Optical Re-Modulation in DWDM Radio-Over-Fiber Network

• US 20070292143A1
• Filed: 06/11/2007
• Published: 12/20/2007
• Est. Priority Date: 06/14/2006
• Status: Abandoned Application

• Current Assignee: NEC Laboratories America Inc (NEC Corporation)
• Original Assignee: NEC Laboratories America Inc (NEC Corporation)
• Inventors: Xu, Lei, Wang, Ting, Yu, Jianjun
• Application Number:
  US11/761,021
• Publication Number:
  US 20070292143A1
• Time in Patent Office: Days
• US Class Current: 398/188
• CPC Class Codes: H04B 10/25754 Star network topology

Abstract

An apparatus includes multiple signal paths for optically converting an optical signal to multiples of the optical signal at different respective carrier frequencies for reducing interference between wireless transmissions of the multiples of the optical signal. Preferably, the converting includes a first modulator for modulating the optical signal into a first optical carrier and an initial first-order sideband signal with a frequency spacing twice that of the first optical carrier and a first interleaver for separating the first optical carrier and the initial first-order sideband signal. The converting also includes a second phase modulator for modulating the first optical carrier into a second optical carrier and a second first-order sideband signal with a frequency spacing twice that of the second optical carrier.

Claims

1. An apparatus comprising:

multiple signal paths for optically converting an optical signal to multiples of said optical signal at different respective carrier frequencies for reducing interference between wireless transmission of said multiples of said optical signal.

2. The apparatus of claim 1, wherein said converting comprises a first modulator for modulating said optical signal into a first optical carrier and an initial first-order sideband signal with a frequency spacing twice that of the first optical carrier and a first interleaver for separating the first optical carrier and the initial first-order sideband signal.

3. The apparatus of claim 2, wherein said converting comprises a second phase modulator for modulating the first optical carrier into a second optical carrier and a second first-order sideband signal with a frequency spacing twice that of the second optical carrier.

4. The apparatus of claim 3, wherein said converting comprises a second interleaver for separating the second optical carrier and the second first-order sideband signal.

5. The apparatus of claim 4, wherein said converting comprises a third phase modulator for modulating the second optical carrier into a third optical carrier and a third first-order sideband signal with a frequency spacing twice that of the third optical carrier.

6. The apparatus of claim 5, wherein said converting comprises a third interleaver for separating the third first-order sideband signal.

7. The apparatus of claim 1, wherein said optical converting comprises a first modulator for converting an optical signal to a first optical carrier and sideband signal centered about the first optical carrier, a filter for separating the first optical carrier, and a second modulator for converting the first optical carrier to a second optical carrier with sideband signal centered about the second optical carrier.

8. A method comprising:

optically converting an optical signal to multiples of said optical signal at different respective carrier frequencies for reducing interference between wireless transmission of said multiples of said optical signal.

9. The method of claim 8, wherein said converting comprises modulating said optical signal into a first optical carrier and an initial first-order sideband signal with a frequency spacing twice that of the first optical carrier and separating the first optical carrier and the initial first-order sideband signal.

10. The method of claim 9, wherein said converting comprises modulating the first optical carrier into a second optical carrier and a second first-order sideband signal with a frequency spacing twice that of the second optical carrier.

11. The method of claim 10, wherein said converting comprises separating the second optical carrier and the second first-order sideband signal.

12. The method of claim 11, wherein said converting comprises a modulating of the second optical carrier into a third optical carrier and a third first-order sideband signal with a frequency spacing twice that of the third optical carrier.

13. The method of claim 12, wherein said converting comprises a separating the third first-order sideband signal.

14. The method of claim 8, wherein said optical converting comprises a first converting of the optical signal to a first optical carrier and sideband signal centered about the first optical carrier, separating the first optical carrier, and a converting the first optical carrier to a second optical carrier with sideband signal centered about the second optical carrier.

15. A method comprising:

converting an optical signal into a first optical carrier and an initial first-order sideband signal with a frequency spacing twice that of the first optical carrier, and

separating the first optical carrier and the initial first-order sideband signal for subsequent converting of the first optical carrier into a second optical carrier and a second first-order sideband signal with a frequency spacing twice that of the second optical carrier.