D2 Offset Phase Lock Servo

D2-135

controller

Offset Phase Locks from 250 MHz to 9.3 GHz
Precisely control follower laser frequency while remaining referenced to the primary standard
User-adjustable servo parameters
Internal ramp generator
Fast frequency jumps with feed-forward
Offset frequency stability determined by reference stability

Made in the USA

The D2-135 Offset Phase Lock Servo (OPLS) is designed to precisely control and quickly adjust the frequency detuning between a master and a follower laser. The D2-135 forms a complete offset lock system when combined with the D2-250 Heterodyne Module and D2-260 Beat Note Detector. The D2-250 overlaps the free-space master & follower lasers to generate the optical beat note. It then couples the beat note into a fiber for delivery to the D2-260, where it is down-converted to the RF and then delivered to the D2-135 to be servoed.

Input/Output

Parameter	Value	Units
Offset Frequency Range	0.250 to >9.3	GHz
Beat-Note Input Connection	SMA
Beat-Note Input Range	-10 to 10	dBm
Min Electronic Beat-Note S/N	>50	dB
Input/Output Impedance	50	Ω
Servo Output Range	±10	V

Frequency Reference

Parameter	Value	Units
Source	Internal VCO or External input
Reference Signal Range	30 to 240 MHz
VCO drift	200	ppm/°C
PFD Noise	-213	dBc/Hz
External Reference Input Power	-10 to +10	dBm

Loop Filter

Parameter	Value	Units
Proportional Gain Dynamic Range	76	dB
ƒ_I (Integral/Prop. corner)	4,8,16,32,64,125,250,500	kHz
ƒ_D (Proportional/diff. corner)	16,32,64,125,250,500,1000,off	kHz
ƒ_HF (high freq. cutoff pole)	0.25, 0.5,1,2,4,8,16,off	MHz