Optical communication device

• US 7,127,178 B2
• Filed: 06/28/2001
• Issued: 10/24/2006
• Est. Priority Date: 06/29/2000
• Status: Expired due to Fees

• Current Assignee: ECI Telecom Limited (Shaul Shani)
• Original Assignee: ECI Telecom Limited (Shaul Shani)
• Inventors: Mahlab, Uri
• Primary Examiner(s): Phan, Hanh
• Application Number:
  US10/312,724
• Publication Number:
  US 20040008922A1
• Time in Patent Office: 1,944 Days
• Field of Search: 359/124, 398140-142, 398/79, 398/159, 398/158, 398/66, 398/67, 398/68, 398/70, 398/21, 398/72, 398/82, 398/147, 398/148, 385/123, 385/124, 385/1, 385/126, 385/127
• US Class Current: 398/141
• CPC Class Codes: H04B 10/2507 for the reduction or elimination of distortion or dispersion

Abstract

An optical extending device for use in transmission of optical signals which comprise at least one sequence of periodic optical signals, said optical device comprising: a first fiber optic having a characteristic dimensional propagation coefficient equal to β₁ and adapted to be connected to a single mode second fiber optic having a length equal to L₀ and a characteristic dimensional propagation coefficient equal to β₀, wherein L_p, the length of said first fiber optic is substantially equal to {[T²/Π−L₀*β₀]/β₁}*{1−MOD(L₀/{T²/Π−L₀*β₀]/g(b)}} and wherein: n is an integer 1, 2, 3 . . . and is selected in accordance L₀, the length of the single mode second fiber optic; T is a time period of the periodic optical signals; and MOD is the remainder obtained from dividing 1₀ by {[T²/Π−L₀*β₀]/β₁}.

Claims

1. An optical extending device for use in transmission of optical signals which comprise at least one sequence of periodic optical signals, said optical device comprising:

a first fiber optic having a characteristic dimensional propagation coefficient equal to β

₁ and adapted to be connected to a single mode second fiber optic having a length equal to L₀ and a characteristic dimensional propagation coefficient equal to β

₀ wherein L_P, the length of said first fiber optic is substantially equal to

{[T²/π

−

L₀*β

₀]/β

₁}*{1−

MOD(L₀/{[T²/π

−

L₀*β

₀]/β

₁}}

and the overall length of said first and second fiber optics is n·

L_P

and wherein;

n is an integer 1, 2, 3. . . , and is selected in accordance L₀, the length of said single mode second fiber optic;

T is a time period of the periodic optical signals; and

MOD is the remainder obtained from dividing L₀ by {[T²/π

−

L₀*β

₀]/β

₁}.

2. An optical communication device comprising:

an optical connector adapted to connect a single mode optical fiber having a length equal to L₀ and a characteristic dimensional propagation coefficient equal to β

₀, with at least one optical fiber extension;

at least one optical extending device of claim 1; and

an optical signal egress means.

3. An optical communication device according to claim 2, comprising a plurality of optical extending devices.

4. An optical communication device according to claim 3, wherein at least some of said plurality of optical fiber extensions are adapted to convey telecommunication signals at different wavelengths.

5. A system according to claim 4, wherein said periodic signals are used in routing addresses.

6. A system according to claim 4, wherein said periodic signals are used for classification.

7. A system according to claim 4, wherein said periodic signals are used for monitoring.

8. An optical extending device according to claim 1, wherein β

₀=β

₁.

9. An optical extending device according to claim 1, wherein the characteristic dimensional propagation coefficient of said optical extending device is fixed to be equal to [T²/π

−

L₀*β

₀]/L_P, by subjecting said optical extending device to operate under appropriate voltage.

10. An optical extending device according to claim 1, wherein said periodic optical signals are transmitted at a bit rate of at least 10 GHz.

11. A telecommunication router comprising least one optical extending device of claim 1 and adapted to receive optical communication information that is comprised of an address information and a payload information,

wherein the address information comprises at least one sequence of periodic optical signals,

and wherein, said telecommunication router is adapted to forward said payload information in accordance with the address information.

12. A telecommunication network comprising a plurality of network elements each adapted to receive optical communication information and convert it into a corresponding electrical form, said network elements being optically connected to their neighboring elements, wherein at least one of said network elements is provided with at least one optical extending device of claim 1, and wherein L₀ is the equivalent length of an optical link extending between the at least one of said network elements provided with the at least one optical extending device and the corresponding neighboring network elements thereof.

13. A telecommunication system comprising:

at least one optical transmitter;

an optical link adapted to convey periodic communication signals transmitted by said transmitter;

a self signal constructor adapted to convey said periodic telecommunication signals transmitted along said optical link and forward them, comprising at least one fiber optic extension having a characteristic dimensional propagation coefficient that is equal to β

₁ and having a length that is substantially equal to

{[T²/π

−

L₀*β

₀]/β

₁}*{1−

MOD(L₀/{[T²/π

−

L₀*β

₀]/β

₁}}

and the overall length of said optical link and said at least one fiber optic extension is n·

L_P

wherein;

L₀ is the length of said optical link;

β

₀ is a characteristic dimensional propagation coefficient of a single mode optical fiber of said optical link;

n is an integer 1, 2, 3. . . , selected in accordance with the value of L₀;

T is a time period of said periodic communication signals; and

at least one optical receiver.

14. A system according to claim 13, wherein said periodic signals are used for synchronization.

15. A telecommunication system comprising:

a plurality of first optical transceivers for conveying optical transmissions, each of said first optical transceivers having an index i;

at least one second optical transceiver; and

a plurality of optical fibers for coupling said first optical transceivers to said at least one second optical transceiver for placing said at least one second optical transceiver in communication with said plurality of first optical transceivers,

wherein;

each of said plurality of optical fibers comprises a first fiber optic portion and a second fiber optic portion,

said first fiber optic portion has a characteristic dimensional propagation coefficient equal to β

_1i,

said second fiber optic portion has a length equal to L_0i and a characteristic dimensional propagation coefficient equal to β

_0i, and

each of said plurality of optical fibers has an overall length that is substantially equal to;

n·

{[T_i²/π

−

L_0i*β

_0i]/β

_1i}*{1−

MOD(L_0i/{[T_i²/π

−

L_0i*β

_0i*β

_1i}}

where;

n is an integer 1, 2, 3. . . and is selected in accordance with the length L_0i associated with the respective optical fiber,

T_i is a time period of the period optical signal in the respective optical fiber, and

MOD is the remainder obtained from dividing L_0i by {[T_i²/π

−

L_0i*β

_0i]/β

_1i}.

16. A telecommunication apparatus according to claim 15, wherein an optical transmission received at said second optical transceiver is detected and converted to its corresponding electrical form.

17. A telecommunication apparatus according to claim 15, wherein the optical transmission received at said second optical transceiver is detected and is wavelength converted.

18. A telecommunication apparatus according to claim 15, wherein said telecommunication apparatus further comprises a multiplexing/demultiplexing device operative in communication with any of said plurality of first optical transceivers.