Fiber optic telecommunications card with energy level monitoring

• US 7,620,327 B2
• Filed: 07/03/2002
• Issued: 11/17/2009
• Est. Priority Date: 07/09/2001
• Status: Active Grant

• Current Assignee: Oyster Optics, LLC
• Original Assignee: Oyster Optics, Inc. (Oyster Optics, LLC)
• Inventors: Snawerdt, Peter
• Primary Examiner(s): Tran; Dzung D
• Application Number:
  US10/188,643
• Publication Number:
  US 20030007215A1
• Time in Patent Office: 2,694 Days
• Field of Search: 398150-152, 398/164, 398183- 86, 398/207, 398/135, 398166-168
• US Class Current: 398/164
• CPC Class Codes: H04B 10/071 using a reflected signal, e.g. using optical time domain reflectometers [OTDR]
• CPC Class Codes: H04B 10/07955 Monitoring or measuring power
• CPC Class Codes: H04B 10/85 Protection from unauthorised access, e.g. eavesdrop protection

Abstract

A transceiver card for a telecommunications box for transmitting data over a first optical fiber and receiving data over a second optical fiber. The card has transmitter for transmitting data over the first optical fiber, the transmitter having a laser and a modulator, a fiber output optically connected to the laser for connecting the first optical fiber to the card, a fiber input for connecting the second optical fiber to the card, a receiver optically connected to the fiber input for receiving data from the second optical fiber, and an OTDR optically connected between the transmitter and the fiber output or between the receiver and the fiber input. An energy level detector is also provided between the receiver and the fiber input.

Claims

1. A transceiver card for a telecommunications box for transmitting data over a first optical fiber and receiving data over a second optical fiber, the card comprising:

a transmitter for transmitting data over the first optical fiber, the transmitter having a laser, a modulator, and a controller receiving input data and controlling the modulator as a function of the input data, the transmitter transmitting optical signals for telecommunication as a function of the input data;

a fiber output optically connected to the laser for connecting the first optical fiber to the card;

a fiber input for connecting the second optical fiber to the card;

a receiver optically connected to the fiber input for receiving data from the second optical fiber; and

an energy level detector optically connected between the receiver and the fiber input to measure an energy level of the optical signals, wherein the energy level detector includes a plurality of thresholds.

2. The card as recited in claim 1 wherein the energy level detector includes an OR gate.

3. The card as recited in claim 1 wherein the modulator is a phase modulator.

4. The card as recited in claim 3 wherein the receiver receives phase-modulated signals.

5. The card as recited in claim 1 wherein the energy level detector includes a photodiode and a liner or logarithmic amplifier scaling an output of the photodiode.

6. The card as recited in claim 1 wherein the thresholds are programmable.

7. The card as recited in claim 1 wherein the energy level detector includes a detector controller capable of setting values for the thresholds.

8. The card as recited in claim 7 wherein the detector controller receives an indication of a threshold being crossed.

9. The card as recited in claim 1 wherein the plurality of thresholds bound an acceptable energy range for the received light.

10. The card as recited in claim 1 wherein the plurality of thresholds indicate a drop in amplitude of a phase-modulated signal.

11. The card as recited in claim 1 wherein the plurality of thresholds indicate an increase in an optical energy level.

12. The card as recited in claim 1 wherein the energy level detector measures optical power.

13. The card as recited in claim 1 further comprising a first splitter splitting the optical signal to the energy level detector, and a second splitter for an OTDR.

14. A transceiver card for a telecommunications box for transmitting data over a first optical fiber and receiving data over a second optical fiber, the card comprising:

a transmitter for transmitting data over the first optical fiber, the transmitter having a laser, a modulator and a controller receiving input data and controlling the modulator as a function of the input data, the transmitter transmitting optical signals for telecommunication as a function of the input data;

a fiber output optically connected to the laser for connecting the first optical fiber to the card;

a fiber input for connecting the second optical fiber to the card;

a receiver optically connected to the fiber input for receiving data from the second optical fiber; and

an energy level detector optically connected between the receiver and the fiber input input to measure an energy level of the optical signals, the energy level detector including a threshold indicating a drop in amplitude of a phase-modulated signal.

15. The card as recited in claim 14 wherein the energy level detector includes an OR gate.

16. The card as recited in claim 14 wherein the modulator is a phase modulator.

17. The card as recited in claim 14 wherein the receiver receives phase-modulated signals.

18. The card as recited in claim 14 wherein the energy level detector includes a photodiode and a liner or logarithmic amplifier scaling an output of the photodiode.

19. The card as recited in claim 14 wherein the threshold is programmable.

20. The card as recited in claim 14 wherein the energy level detector includes a detector controller capable of setting a value for the threshold.

21. The card as recited in claim 20 wherein the detector controller receives an indication of the threshold being crossed.

22. The card as recited in claim 14 wherein the plurality of thresholds bound an acceptable energy range for the received light.

23. The card as recited in claim 14 wherein the energy level detector measures optical power.

24. The card as recited in claim 14 further comprising a first splitter splitting the optical signal to the energy level detector, and a second splitter for an OTDR.

25. A transceiver card for a telecommunications box for transmitting data over a first optical fiber and receiving data over a second optical fiber, the card comprising:

a transmitter for transmitting data over the first optical fiber, the transmitter having a laser, a modulator and a controller receiving input data and controlling the modulator as a function of the input data, the transmitter transmitting optical signals for telecommunication as a function of the input data;

a fiber output optically connected to the laser for connecting the first optical fiber to the card;

a fiber input for connecting the second optical fiber to the card;

a receiver optically connected to the fiber input for receiving data from the second optical fiber; and

an energy level detector to measure an energy level of the optical signals, the energy level detector including a threshold indicating a drop in amplitude of a phase-modulated signal.

26. The card as recited in claim 25 wherein the energy level detector includes an OR gate.

27. The card as recited in claim 25 wherein the modulator is a phase modulator.

28. The card as recited in claim 25 wherein the receiver receives phase-modulated signals.

29. The card as recited in claim 25 wherein the energy level detector includes a photodiode and a liner or logarithmic amplifier scaling an output of the photodiode.

30. The card as recited in claim 25 wherein the threshold is programmable.

31. The card as recited in claim 25 wherein the energy level detector includes a detector controller capable of setting a value for the threshold.

32. The card as recited in claim 25 wherein the detector controller receives an indication of the threshold being crossed.

33. The card as recited in claim 25 wherein the plurality of thresholds bound an acceptable energy range for the received light.

34. The card as recited in claim 25 wherein the energy level detector measures optical power.

35. The card as recited in claim 25 further comprising a first splitter splitting the optical signal to the energy level detector, and a second splitter for an OTDR.

36. A transceiver card for a telecommunications box for transmitting data over a first optical fiber and receiving data over a second optical fiber, the card comprising:

a transmitter for transmitting data over the first optical fiber, the transmitter having a laser, a modulator and a controller receiving input data and controlling the modulator as a function of the input data, the transmitter transmitting optical signals for telecommunication as a function of the input data;

a fiber output optically connected to the laser for connecting the first optical fiber to the card;

a fiber input for connecting the second optical fiber to the card;

a receiver optically connected to the fiber input for receiving data from the second optical fiber;

a splitter to split at least a portion of the optical signals to form a split optical signal,

a photodetector to measure the split optical signal, the photodetector outputting an electric voltage to correlating to an optical power of the split optical signal, and

a detector controller connected electrically to the photodetector.

37. The card as recited in claim 36 wherein the modulator is a phase modulator.

38. The card as recited in claim 36 further comprising a photodiode and a liner or logarithmic amplifier scaling an output of the photodiode.

39. The card as recited in claim 36 further comprising a second splitter for an OTDR.