US 2018/0024009 A1 · METHOD FOR MEASURING MULTI-CHANNEL MISMATCH OF ULTRA-HIGH SPEED PHOTONIC SAMPLER AND MEASUREMENT COMPENSATION DEVICE THEREOF

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.

Claims3

Dependent claims

1-2. (canceled)

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 mesurement 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 αk as αk=|∫+∞−∞Ek(ƒ)df|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 τ1 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 Ckk=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 201410567490.322 Oct 2014

Published

25 Jan 2018

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…

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

Life of this patent

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

Life of this patent

Abstract

Claims3