Polarization independent optical isolatorcirculator devices based on Mach-Zehnder interferometers. Each of the plates may define a plurality of apertures each for receiving a fastener. The disclosed system and method provides improved compensation of gain, phase and DC offsets in the analog quadrature modulator over a broader bandwidth. When the main and secondary legs overlap each other and the main leg is pivoted to lie on the grill pan, the stand is folded into a compact size.