Optical frequency hopping system based on optical circulator and transmitter

The invention discloses an optical frequency hopping system based on an optical circulator and a transmitter. The optical frequency hopping system includes: an annular modulation unit, whereinthe annular modulation unit comprises a plurality of optical circulators; the first port of each optical circulator receives different optical carriers; a second port of each optical circulator is connected with an optical coupler, each optical coupler is connected with a phase modulator and is combined with frequency hopping coding in a pseudo-random code generator to realize coding modulation of an optical carrier signal, and a third port of each optical circulator respectively outputs the coded and modulated optical carrier signal; a transmitter which is internally provided with the annular modulation unit and is used for transmitting the optical carrier signal encrypted by the annular modulation unit; a receiver which is used for receiving the encrypted optical carrier signal and decrypting the encrypted optical carr