Patent ID: 7430374

Claim:
A transceiver for inducing electric fields based on data to be transmitted in an electric field propagating medium and carrying out transmission and reception of data by using induced electric fields, comprising: a light source configured to generate lights of a single wavelength; an electric field detection unit configured to detect electric fields induced in and propagated through the electric field propagating medium by using lights from the light source, convert the electric fields into electric signals, and output the electric signals; and a control unit configured to control an operation of the light source according to an operation state of the transceiver; wherein the electric field detection unit further comprises: a collimating lens configured to turn lights from the light source into a parallel beam; an electro-optic element into which the parallel beam from the collimating lens is injected, which changes an optical characteristic according to electric fields coupled thereto; a coupling electrode configured to couple the electric fields induced in the electric field propagating medium to the electro-optic element, which is provided on one of opposing side faces of the electro-optic element that are located at positions for pinching the parallel beam propagating through the electro-optic element; an analyzer configured to split the parallel beam that passed the electro-optic element into P-polarization component and S-polarization component, and convert the P-polarization component and the S-polarization component into light intensity changes; and a photo-electric conversion unit configured to convert at least one of the P-polarization component and the S-polarization component split by the analyzer into electric signals.