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The 1500 nm stabilised He-Ne transverse Zeeman laser (STZL) equipment is now well established, and the laser used in this equipment is specially fabricated to give a goodquality Zeeman beat frequency curve. The measurement of IF fluctuation given by two such STZLs beating with each other shows that the frequency stability of these lasers is about ?1.25 MHz for a long running time. The equipment is...
A coherent optical fibre system is studied in which two Zeeman lasers are used as local oscillator and transmitter laser, and which work independently of each other without any frequency tracking loop, which is usually indispensable in coherent optical systems. The system works satisfactorily. The intermediate frequency can be arbitrarily tuned from about 400 MHz to 4 MHz.
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