Title :
Linearization of an interferometric modulator at microwave frequencies by polarization mixing
Author :
Johnson, L.M. ; Roussell, H.V.
Author_Institution :
MIT Lincoln Lab., Lexington, MA, USA
Abstract :
The linearization of all interferometric modulator by polarization mixing over the suboctave frequency range of 3.6 to 5.6 GHz is reported. A traveling-wave modulator fabricated in X-cut LiNbO/sub 3/ utilizing the r/sub 33/ (TE) and r/sub 13/ (TM) electrooptic coefficients was employed. The effective V/sub pi /s (from a 50- Omega source) were 14 and 43 V for the TE and TM modes, respectively. The modulator response was not optimized for this frequency range. A DC voltage was used to separate bias electrodes to adjust the relative TE and TM phase bias. A polarizer was placed between the diode-pumped Nd:YAG laser source, and the modulator to adjust the relative TE and TM optical power. The modulator output was measured with a high-speed photodetector and spectrum analyzer.<>
Keywords :
electro-optical devices; light interferometers; light polarisation; lithium compounds; optical modulation; optical polarisers; 14 V; 3.6 to 5.6 GHz; 43 V; 50 ohm; DC voltage; LiNbO/sub 3/; TE modes; TM modes; YAG:Nd; YAl5O12:Nd; analog optical link; diode-pumped Nd:YAG laser source; electrooptic coefficients; high-speed photodetector; integrated optics; interferometric modulator; linearization; microwave frequencies; phase bias; polarization mixing; polarizer; suboctave frequency range; traveling-wave modulator; Chirp modulation; Diodes; Electrodes; Electrooptic modulators; Frequency; Laser modes; Optical polarization; Power lasers; Tellurium; Voltage;
Conference_Titel :
Broadband Analog Optoelectronics: Devices and Systems, 1990. Conference Digest., LEOS Summer Topical on
Conference_Location :
Monterey, CA, USA
DOI :
10.1109/BAODS.1990.205503
