Imaging techniques using an imaging guidewire

A system for generating images of a body lumen, the system comprising:

• a transmit laser configured to transmit first optical signals at a first wavelength toward first blazed Bragg gratings configured to generate acoustic energies for imaging first regions in response to the first optical signals;
• a laser tracking circuit configured to track a position of a point on a slope of a transmission notch generated within a reflection band by a pair of fiber Bragg gratings;
• wherein the first blazed Bragg gratings are positioned between the pair of fiber Bragg gratings;
• and
• a controller configured to:
• tune the transmit laser to the first wavelength;
• and
• adjust an operating characteristic of the transmit laser using a change in the position of the point to compensate for a change in temperature.

A system for generating images of a body lumen, the system comprising:

• a transmit laser configured to transmit first optical signals at a first wavelength toward first blazed Bragg gratings configured to generate acoustic energies for imaging first regions in response to the first optical signals;
• a laser tracking circuit configured to track a position of a point on a slope of a transmission notch generated within a reflection band by a pair of fiber Bragg gratings, wherein the first blazed Bragg gratings are positioned between the pair of fiber Bragg gratings;
• and
• a receive laser configured to transmit second optical signals at a second wavelength on a second one of the plurality of optical fibers, the second optical signals to be modulated by the acoustic energies;
• a controller configured to:
• tune the transmit laser to the first wavelength;
• tune the receive laser to the second wavelength;
• and
• adjust an operating characteristic of the transmit laser using a change in the position of the point to compensate for a change in temperature;
• data acquisition circuitry configured to acquire information from the modulated second optical signals;
• and
• an imaging processing system configured to execute instructions that define an imaging algorithm to generate an image of the first region of the body lumen from the acquired information.