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BUSINESS
2x8相干混频器（8端口Single-ended PD输出）
所属分类：
Optoplex的相干混合器，由两个多偏正态的 90度光学混频器组成，一个偏振分束器和一个分束器，与现有DP-QPSK相干混合器一样，因此具有相同的光学性能。
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本页面定义了一款专门应用于客户特殊要求的8端口single-ended PD输出的相干接收机。Optoplex的相干混合器，由两个多偏正态的 90度光学混频器组成，一个偏振分束器和一个分束器，与现有DP-QPSK相干混合器一样，因此具有相同的光学性能。
图 1, Optoplex现有的2x8 DP-QPSK 相干接收机为实现所需的配置、功能和性能，现有的相干混频器设计使用了8端口single-ended PD输出用于替代8端口准直输出。
图 2, 设计的 2x8相干接收机 （ 8 single-ended PD 输出）
图 3，相干接收机原理框图（8端口 single-ended PD 输出）这 8个single-ended PD端口相互间是完全独立的– each one 每一个端口都有独立的分离接地控制，为用户提供灵活的独立监视和控制。 -
·基于 90度光学混频器的自由空间微光学。·精准的 90度相位偏差， 极小的温度波长偏振影响。·优越的光学性能 （IL, TDL, PDL, Skew,等。）·低暗电流·高CMRR·High PER
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·相干多普勒雷达系统。·相干光纤传感检测。· 在OCT以及其他生物医学传感/成像系统的相干检测。·相干光谱分析仪器·光通信的相干检测
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Parameter
Min
Typ.
Max
Unit
Conditions
Operating Wavelength Range
1525
1568
nm
C-Band
Tributary path delay
-
20
ps
Maximum skew between any path (XI, XQ, YI and YQ), Note 1
Tributary path delay variation
5
ps
Skew variation over operating conditions and aging
P/N path delay imbalance
-
2
ps
Between balanced pairs, over operating conditions and aging
Phase angle error
-5
+5
degree
Deviation from 90° angle between I and Q
Polarization extinction ratio
20
dB
To be measured over photocurrents
Optical return loss
27
dB
Each input
Responsivity of individual tributaries2
45
mA/W
Responsivity variation of individual tributaries over temperature
1.0
dB
Over operating case temperature range
P/N Responsivity imbalance3
0.85
dB
For Signal and LO path
Responsivity imbalance between tributaries 4
1.0
dB
Notes:1.Overall delay between signal input or LO input and the respective electrical output. TIA gain set to medium gain. Use a heterodyne measurement setup. Sweep the beat frequency from 0.1 – 10 GHz and derive the phase response between any path （XI, XQ, YI, and YQ）.2.This is the worst case responsivity of one individual tributary from LO or Signal input, to one of four outputs, thus including inherent and excess loss. The responsivity is to be averaged over the P and N components of each tributary. To measure the average responsivity of the Signal path, a polarization scrambled signal shall be used.3.Imbalance between P/N pair of one tributary for Signal and LO path. The imbalance is related to CMRR_DC. The definition of CMRR_DC is:
4.Imbalance between XI, XQ, YI, YQ channels, for signal and LO path. The individual tributary's P/N responsivity has to be averaged.
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