F-tone Networks's Free Space Isolators are used in various TOSAs, which require isolation to prevent feedback into the laser. This product is available in single and double stage designs. The Free Space Isolators offer excellent performance with low insertion loss and high isolation. F-tone Networks’s proprietary bonding process, combined with years of volume manufacturing experience, results in a high reliability record. Bare isolator chips survive more than 5,000 hours of damp heat testing without delamination.