Pressure sensing guidewire systems including an optical connector cable

A system for determining fractional flow reserve, the system comprising:

• a pressure sensing guidewire including an optical pressure sensor and a first optical fiber extending proximally from the optical pressure sensor;
• an optical connector cable including a distal connector capable of being coupled to the guidewire;
• wherein the optical connector cable includes a second optical fiber that is capable of optically communicating with the first optical fiber;
• and
• a coupler disposed within the distal connector and disposed between the first optical fiber and the second optical fiber.

A system for determining fractional flow reserve, the system comprising:

• a pressure sensing guidewire including an optical pressure sensor and a first optical fiber extending proximally from the optical pressure sensor;
• wherein the first optical fiber has a first index of refraction;
• an optical connector cable including a rotatable distal connector capable of being rotatably coupled to the guidewire;
• wherein the optical connector cable includes a second optical fiber that is capable of optically communicating with the first optical fiber;
• wherein the second optical fiber has a second index of refraction;
• a coupler disposed within the optical connector cable and disposed between the first optical fiber and the second optical fiber;
• and
• wherein the coupler has a third index of refraction that is substantially the same as the first index of refraction, the second index of refraction, or both.