An athermal grating design has a Bragg grating unit and a lever arrangement. In operation, the Bragg grating unit responds to an optical signal, a change of temperature and a lever force for offsetting thermally-induced changes in the Bragg grating unit, for providing a grating signal that does not change...http://www.google.de/patents/US6453108?utm_source=gb-gplus-sharePatent US6453108 - Athermal bragg grating package with course and fine mechanical tuning
