1. In order to prevent reflection-induced distortion, the laser must be connected to an optical cable having a return loss of at least 55 dB for discrete
reflections and 30 dB for distributed reflections.
EMCORE CORPORATION
2
Model 755MM-M Optical Transmitter
PRELIMINARY DATASHEET| OCTOBER 3, 2007
RF Characteristics
1
Parameter
Frequency Response Flatness
Input Impedance
C/I (3
rd
order)
52
75Ω Test Port Response Flatness
RF Test Point Level
75Ω Input RF Level
50Ω Input RF Level
75Ω CATV Video Input Return Loss
75Ω CATV Test Port Input Return Loss
50Ω L-band Input Return Loss
1.
Condition
75Ω input, 47 - 1002 MHz
50Ω input, 950 - 2600 MHz
CATV, 47 – 1002 MHz RF Input
L-Band, 950 – 2600 MHz RF Input
50Ω RF Input
Relative to 75Ω input
With –2.0 dBm total RF power into
75Ω input
79-channel loading, composite
Composite
47 to 1002 MHz
47 to 870 MHz
870 to 1002 MHz
950 to 2600 MHz
Min
-
-
-
-
-
-1
-20.5
-2.2
-0.5
16
16
14
10
Typ
-
-
75
50
-
-
-
-2.0
0.0
-
-
-
-
Max
1.5
3.5
-
-
-60
+1
-19.5
-1.8
+0.5
-
-
-
-
Unit
dB
p-p
Ohms
dBc
dB
dBm
dBm
dBm
dB
dB
dB
25°C ambient operation. Test receiver responsivity > 0.95 A/W at 1550 nm and equivalent noise current of 7 pA/√Hz. SMF-28 fiber, 0.25 dB/km
maximum loss, 1312 nm + 3 nm zero dispersion wavelength.
5.2.
Two –3 dBm/tone carriers, f
i
= 2000 MHz, f
2
= 2000.5 MHz, 50Ω input.
Channel Loading
RF Input
Level per
Channel
(dBmV)
27.83
27.83 (analog)
21.83 (QAM)
26.34
30.52
28.97
Composite
RF Input
Level (dBmV)
46.75
47.68
46.75
46.75
46.75
Composite
RF Input
Level (dBm)
-2.0
-1.066
-2.0
-2.0
-2.0
CNR
1,2,3
(dB)
51.0
49.0
48.5
52.0
52.0
CSO
1,3,4
(dBc)
-60
-60
-60
-60
-60
CTB
1,3,4
(dBc)
-65
-65
-65
-65
-65
BER
5
79 Channel NTSC
79 Channel NTSC + 75
Channel QAM-256 @ -6 dB
110 Channel NTSC
42 Channel CENELEC
60 Channel PAL
1.
2.
3.
4.
5.
-
10
-7
-
-
-
10 km transmitter option is tested through 0 km and 10 km SMF-28 fiber. 20 km transmitter option is tested through 0 km and 20 km SMF-28
fiber.
CNR may degrade up to 0.5 dB over the operating temperature range.
0 dBm optical power received.
CSO and CTB may degrade up to 1.5 dB over the operating temperature range.
据外媒报道，德国亥姆霍兹研究中心联合会（Helmholtz Association of German Research Centres，HZB）团队采用非破坏性方法，首次研究了采用稀电解液的实用锂硫软包电池。借助原位中子层析成像技术，他们能够实时可视化充电和放电过程中电解液在多层电极上的分布和润湿情况。 图片来源： HZB 相关研究论文已发表于期刊《先进能源材料（Advanced E...[详细]
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