Profile: Photonic Systems, Inc. provides microwave photonics research, engineering services and products. PSI has designed and developed fiber-optic systems that include lasers, external modulators, driver amplifiers, bias control, linearization techniques, doped-fiber or semiconductor optical amplifiers, optical filters, high sensitivity receivers, temperature control, wideband power amplifiers, noise compensation circuits and adaptive load compensators. Our PSI 0204-11 chip scale optical modulator bias controller (MBC) offers control of external optical modulators from a single, small form factor circuit board. When operated with lithium niobate (LiNbO3) modulators, the PSI-0204-11 provides automatic or manual bias control.