Chiral Photonics, Pine Brook, NJ, has extended its Helica line with a fiber-optic temperature sensor designed for applications that require stability to 1000°C. The sensor is based on the company's chiral grating technology, in which a monolithic glass fiber is twisted as it is passed through a miniature heat zone to produce a distinct dip in the transmission spectrum. The spectral position of the dip in the chiral fiber changes with temperature, allowing it to act as a temperature sensor. The sensor features 1% accuracy, 0.01 nm/°C (nominal) sensitivity, 15 mm sensor/grating length, and it is placed 25 mm from the probe tip. Sensor packaging can be tailored to the application.