Ultrafast direct modulation of transverse-mode coupled-cavity VCSELs far beyond the relaxation oscillation frequency

2014 ◽  
Author(s):  
Hamed Dalir ◽  
Fumio Koyama
Keyword(s):  
Oscillation Frequency ◽  
Relaxation Oscillation ◽  
Transverse Mode ◽  
Direct Modulation ◽  
Coupled Cavity

scholarly journals Coupled-Cavity VCSEL with an Integrated Electro-Absorption Modulator: Small- and Large-Signal Modulation Analysis

2020 ◽  
Vol 10 (17) ◽  
pp. 6128
Author(s):  
Krassimir Panajotov ◽  
Richard Schatz
Keyword(s):  
Power Distribution ◽  
Oscillation Frequency ◽  
Relaxation Oscillation ◽  
Optical Power ◽  
Photon Density ◽  
Modulation Transfer ◽  
Signal Modulation ◽  
Large Signal ◽  
Eye Diagram ◽  
Coupled Cavity

We consider an integrated electro-absorption modulator within a coupled-cavity VCSEL structure (EAM-VCSEL). We derive expressions for the modulation transfer function (MTF) of the EAM-VCSEL for small-signal modulation of either VCSEL injection current or EAM losses. For current modulation, the cut-off frequency remains limited by relaxation oscillation frequency. For EAM loss modulation, the MTF curve is much flatter and its shape around the relaxation oscillation frequency displays either a well-pronounced maximum, both a maximum and a minimum or a sharp minimum only depending on the bias point of the EAM losses. Such features have been found experimentally in Marigo-Lombart et al., J. Physiscs: Photonics, 1, 2019, but remained unexplained hitherto. Furthermore, the cut-off frequency remains beyond 100 GHz for moderate and week coupling between the VCSEL and EAM cavities. Such ultrahigh bandwidth modulation is due to the fact that the changes of EAM impact much less the optical power distribution along the EAM-VCSEL and, consequently, the confinement factor and photon density in the VCSEL cavity. The three cases of strong, intermediate and weak coupling are also considered when carrying out the large-signal modulation response of the EAM-VCSEL and a clear open-eye diagram is demonstrated at 100 Gbs for an optimal EAM cavity length.

scholarly journals Measuring Linewidth Enhancement Factor by Relaxation Oscillation Frequency in a Laser with Optical Feedback

Sensors ◽  
2018 ◽  
Vol 18 (11) ◽  
pp. 4004 ◽  
Author(s):  
Yuxi Ruan ◽  
Bin Liu ◽  
Yanguang Yu ◽  
Jiangtao Xi ◽  
Qinghua Guo ◽  
...  
Keyword(s):  
Light Beam ◽  
Oscillation Frequency ◽  
Enhancement Factor ◽  
Optical Feedback ◽  
Relaxation Oscillation ◽  
Measurement Methods ◽  
Linewidth Enhancement Factor ◽  
Simulation And Experiment ◽  
Factor Alpha ◽  
Linewidth Enhancement

This paper presents a new method for measuring the linewidth enhancement factor (alpha factor) by the relaxation oscillation (RO) frequency of a laser with external optical feedback (EOF). A measurement formula for alpha is derived which shows the alpha can be determined by only using the RO frequencies and no need to know any other parameters related to the internal or external parameters associated to the laser. Unlike the existing EOF based alpha measurement methods which require an external target has a symmetric reciprocate movement. The proposed method only needs to move the target to be in a few different positions along the light beam. Furthermore, this method also suits for the case with alpha less than 1. Both simulation and experiment are performed to verify the proposed method.

Transverse Mode Mixing in a Coupled-Cavity VCSEL

2020 ◽  
Vol 38 (20) ◽  
pp. 5774-5782
Author(s):  
Leszek Frasunkiewicz ◽  
Krassimir Panajotov ◽  
Hugo Thienpont ◽  
Maciej Dems ◽  
Tomasz Czyszanowski
Keyword(s):  
Transverse Mode ◽  
Coupled Cavity ◽  
Mode Mixing

850 nm transverse-coupled-cavity vertical-cavity surface-emitting laser with direct modulation bandwidth of over 30 GHz

2015 ◽  
Vol 8 (8) ◽  
pp. 082702 ◽  
Author(s):  
Xiaodong Gu ◽  
Masanori Nakahama ◽  
Akihiro Matsutani ◽  
Moustafa Ahmed ◽  
Ahmed Bakry ◽  
...  
Keyword(s):  
Cavity Surface ◽  
Modulation Bandwidth ◽  
Direct Modulation ◽  
Vertical Cavity Surface ◽  
Surface Emitting Laser ◽  
Vertical Cavity ◽  
Coupled Cavity
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