Intensity-noise suppression in microwave-photonic links using polarization modulation

Spur-free dynamic range of photonic links using polarization modulation

“…Modulation of the MCPM voltage about such a bias point creates complementary intensity modulation in the two output arms of the PBS with maximum modulation depth. This intensity modulation exhibits the same sinusoidal transfer function as a conventional MZ, as is demonstrated in earlier work [9].…”

“…Noise: Using an optical amplifier prior to the modulator results in signal-spontaneous beat noise that can be described by an additional component to the relative-intensity noise (RIN), described [9] by: (5) In determining the total mean-square noise power from RIN*, one can consider the effects of intensity-noise suppression in the balanced detector. This results in […”

“…In this paper we quantify the performance of an MWPL that uses a novel polarization-mode converter electrooptic polarization modulator (MCPM) [8] in a balanced configuration with a polarization-selective balanced receiver to cancel common-mode RIN, as first reported in [9]. Also, linearization of the modulator is performed through electronic predistortion to increase the SFDR.…”

Performance of a 40 GHz RF photonic balanced link using a polarization modulator

“…[3] Such a IMDD-BL using a PolM, a single fiber from transmitter to receiver, and the PBS preceded by a polarization controller located at the receiver has been demonstrated at 2 GHz showing common mode suppression of RIN similar to a link using a standard lithium niobate (LN) MZM. [4] In this paper we report the RF gain and NF measured over 40 GHz bandwidth and SFDR over 24 GHz of an IMDD-BL based on a PolM with the PBS integrated into the modulator package. This design requires two fibers between the transmitter and receiver, but does not require a polarization controller at the receiver as in [4].…”

Cancellation of distortions using polarization modulation in Time-Stretched Analog-to-Digital conversion

“…Since no time-delay is involved, in contrast to the dual-output push-pull MZM scheme, the PolM approach has no obvious limitations to achieving continuous-time operation. Additionally, as PolM does not require any external voltage bias, the bias-drifting problems which are commonly associated with MZMs, are not present in this scheme [4]. Thus, there is no secondary source of even-order nonlinear distortions arising from the modulator.…”