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  Offset Phase Lock Servo for Vescent
¤ýÀÛ¼ºÀÚ: ÀüÀçÇÊ ¤ýÀÛ¼ºÀÏ: 2017-06-15 (¸ñ) 15:51 ¤ýÁ¶È¸: 470

D2-135 Offset Phase Lock Servo

135-side-on-view-lr

Features:

¡¤         Offset Phase Locks up to ¡Ã9.5 GHz

¡¤         Feed forward for fast frequency jumping

¡¤         Offset Frequency stability determined by external reference stability

¡¤         User-adjustable servo loop parameters

¡¤         Internal ramp generator

¡¤         Options for optical or electronic beat-note input

offset-graph-w-text-grad

Precisely control slave laser frequency offset

The D2-135 Offset Phase Lock Servo (OPLS) is designed to precisely control and quickly adjust the frequency detuning between two lasers.  The D2-135 provides for an extremely tight phase lock between the master and the slave. The D2-250 Heterodyne Module conveniently enables the overlap and fiber coupling of two laser beams. This mates with a FC fiber connector on the D2-135 providing an easy optical input for the beat note. Alternatively, the fiber connector can be exchanged with an SMA to input an electronic beat-note.  Detect the optical beat note with the D2-160 or a third-party high-speed detector.  The D2-135 OPLS provides full servo-loop customization for optimization to most lasers.

Phase Lock with OPLS

Typical Phase Lock using the D2-135 and two D2-100-DBR lasers.  Note x-axis is divided by 2 so that the actual offset is 400 MHz.

The  D2-135 can incorporate a fast photo detector to accept an optical beat note with 760 nm ¡Â ¥ë ¡Â 860 nm. The optical beat note is coupled to the detector in a multimode fiber with SC fiber connection. Alternatively, the D2-135 can be configured to accept an electrical beat note obtained from a stand-alone fast detector such as the D2-160 or third-party detectors.

The D2-135 integrates into our Rackless Rack.  As such, it may be powered with our D2-005  or from an adjacent D2 electronics module.  If used as a stand-alone product it may be powered with either a D2-005 or from a user supplied power supply via a breakout board.  View a typical configuration for using the D2-135.

General Parameters

Min

Max

Achievable Offsets

250 MHz

>9.5 GHz

Beat Note Divisors

8, 16, 32, 64

External Reference Frequency Range

30 to 240 MHz

Compared with divided down beat note

Loop Filter Transfer Function

PID

Adjustable poles & gain

Gain Range

0 to -76 dB

Loop Filter Bandwidth

10 MHz

Output Voltage

-10 V

+10 V

Feed Forward Range

¡¾5 V

D2-135-SMA electrical beat note input

Electrical Input Connector

SMA

Electrical Beat Note Input Range

-10 dBm

+10 dBm

Electrical Beat Note Input Impedance

50 ¥Ø

Achievable Offset in MHz

Internal VCO Reference (High Mode)

Offset Min

Offset Max

N=8

770

1700

N=16

1540

3400

N=32

3080

6800

N=64

6160

10000

Internal VCO Reference (Low Mode)

Offset Min

Offset Max

N=8

385

850

N=16

770

1700

N=32

1540

3400

N=64

3080

6800

External Reference: 30 – 240 MHz

Offset Min

Offset Max

N=8

240

1920

N=16

480

3840

N=32

960

7680

N=64

1920

10000