Independent Amplitude and Phase Control of Two Orthogonal Linearly Polarised Light and Its Applications

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A technique to provide independent control on the amplitude and phase of two orthogonal linearly polarised light is presented. It is based on operating a commercial dual-polarisation dual-drive Mach Zehnder modulator (DPol-DDMZM) in reverse direction that routes the input light in slow and fast axis into two different DDMZMs. The technique has the advantage of controlling the phase of the slow-axis light and the amplitude of the fast-axis light has no effect on the light travelling in the orthogonal polarisation state. It has applications in linearised microwave photonic links, frequency multipliers and microwave phase shifters. A new microwave photonic Hilbert transformer based on using the reverse operating DPol-DDMZM to alter the phase of an RF modulation sideband without affecting the orthogonally polarised optical carrier is developed. Experimental results demonstrate 24.3 dB attenuation in the fast-axis light with no change in the slow-axis light, and 0-360 RF phase shift for only 3.3 V change in DC voltage. The new Hilbert transformer with less than 2.5 phase imbalance and 0.4 dB amplitude ripples over 4-18 GHz frequency range is also demonstrated.

Original languageEnglish
Article number7200206
Pages (from-to)106
Number of pages6
JournalIEEE Photonics Journal
Issue number6
Publication statusPublished - Dec 2021


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