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2x8相干混頻器（8端口Single-ended PD輸出）
所屬分類：
Optoplex的相干混合器，由兩個(gè)多偏正態(tài)的 90度光學(xué)混頻器組成，一個(gè)偏振分束器和一個(gè)分束器，與現(xiàn)有DP-QPSK相干混合器一樣，因此具有相同的光學(xué)性能。
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本頁面定義了一款專門應(yīng)用于客戶特殊要求的8端口single-ended PD輸出的相干接收機(jī)。Optoplex的相干混合器，由兩個(gè)多偏正態(tài)的 90度光學(xué)混頻器組成，一個(gè)偏振分束器和一個(gè)分束器，與現(xiàn)有DP-QPSK相干混合器一樣，因此具有相同的光學(xué)性能。
圖 1, Optoplex現(xiàn)有的2x8 DP-QPSK 相干接收機(jī)為實(shí)現(xiàn)所需的配置、功能和性能，現(xiàn)有的相干混頻器設(shè)計(jì)使用了8端口single-ended PD輸出用于替代8端口準(zhǔn)直輸出。
圖 2, 設(shè)計(jì)的 2x8相干接收機(jī) （ 8 single-ended PD 輸出）
圖 3，相干接收機(jī)原理框圖（8端口 single-ended PD 輸出）這 8個(gè)single-ended PD端口相互間是完全獨(dú)立的– each one 每一個(gè)端口都有獨(dú)立的分離接地控制，為用戶提供靈活的獨(dú)立監(jiān)視和控制。 -
·基于 90度光學(xué)混頻器的自由空間微光學(xué)。·精準(zhǔn)的 90度相位偏差， 極小的溫度波長偏振影響。·優(yōu)越的光學(xué)性能 （IL, TDL, PDL, Skew,等。）·低暗電流·高CMRR·High PER
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·相干多普勒雷達(dá)系統(tǒng)。·相干光纖傳感檢測。· 在OCT以及其他生物醫(yī)學(xué)傳感/成像系統(tǒng)的相干檢測。·相干光譜分析儀器·光通信的相干檢測
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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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