- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
Bias current and temperature dependence of polarization dynamics in spin-lasers with electrically tunable birefringence
摘要： We investigate and compare the intensity and polarization dynamics in a vertical-cavity surface-emitting laser (VCSEL) with a monolithically integrated, electrically controlled birefringence tuning mechanism. The influence of the bias current on the polarization dynamics is investigated over a large range of birefringence values. Bias current tuning toward low values and simultaneous maximization of the resonance frequency is an important strategy to optimize the spin-VCSEL toward energy-efficient operation. A polarization dynamics resonance tuning range from a few GHz up to the maximum frequency of 36 GHz was achieved, and polarization dynamics at maximum frequency are demonstrated at minimum bias current and at high temperatures of approximately 70 ○C. We propose a strategy for data communication with low energy consumption and low cooling effort.
关键词： energy-efficient operation,spin-lasers,birefringence,VCSEL,polarization dynamics
更新于2025-09-23 15:19:57
-
[IEEE 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Munich, Germany (2019.6.23-2019.6.27)] 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Polarization Organisation Hidden in the Middle Point of an Optical Fiber
摘要： Since the pioneering studies on polarization dynamics of two counter-propagating beams in nonlinear optical fibers, different processes of polarization attraction have been identified in isotropic fiber, but also in highly, weakly and randomly birefringent fibers. In this framework, the polarization attraction requires a fully polarized pump wave, which plays the role of a natural attractor for an arbitrary polarized incoming beam. Subsequently, this phenomenon has been observed using a single wave interacting with its own back-reflected wave in a feedback loop configuration. Here, we report a new configuration of polarization self-organization with two uncorrelated arbitrary polarized waves that occurs in the middle point of an optical isotropic fiber. The state of polarization (SOP) of the two counterpropagating waves evolves and fluctuates over the surface of the Poincaré sphere with a coherence time τc. During the propagation, the SOP is deeply modified by the nonlinear interaction: While the injected SOPs fluctuate all over the Poincaré spheres, the SOPs in the middle point of the fiber are attracted toward the poles of the spheres, which correspond to the circular polarization states of the fields. Then both waves recover a random state at their corresponding fiber outputs. This effect has been demonstrated experimentally considering 256 randomly distributed initial pulses in an 200-m long isotropic fiber.
关键词： coherence time,optical fibers,polarization attraction,Poincaré sphere,polarization dynamics
更新于2025-09-16 10:30:52