Octuple frequency mm-wave generation was reported by using multicascaded intensity modulators based on optical carrier suppression
(OCS) scheme .
Generation of mm wave using external modulation can be classified based on intensity, integration, and phase and carrier suppression
. Intensity modulation technique can be further subdivided based on interconnection, optical principle and by local oscillator.
In , we proposed a new approach to generate quadrupling-frequency optical MMW signal with carrier suppression
based on two parallel MZMs, where the OSSR value was about 40 dB.
Table 2 lists values of gain or RF carrier suppression
corresponding to various phase distances from 180 degrees.
TABLE I MA4IQP900M-1291 MODULATOR/DEMODULATOR TYPICAL PERFORMANCE Frequency (MHz) 850 to 960 Carrier suppression
(dBc) 39 Sideband suppression (dBc) 30 3 X I (dBc) 60 5 X I (dBc) 96 Output noise floor (dBm/Hz) -163 ACPR (dB) 68 Phase balance ([degrees]) 2.5 Amplitude balance (dB) 0.05 Package 6 mm FQFP-N 28LD M/A-COM, Lowell, MA (800) 366-2266, www.macom.com.
The LT5528's I/Q gain matching (to within [+ or -]0.1 dB) results in a typical carrier suppression
of -47 dBm at 2.15 GHz.
Chen, "Phase Factor Optimization for QPSK Signals Generated from MZM Based on Optical Carrier Suppression
," IEEE Photonics Journal, vol.
This is because the RF driving voltage deviation decreases the optical carrier suppression
Test Type Device Function Verified I/Q Phase Balance Baseband Amplifiers/Filters I/Q Magnitude Balance Baseband Amplifiers/Filters I/Q DC Offset LO On-Chip Isolation Phase Noise PLL/VCO Performance Sideband Suppression Quadrature Performance Carrier Suppression
TX DC Offset Compensation Table 1.
Accurate high-speed transmitter power, frequency, carrier suppression
and harmonic measurements can be made with the test set.
The system can enjoy a very low noise floor, low amplitude and phase errors in the balance between I and Q signals, and excellent carrier suppression
and side-band suppression from the simplification of the circuits, compared to the complicated superheterodyne transmitters.
Set the [V.sub.mod]/[f.sub.mod] to get a modulation index of 2.4 to get carrier suppression
as in method 1.