/s return-to-zero payloads is demonstrated using payload envelope detection (PED) circuits based on 40-Gb/s clock recovery with nanosecond locking time. The circuits generate a digital envelope signal representing the payload location without having to process the 40-Gb/s data. The low-frequency PED signal, which is generated from the recovered 40-GHz packet clock by a radio-frequency mixer, can be utilized to erase/rewrite the label through traveling-wave electroabsorption modulators. This approach does not require active timing control to erase the label. Nearly penalty-free rewriting of a new 10-Gb/s NRZ label was demonstrated.

Keywords

electro-optical modulation; electroabsorption; microwave mixers; microwave photonics; optical fibre networks; optical switches; packet switching; synchronisation; 10 Gbit/s; 40 Gbit/s; NRZ; clock recovery; label erasing; label rewriting; nanosecond locking time; nonreturn-to-zero labels; optical label swapping; payload envelope detection circuits; radio-frequency mixer; return-to-zero payloads; traveling-wave electroabsorption modulator; Circuits; Clocks; Envelope detectors; Multiprotocol label switching; Optical signal processing; Payloads; Radio frequency; Signal generators; Signal processing; Timing; Clock recovery (CR); label swapping; optical label swapping network; packet switching;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2005.848541

Filename

1453669