A 25-GHz CMOS Tunable Injection Locking Quadrature LC-Divider for Multi-Channel Transceivers

2006 ◽  
Author(s):  
Yan Hu ◽  
Rizwan Bashirullah
Keyword(s):  
Injection Locking

scholarly journals Spin Laser Local Oscillators for Homodyne Detection in Coherent Optical Communications

Micromachines ◽  
2021 ◽  
Vol 12 (5) ◽  
pp. 573
Author(s):  
Nobuhide Yokota ◽  
Hiroshi Yasaka
Keyword(s):  
Spin Polarization ◽  
Optical Communications ◽  
Injection Locking ◽  
Optical Data ◽  
Cavity Surface ◽  
Orthogonal Polarization ◽  
Linear Birefringence ◽  
Polarization Modulation ◽  
Homodyne Detection ◽  
Local Oscillators

We numerically investigate spin-controlled vertical-cavity surface-emitting lasers (spin-VCSELs) for local oscillators, which are based on an injection locking technique used in coherent optical communications. Under the spin polarization modulation of an injection-locked spin-VCSEL, frequency-shifted and phase-correlated optical sidebands are generated with an orthogonal polarization against the injection light, and one of the sidebands is resonantly enhanced due to the linear birefringence in the spin-VCSEL. We determine that the peak strength and peak frequency in the spin polarization modulation sensitivity of the injection-locked spin-VCSEL depend on detuning frequency and injection ratio conditions. As a proof of concept, 25-Gbaud and 16-ary quadrature amplitude modulation optical data signals and a pilot tone are generated, and the pilot tone is used for the injection locking of a spin-VCSEL. An orthogonally-polarized modulation sideband generated from the injection-locked spin-VCSEL is used as a frequency-shifted local oscillator (LO). We verify that the frequency-shifted LO can be used for the homodyne detection of optical data signals with no degradation. Our findings suggest a novel application of spin-VCSELs for coherent optical communications.

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