GLV based fiber optic transmitter

• US 7,113,320 B2
• Filed: 02/06/2003
• Issued: 09/26/2006
• Est. Priority Date: 02/06/2003
• Status: Expired due to Fees

• Current Assignee: Evans & Sutherland Computer Corp. (Elevate Entertainment, Inc.)
• Original Assignee: Evans & Sutherland Computer Corp. (Elevate Entertainment, Inc.)
• Inventors: Tanner, Allen H.
• Primary Examiner(s): Dang, Hung Xuan
• Assistant Examiner(s): TRA, TUYEN Q
• Application Number:
  US10/361,056
• Publication Number:
  US 20040156088A1
• Time in Patent Office: 1,328 Days
• Field of Search: 359/290, 359/291, 359/224, 359/230, 359/231, 359/572, 359/573, 359/563, 359/566, 359/570, 359/571
• US Class Current: 359/290
• CPC Class Codes: G02B 26/0808 by means of one or more diffracting elements

Abstract

A communications transmitter is disclosed that utilizes a grating light valve (GLV) to impose information on an optical signal. The communications transmitter further includes at least one laser light source, a frequency dispersing device, an electrostatic modulator that serves as a GLV, and at least one data input source. The laser light source is configured to produce a light beam having a specific optical bandwidth and the frequency dispersing device is optically coupled to the light source and configured to disperse the light beam to produce a frequency dispersed light. The electrostatic modulator includes an electrostatically responsive reflective ribbon oriented to receive a portion of the frequency dispersed light having a specified bandwidth. The signal input source typically serves as an analog input source and is electronically coupled to each electrostatic modulator and is configured to cause electrostatic deformation of the reflective ribbon to modify the frequency of light received thereon to produce a modulated reflected light beam.

Claims

1. A grating light valve (GLV) for use in communications comprising:

a) at least one electrostatically responsive reflective ribbon oriented to receive and reflect an incident light beam having a specified bandwidth; and

b) a signal transmission device, coupled to the at least one reflective ribbon, to provide at least one analog voltage to the at least one reflective ribbon to generate mechanical movement of the reflective ribbon to impose information to the reflected incident light beam by modulating the frequency of the incident light beam to produce a modulated reflected light beam.

2. The GLV of claim 1 further comprising a switch to electronically couple the ribbon and the analog voltage.

3. The GLV of claim 1, wherein the signal transmission device receives a digital data stream and converts the digital data stream to the at least one analog voltage.

4. The GLV of claim 1, wherein the mechanical movement of the reflective ribbon imparts a Doppler effect frequency modulation of the incident light.

5. A communications transmitter comprising:

a) at least one laser light source that produces a light beam having a specified optical bandwidth;

b) a frequency dispersing device, which is optically coupled to the light source, to disperse the light beam; and

c) at least one grating light valve modulator comprising an electrostatically responsive reflective ribbon oriented to receive and reflect a portion of the dispersed light beam within a specified bandwidth; and

d) an analog input signal electrically coupled to the at least one grating light valve modulator, the analog input signal being utilized to cause mechanical deformation of the reflective ribbon to frequency modulate the reflected portion of the dispersed light beam to produce a modulated reflected light beam.

6. The transmitter of claim 5, further comprising between 2 and 10,000 grating light valve modulators each independently modulated using an analog signal.

7. The transmitter of claim 5, wherein the laser light source is a broadband light source at a wavelength of 1310 nm and optical bandwidth of 10 to 100 GHz.

8. The transmitter of claim 5, wherein said frequency dispersing device is a diffraction grating device.

9. The transmitter of claim 5, further comprising a collimating lens placed after the frequency dispersing device and before the grating light valve modulator, the collimating lens being utilized to collimate the dispersed light beam into a series of bandwidths.

10. The transmitter of claim 5, where the grating light valve modulator further comprises a transistor coupled to the ribbon.

11. The transmitter of claim 5, further comprising coupling optics optically connected to the modulated reflected light beam to direct the modulated reflected light beam to a fiber optic cable for transmission.

12. The transmitter of claim 5, wherein the signal transmission device includes a digital-to-analog converter, to convert a digital input signal to the analog input signal.

13. A method of transmitting information comprising the steps of:

a) providing a laser light source to emit a laser light having a specified optical bandwidth;

b) dispersing the laser light emitted from said laser light source to create a dispersed laser light;

c) directing the dispersed laser light to at least one grating light valve modulator having an electrostatically responsive ribbon; and

d) electrostatically deforming the electrostatically responsive ribbon within the at least one grating light valve modulator using an analog voltage source to impose information on a portion of the dispersed laser light to produce a frequency modulated signal within the given bandwidth of frequencies.

14. The method of claim 13 further comprising simultaneously performing steps c) and d) to produce additional modulated signals.

15. The method according to claim 14 further comprising the steps of:

e) combining all the modulated signals; and

f) transmitting the combined signals to at least one destination.

16. The method according to claim 13 comprising after the dispersing step, collimating the dispersed light beam prior to reaching the at least one grating light valve modulator.