Abstract
A unidirectional phase modulator consisting of tandem phase modulators is studied in detail for use as an integral part of an integrated optical isolator. The effects of non-linearity and residual amplitude modulation in the modulators, as well as the effect of the RF driving signals are captured in a phenomenological model for the first time. The model has been verified experimentally using a device realized in a generic InP based photonic integration platform and is used to study the operating range of the device. Design parameters of the modulator are derived such that modulation side bands in the forward propagating light are less than 40 dB, while isolation is maximized.
Highlights
Semiconductor lasers are very sensitive to external optical feedback (EOF) [1,2,3,4,5]
In this paper we study the properties of the unidirectional phase modulator (UPM), that is an essential part of the isolator presented in [13]
A UPM was characterized for use as part of an integrated optical isolator
Summary
Semiconductor lasers are very sensitive to external optical feedback (EOF) [1,2,3,4,5]. We predicted that 10 dB optical isolation is sufficient to stabilize the relative intensity noise of an integrated laser to within 3 dB and the linewidth and optical output power to 0.1 % for EOF up to −0.1 dB [17]. This finding indicates that it is possible to obtain a laser that is insensitive to EOF using e.g. the isolator presented in [13]. The paper is concluded by a set of requirements on the UPM that yield a side mode suppression ratio of 40 dB when the component is placed in the laser cavity
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