Laser-based system utilizing multiple laser beams

• US 9,755,755 B2
• Filed: 02/07/2016
• Issued: 09/05/2017
• Est. Priority Date: 01/17/2016
• Status: Active Grant

• Current Assignee: Vocalzoom Systems Ltd.
• Original Assignee: Vocalzoom Systems Ltd.
• Inventors: Blumkin, Alexander, Ganani, Amir, Fishman, Tal, Bakish, Tal
• Primary Examiner(s): Payne, David
• Assistant Examiner(s): KRETZER, CASEY L
• Application Number:
  US15/017,639
• Publication Number:
  US 20170207854A1
• Time in Patent Office: 576 Days
• Field of Search: 398132-134, 381172
• CPC Class Codes: H04B 10/503 Laser transmitters
• CPC Class Codes: H04B 10/506 Multiwavelength transmitters
• CPC Class Codes: H04R 23/008 using optical signals for detecting or generating sound
• CPC Class Codes: H04R 23/02 Transducers using more than one principle simultaneously

Abstract

A laser-based device or sensor includes: a first laser transmitter having a first self-mix carrier frequency; a second laser transmitter having a second, different, self-mix carrier frequency; a first monitor photodiode to receive a first optical signal from the first laser transmitter, and to output a first electric signal; a second monitor photodiode to receive a first optical signal from the second laser transmitter, and to output a second electric signal; an electric connection to connect together the first electric signal and the second electric signal, forming a combined electric signal; a single laser receiver to receive the combined electric signal and to generate from it a spectrum that corresponds to both (i) optical feedback of the first laser transmitter, and (ii) optical feedback of the second laser transmitter. Alternatively, a single monitor photodiode is used, receiving optical signals from multiple laser transmitters, and outputting a single electric signal to a single laser receiver.

Claims

1. A device comprising:

a first laser transmitter having a first self-mix carrier frequency;

a second laser transmitter having a second, different, self-mix carrier frequency;

a single monitor photodiode (A) to receive a first optical signal from the first laser transmitter, (B) to receive a second optical signal from the second laser transmitter, (C) to output a single electric signal that corresponds to both the first optical signal and the second optical signal;

a single laser receiver to receive the single electric signal and to generate from it a spectrum that corresponds to both (i) optical feedback of the first laser transmitter, and (ii) optical feedback of the second laser transmitter;

a single laser modulator connected to both the first laser transmitter and the second laser transmitter;

wherein said single laser modulator provides a same modulation to both the first laser transmitter and the second laser transmitter;

wherein the first laser transmitter has physical diameter of a first value;

wherein the second laser transmitter has physical diameter of a second, greater, value;

wherein, based on the different physical diameters of the first and second laser transmitters, said first and second laser transmitters transmit respectively a first laser beam and a second laser beam having two different self-mix carrier frequencies.