发明名称 |
OPTICAL CODE GENERATION AND DETECTION BY MEANS OF FIBER BRAGG GRATINGS |
摘要 |
Optical code division multiple access (OCDMA) coder: decoder gratings have been fabricated. The modulated refractive index profile that makes up the OCDMA coder: decoder grating incorporates changes in polarity between OCDMA chips by discrete phase shifts, thereby to provide bipolar coding through phase modulation. (In another embodiment quadrupolar coding is achieved). For NRZ modulation, each grating section is either in phase with, or has a predetermined phase shift relative to, the preceding grating section, depending on whether the OCDMA signature has a change in polarity between chips. RZ modulation is also possible. Results are presented from specific examples of bipolar OCDMA with NRZ modulation, which show higher data rates (10 Gbit/s), shorter chip-lengths (6.4ps) and far longer code sequences (63 bits) than previously demonstrated. Other embodiments relate to optical packet switching, for example using the Internet Protocol (IP) or Asynchronous Transfer Mode (ATM).
|
申请公布号 |
WO0167643(A3) |
申请公布日期 |
2001.12.27 |
申请号 |
WO2001GB01076 |
申请日期 |
2001.03.09 |
申请人 |
UNIVERSITY OF SOUTHAMPTON;RICHARDSON, DAVID, JOHN;PETROPOULOS, PERIKLIS;IBSEN, MORTEN;TEH, PEH, CHIONG |
发明人 |
RICHARDSON, DAVID, JOHN;PETROPOULOS, PERIKLIS;IBSEN, MORTEN;TEH, PEH, CHIONG |
分类号 |
G02B6/02;G02F1/35;H04J14/00;(IPC1-7):G02B6/16;G02B6/34 |
主分类号 |
G02B6/02 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|