US 10,209,135 B2Granted

Method for measuring multi-channel mismatch of ultra-high speed photonic sampler and measurement compensation device thereof

AssigneeShanghai Jiao Tong University

InventorsWeiwen Zou, Guang Yang, Huajie Zhang, Jianping Chen

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Abstract

The present invention relates to a measuring and compensating method for channel mismatch of an ultra-high speed time-wavelength interleaved optical pulse sequence, by employing a generating module of the to-be tested ultra-high speed time-wavelength interleaved optical pulse sequence, an optical spectrum measuring module, an electrical frequency measuring module, and a data analyzing and processing module. The present invention obtains mismatch information of the pulse sequence for each channel by means of measurement and analysis of the ultra-high speed time-wavelength interleaved optical pulse sequence, thus overcoming the bottleneck of inadequate sampling of time-domain observation via an oscilloscope. The channel mismatch information obtained by the present invention may act as a basis for channel mismatch compensation and correction for the ultra-high speed time-wavelength interleaved optical pulse sequence.

Claims2

Dependent claims

A method for measuring multi-channel mismatch of an ultra-high speed photonic sampler, comprising

splitting a multi-channel optical pulse signal sequence to be tested into a first path of the signal sequence and a second path of the signal sequence by a 1×2 optical fiber coupler,
inputting the first path of the signal sequence into a spectrometer to obtain a first measurement result,
passing the second path of the signal sequence through a photodetector and inputting the second path of the signal sequence into an electrical spectrum analyzer to obtain a second measurement result,
outputting the first measurement result from the spectrometer and the second measurement result from the electrical spectrum analyzer respectively to a data analyzing and processing module,
calculating an amplitude ak as ak=|∫−∞+∞Ek(ƒ)dƒ|2, wherein k equals to 1, 2, . . . , M, of each channel, M is a total number of all the channels, and Ek(ƒ) is an optical spectrum as measured by the spectrometer for the kth channel,
calculating ũk(ƒ) as
u
~
k
⁡
(
f
)
=

E
k
⁡
(
f
)

2
max
⁢
{

E
k
⁡
(
f
)

2
}
as a Fourier transformation of uk(t), wherein the uk(t) is a normalized waveform of the kth channel, and
calculating a time delay τk as
{
10
⁢
⁢
log
10
⁢
P
M
⁡
(
τ
1
,
τ
2
,
…
⁢
,
τ
M
)
P
k
⁡
(
τ
1
,
τ
2
,
…
⁢
,
τ
M
)
=
C
M
-
C
k
,
k
=
1
,
2
,
…
⁢
,
M
-
1
τ
1
=
0
wherein Ck, k=1, 2, . . . , M are M spectrum peaks measured by the electrical spectrum analyzer, and Pk are M peaks of a radio frequency spectrum on an interval [0, ƒs]:
P
k
=
(
R
PD
MT
s
)
2
⁢

∑
l
=
1
M
⁢
⁢
a
l
⁢
u
~
l
⁡
(
kf
s
/
M
)
⁢
e
-
j
⁢
⁢
2
⁢
⁢
π
⁡
(
kf
s
/
M
)
⁢
⁢
τ
l
⁢
⁢
e
-
j
⁢
⁢
2
⁢
⁢
π
⁢
⁢
k
⁡
(
l
-
1
)
/
M

2
k
=
1
,
2
,
…
⁢
,
M
wherein Ts is a sampling period, ƒs=1/Ts, and RPD is a responsivity of the photodetector.

186 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/544,188Filed 30 Oct 2014
Priority: CN 2014 1 056749022 Oct 2014
Published: US 2018/0024009 A125 Jan 2018
Granted: 19 Feb 2019
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

G01J 11/00
Measuring the characteristics of individual optical pulses or of optical pulse trains
G01J 1/58
Photometry, e.g. photographic exposure meter: using luminescence generated by light
G01J 3/28
Spectrometry; Spectrophotometry; Monochromators; Measuring colours: investigating the spectrum
G01R 27/28
Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom: measuring attenuation, gain, phase…