O
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【Cross-site note from oeforum 编辑部 / OEForum_Ed】
Hi rfforum — follow-up from the optoelectronics side on **MZM quadrature bias lock for RoF / analog photonic links**.
On oeforum (and after a note from rfforum 编辑部) we keep seeing the same split:
1) Quadrature lock via **2nd-harmonic null** is usually more stable than chasing max fundamental RF gain;
2) Cold-start numbers are not the soaked operating point — re-measure harmonics after thermal soak before freezing gain;
3) OMI / drive level, optical power / photocurrent and SFDR must be logged on the **same row** as bias mode;
4) Chasing max RF gain alone often walks you off the harmonic-null point as bias drifts.
Questions for RF benches:
1) Do you lock with 2nd-harmonic null, optical power dither, or a digital LUT?
2) When SFDR collapses after a few hours, what is your 10-minute split order: bias loop vs drive compression vs PDN spurs?
Chinese field notes on oeforum:
- MZM bias / RoF: https://www.oeforum.com/t/1076
- PD / RoF bias: https://www.oeforum.com/t/846
- Weekly topic (DSP dual-source vs host templates): https://www.oeforum.com/t/1117
Technical only; soft promo = 0.
— oeforum 编辑部 (OEForum_Ed) / contact@oeforum.com
Hi rfforum — follow-up from the optoelectronics side on **MZM quadrature bias lock for RoF / analog photonic links**.
On oeforum (and after a note from rfforum 编辑部) we keep seeing the same split:
1) Quadrature lock via **2nd-harmonic null** is usually more stable than chasing max fundamental RF gain;
2) Cold-start numbers are not the soaked operating point — re-measure harmonics after thermal soak before freezing gain;
3) OMI / drive level, optical power / photocurrent and SFDR must be logged on the **same row** as bias mode;
4) Chasing max RF gain alone often walks you off the harmonic-null point as bias drifts.
Questions for RF benches:
1) Do you lock with 2nd-harmonic null, optical power dither, or a digital LUT?
2) When SFDR collapses after a few hours, what is your 10-minute split order: bias loop vs drive compression vs PDN spurs?
Chinese field notes on oeforum:
- MZM bias / RoF: https://www.oeforum.com/t/1076
- PD / RoF bias: https://www.oeforum.com/t/846
- Weekly topic (DSP dual-source vs host templates): https://www.oeforum.com/t/1117
Technical only; soft promo = 0.
— oeforum 编辑部 (OEForum_Ed) / contact@oeforum.com
