phase modulator การใช้

• A beam splitter divides the laser light into two paths, one of which has a phase modulator as described above.
• The signals feeding the phase modulator and the envelope modulator are further phase-shifted by 90?with respect to each other.
• For example, the 2H21 " phasitron " phase modulator tube used in early FM broadcast transmitters was assigned an " H " ( octode ) designator, when it would have been a perfect candidate for the otherwise unused " T " category for deflection controlled tubes.