Wavelength Locking of Microring Resonators and Modulators using a Dithering Signal

Padmaraju, Kishore; Logan, Dylan F.; Ackert, Jason J.; Knights, Andrew P.; Bergman, Keren

doi:10.1049/cp.2013.1571

Cited by 3 publications

(2 citation statements)

References 7 publications

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“…Solutions from the second category rely on some kind of feedback information, reflecting the state of the MRR's OTF, which is then processed by the control system, acting on the tuning mechanism, e.g., the integrated heaters. The feedback information can be extracted in a few different ways, i.e., either by directly sensing the local temperature of the PIC [25], by monitoring the optical power at the drop port [26][27][28][29][30] or, less conveniently, tapping it from the through port [31], or even analyzing the BER [32] resulting from the instantaneous alignment of the OTF. While the latter metric reflects the transmitter's performance most relevantly in telecommunication terms, it requires a complex, high-speed monitoring and control system.…”

Section: Introductionmentioning

confidence: 99%

“…With the feedback signal sorted, a variety of mechanisms for tuning the OTF accordingly has been proposed and demonstrated. Some are employing integrated resistive heaters [26,27,33], then others indirectly control the temperature by adjusting the bias current of the diode junction [31,34] (applicable to carrier injection micro-ring modulators) and then there are also some solutions that rely on the EO effect [35,36].…”

Section: Introductionmentioning

confidence: 99%

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Analog Wavelength Locking in an Optical Single-Sideband Transmitter of a Millimeter-Wave Radio-Over-Fiber Link Featuring a Micro-Ring Resonator and a Heat-Pump-Controlled Laser

Vuk Baliž,

Debevc,

Vidmar

et al. 2023

Photonics

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This paper presents a novel approach to addressing the issue of temperature-induced instability in an optical, single-sideband transmitter based on a micro-ring resonator (MRR) suitable for millimeter-wave (mmW) radio-over-fiber (RoF) communications. We propose utilizing the drop port of the MRR to provide a feedback signal to the closed-loop control (CLC) system. The latter serves to maintain the optimal alignment between the laser’s carrier and the MRR’s resonant wavelength, thus mitigating the adverse effects of chromatic-dispersion-induced power fading at the receiving end. Since the feedback information is extracted from the otherwise-wasted resonant energy at the drop port, the control system does not compromise the delicate optical signal at the through port. A CLC was synthesized, designed, and prototyped to provide real-time wavelength tuning of the heat-pump-controlled laser based on the feedback signal. Experimental evaluations demonstrate that the wavelength of the laser could be successfully locked to the MRR’s resonance with a wavelength dither of less than 0.004 nm (~491 MHz). This allowed us to limit the power-penalty deterioration to less than 2 dB for a RoF link with a 2.5-km standard telecommunication single-mode fiber (SMF), a modulation frequency of 37.8 GHz, and a carrier wavelength of 1563.97 nm (~191.820 THz). The proposed solution offers an alternative approach for the carrier and the MRR’s resonant wavelength interlocking without the need for complex photonics like thermo-optic or electro-optic structures to control the temperature or phase velocity, respectively.

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