Optical alignment system

• US 6,430,337 B1
• Filed: 09/03/1998
• Issued: 08/06/2002
• Est. Priority Date: 09/03/1998
• Status: Expired due to Term

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: Agere Systems Incorporated (Broadcom, Inc.)
• Inventors: Bergmann, Ernest E., Fairchild, Stephen K.
• Primary Examiner(s): Ullah, Akm E.
• Assistant Examiner(s): CONNELLY, MICHELLE R
• Application Number:
  US09/145,988
• Time in Patent Office: 1,433 Days
• Field of Search: 385/15-26, 385/31-38, 385/47, 385/49, 385/50, 385/52-94, 385/139
• US Class Current: 385/25
• CPC Class Codes: G02B 6/2937 In line lens-filtering-lens devices, i.e. elements arranged along a line and mountable in a cylindrical package for compactness, e.g. 3- port device with GRIN lenses sandwiching a single filter operating at normal incidence in a tubular package
• CPC Class Codes: G02B 6/3528 the optical element being a prism
• CPC Class Codes: G02B 6/4222 by observing back-reflected light

Abstract

An optical system is provided with an optical assembly and a wavelength division multiplexer surface for transmitting a light beam. The optimal alignment of these light beams is accomplished by adjusting a steering device, which includes an optical wedge or a universal coupling, until the light path of the transmitted light beam through the optical assembly aligns with the light path of the transmitted light beam through the wavelength division multiplexing surface.

Claims

1. A multiple optical fiber device, comprising:

first and second optical elements, the first optical element having a first light path directed toward the second optical element and the second optical element being rotatable with respect to the first optical element; and

an adjustable steering assembly for aligning the first light path, the adjustable steering assembly being located between the first and second optical elements, and being fully rotatable with respect to each of the first optical element and the second optical element.

2. The device of claim 1, wherein the adjustable steering assembly includes an optical wedge.

3. The device of claim 1, wherein the adjustable steering assembly includes a ball joint.

4. The device of claim 1, wherein the first optical element includes a source of collimated light.

5. The device of claim 4, wherein the second optical element includes a wavelength division multiplexing surface for transmitting the collimated light.

6. The device of claim 4, wherein the second optical element includes a partially reflecting surface that both transmits and reflects the collimated light.

7. An optical device, comprising:

an optical assembly for transmitting a light beam;

a wavelength division multiplexing surface for transmitting and reflecting the light beam; and

an adjustable steering assembly for aligning the optical assembly and the wavelength division multiplexing surface, the adjustable steering assembly being located between the optical assembly and the wavelength division multiplexing surface, wherein the adjustable steering assembly is fully rotatable with respect to the optical assembly.

8. An optical device, comprising:

an optical assembly for transmitting a light beam;

a coated surface that reflects and transmits for reflecting and transmitting the light beam; and

an adjustable steering assembly for aligning the optical assembly and the coated surface that reflects and transmits, the adjustable steering assembly being located between the optical assembly and the,coated surface that reflects and transmits, wherein the adjustable steering assembly is fully rotatable with respect to the optical assembly.

9. The optical device of claim 8, wherein the adjustable steering assembly includes a universal coupling with curved surfaces.

10. The optical device of claim 8, wherein the adjustable steering assembly includes an optical wedge.

11. The optical device of claim 8, wherein the optical assembly includes a dual fiber connection for transmitting a communication signal.

12. The optical device of claim 8, wherein the optical assembly includes a pump laser.

13. An optical amplifier device, comprising:

a first housing supporting a first optical element defining a first light path;

a second housing supporting a second optical element defining a second light path; and

an adjustable element for changing the direction of the first light path to cause the first light path to align with the second light path, the adjustable element being located between the first and second housings and being fully rotatable with respect to the first and second housings.

14. The amplifier device of claim 13, wherein the adjustable element includes an optical wedge.

15. The amplifier device of claim 13, wherein the adjustable element includes nesting spherical surfaces.

16. The amplifier device of claim 15, further comprising a pump laser for amplifying a communication signal.

17. The amplifier device of claim 13, further comprising a dual fiber termination, a wavelength division multiplexing surface, and a lens located between the dual fiber termination and the wavelength division multiplexing surface.

18. The amplifier device of claim 17, wherein the lens has a gradient index.

19. The amplifier device of claim 17, further comprising a second dual fiber termination, a second wavelength division multiplexing surface, and a second lens located between the second dual fiber termination and the second wavelength division multiplexing surface.

20. The amplifier device of claim 19, wherein the wavelength division multiplexing surface reflects the communication signal.

21. The amplifier device of claim 19, wherein the wavelength division multiplexing surface transmits the communication signal.

22. A method of making a multiple optical fiber system, said method comprising the steps of:

transmitting a first light beam along a first axis through a first optical element;

adjusting the position of a fully rotatable steering assembly located between the first optical element and a second optical element to change the position of the first light beam, the step of adjusting the position including the step of rotating rotating the steering assembly about the first axis; and

transmitting the first light beam having a changed position through the second optical element.

23. The method of claim 22, further comprising the step of measuring the intensity of the light beam in the second optical element.

24. The method of claim 23, wherein the step of transmitting the light beam through the first optical element includes the step of transmitting the light beam through a dual fiber termination.

25. The method of claim 24, further comprising the step of reflecting a second light beam incident on the wavelength division multiplexing surface, the wavelength of the second light beam being different than the wavelength of the first light beam.

26. The method of claim 25, wherein the step of rotating the steering assembly includes the step of rotating an optical wedge.

27. The method of claim 22, wherein the step of transmitting the light beam through the first optical element includes the step of transmitting the light beam through a wavelength division multiplexing surface.

28. The method of claim 22, wherein the step of adjusting the position of the steering assembly includes the step of changing the relative positions of nesting spherical surfaces.

29. A method of operating an optical amplifier device, the method comprising the steps of:

transmitting a pump laser beam through a first housing along a first light path;

transmitting a modulated communication signal through a second housing along a second light path;

changing the direction of light propagating through the optical amplifier device with a fully rotatable adjustable steering assembly to align the first and second light paths; and

subsequently, multiplexing the pump laser beam and the modulated communication signal to amplify the modulated communication signal.

30. The method of claim 29, further comprising the step of using a wavelength division multiplexing surface to selectively transmit and reflect the pump laser beam and the modulated communication signal.

31. The method of claim 30, further comprising the step of transmitting the pump laser beam through a dual fiber termination.

32. The method of claim 30, further comprising the step of transmitting the modulated communication signal through a dual fiber termination.

33. The method of claim 29, further comprising the step of using a lens to transmit light toward and away from the wavelength division multiplexing surface.