ClarityPlus™
Precision Frequency Standard
Full C Band Tunable Laser
The ClarityPlus is a unique instrument that serves as both afull featured C-band bench laser and a source with inherent
NIST traceable wavelength that can be used to calibrate yourother optical instrumentation. The instrument has two basic
modes: a Reference mode where the laser is locked to a built
in gas cell line (any of 50 lines) and a Wavelength/ITU mode
where the laser is set anywhere in the C-band but referenced
to a nearby gas line. The ITU mode offers live frequency
offset that allow stress testing without interruption by a locking
process.
The use of an internal H13C14N gas cell means that theaccuracy of the instrument does not degrade with time. The0.1pm absolute accuracy specification is absolute, notdepending on periodic calibration.
The laser offers external control via RS232 with a SCPI
compliant command set. For operation over USB a readily
available external convertor can be used.

Performance

Wavelength Range

1528-1567nm

C-band3

Reference Mode
Absolute Accuracy±0.1pm±0.1pm typical

Reference Lines
Other gas linesWavelength/ITU Mode
Absolute Accuracy±1pm typical

1 hour2

Allan Deviation (100 sec)

<1x10-9Reference Mode

Laser Linewidth<500 KHz typical

ITU Grid Resolution

100, 50, 25 GHz

ITU ModeLive

ITU Frequency Offset

0-50 GHz

Operating Temperature

15-45 degCSide Mode Suppression>35 dB typical

RIN<-140dB typical

Output Power

10 dBm typicalPower Stability±0.015 dB typical±0.025dB typical

Serial Interface
Power Requirements

 Primary frequency standard Traceable accuracy
 ITU grid mode with offset
 Superior power stability Narrow linewidth

Specifications1

FiberType, interface

Features

Notes

Applications
 Test bed for optical communications
 Sensing General purpose bench laser Coherent communications

1 hour
24 hours

Ordering Information (example)

PM Panda, SCAPC
RS-232, 9-pin D-Sub
socket90-250 VAC, 50/60
Hz, 0.5 amp

CLX-C

SCPI Compliant
Universal AC socket

C: C-band
L: L-band

1. Specifications reported at 25 ± 3 °C
2. Within 1 hour of initial setting
3. L-band coming, check factorysales@wavelengthreferences.com

Sample Spectrum of H13N14 Reference Lines Showing Relative Line Strength
R Branch

Wavelength(nm)P Branch26252423222120
19
18
17
1615
1413
12111098765
432
1
01527.63329(5)1528.0546(12)1528.48558(4)1528.92625(4)1529.37662(4)1529.83667(4)1530.30643(4)1530.78591(4)1531.27512(4)1531.77405(4)1532.28273(4)1532.80114(4)1533.32931(4)1533.86725(4)1534.41497(4)1534.97245(4)1535.53973(4)1536.11682(4)1536.70370(5)1537.30039(5)1537.90692(5)1538.52330(4)1539.14950(8)1539.78556(4)1540.43150(4)1541.08730(8)1541.75300(4)12345678910111213
1415
161718192021
22
23
2425
26
27

Wavelength(nm)1543.11410(4)1543.80949(17)1544.51481(4)1545.23006(4)1545.95524(4)1546.69036(4)1547.43545(23)1548.19050(4)1548.95555(4)1549.73058(4)1550.51561(4)1551.31066(4)1552.11573(5)1552.93084(4)1553.75600(5)1554.59120(5)1555.43649(5)1556.29185(5)1557.15730(5)1558.03285(12)1558.91851(5)1559.81430(5)1560.72023(5)1561.63631(4)1562.56253(5)1563.49892(5)1564.44549(5)High Accuracy Line List for Reference Mode
Expanded (2 sigma) uncertainties are stated in parenthesis and apply
to least significant digits. Uses pressure shift and uncertainty data
supplied by NIST in conjunction with a 2.4 +/- 0.5 Torr HCN
Reference Cell.

Power versus time at room temperature over 1.5 hours
showing superior power stability for applications suchas insertion loss testing. Variation over this time
±0.006dB.

Wavelength versus time for a general wavelength
anywhere in the range with ambient temperature
cycling over a 10°C range. Total drift <<1pm. The
ClarityPlus allows generation of a wavelength traceable
to NIST for any wavelength in the C-band.

sales@wavelengthreferences.com