DPO7OE 系列光探頭可以作為高速串行數(shù)據(jù)信號(hào)的光基準(zhǔn)接收機(jī) (ORR)（使用可選的 Bessel-Thomson ORR 濾波器），也可以作為傳統(tǒng)光電轉(zhuǎn)換器，用于光帶寬光信號(hào)采集。DPO7OE 系列可以兼容 DPO/MSO70000 C/DX/SX 示波器。連接到 TekConnect 通道，實(shí)現(xiàn)高達(dá) 33 GHz 的電帶寬。在連接到 ATI 通道時(shí)，DPO7OE1 提供達(dá) 42 GHz 電響應(yīng)，DPO7OE2 提供達(dá) 59 GHz 電帶寬響應(yīng)。

功能及優(yōu)勢(shì)

• 精確的光基準(zhǔn)接收機(jī) (ORR) 濾波器，支持 25GBd、26GBd、28GBd 和 53GBd 光網(wǎng)絡(luò)標(biāo)準(zhǔn)，保證的測(cè)量精度和相關(guān)度

• 多功能設(shè)計(jì)在多條通道上提供了高達(dá) 59GHz 的 Bessel-Thompson ORR 規(guī)定帶寬或未濾波響應(yīng)

• 寬波長(zhǎng)，F(xiàn)C/PC 或 FC/APC 連接器選項(xiàng)

• 高靈敏度和低噪聲，為高速信號(hào)分析提供了 SNR

• 深入分析 PAM4 和 PAM2 (NRZ) 信令、均衡和錯(cuò)誤檢測(cè)/隔離

• 兼容 ATI 和 TekConnect® 通道，實(shí)現(xiàn)的性能或通道密度

應(yīng)用

• 數(shù)據(jù)中心網(wǎng)絡(luò)設(shè)備設(shè)計(jì)驗(yàn)證

• 研究 – 表征基于激光器的測(cè)速系統(tǒng)（如 PDV、BLR）及其他光現(xiàn)象

• 使用實(shí)時(shí)示波器的調(diào)試功能對(duì)光接口系統(tǒng)進(jìn)行調(diào)試

光基準(zhǔn)接收機(jī)性能

實(shí)現(xiàn)光基準(zhǔn)接收機(jī) (ORR) 響應(yīng)要求充足的儀器帶寬，確保超過(guò)數(shù)據(jù)速率時(shí)實(shí)現(xiàn)平滑的頻率滾降特點(diǎn)。在設(shè)計(jì)數(shù)據(jù)中心網(wǎng)絡(luò)設(shè)備時(shí)，一般會(huì)使用四階 (BT4) 頻響的 ORR。對(duì) NRZ(PAM2)，基準(zhǔn)接收機(jī)的 ?3dB 電帶寬設(shè)置成頻率是光符號(hào)速率的 75%，其帶寬極限保護(hù)頻段設(shè)置成頻率為光符號(hào)速率的 150%。對(duì) 28GBd 光信號(hào)使用這些值可以得到下面的頻響要求：

對(duì) PAM4 信號(hào)，要調(diào)低 BT4 濾波器。電帶寬設(shè)置成與符號(hào)速率的 50% 對(duì)應(yīng)的頻率。DPO7OE 系列中還提供了 ORRBT4 濾波，支持 PAM4 標(biāo)準(zhǔn)中的各種重要符號(hào)速率，如 53.152GBd 和 26.5625GBd。

通過(guò)在高帶寬 ATI 通道上采集信號(hào)，可在該通道的通帶中保持線性相位。這使得可在 DPO7OE1 上啟用波特率高達(dá) 28Gbd 的真正光學(xué)基準(zhǔn)接收機(jī) (ORR) 質(zhì)量濾波器，DPO7OE2 需要高達(dá) 42GHz 的受控電氣響應(yīng)，和高達(dá) 53GBps 的 PAM4 波特率。下圖顯示了 DPO77002SX 實(shí)時(shí)示波器上的 DPO7OE1 的典型頻響。

The DPO7OE series of optical probes can be used as an optical reference receiver (ORR) for high-speed serial data signals (using the optional bessel-thomson ORR filter) or as a traditional photoelectric converter for optical bandwidth optical signal acquisition. DPO7OE series can be compatible with DPO/MSO70000 C/DX/SX oscilloscope. Connect to the TekConnect channel to achieve up to 33 GHz electrical bandwidth. When connected to ATI channel, DPO7OE1 provides up to 42 GHz electrical response, and DPO7OE2 provides up to 59 GHz electrical bandwidth response.

Functions and advantages

The precise optical reference receiver (ORR) filter supports 25GBd, 26GBd, 28GBd and 53GBd optical network standards to ensure the highest measurement accuracy and correlation

The multifunction design provides up to 59GHz bessel-thompson ORR specified bandwidth or unfiltered response on multiple channels

Wide wavelength, FC/PC or FC/APC connector options

High sensitivity and low noise provide the best SNR for high speed signal analysis

In - depth analysis of PAM4 and PAM2 (NRZ) signaling, equalization, and error detection/isolation

Compatible with ATI and TekConnect ® channel, to achieve maximum performance or channel density

application

Data center network equipment design verification

Research - characterizing laser based velocity measurement systems (e.g. PDV, BLR) and other optical phenomena

Debugging the optical interface system with the unique debugging function of the real-time oscilloscope

Optical reference receiver performance

The implementation of the optical reference receiver (ORR) response requires adequate instrument bandwidth to ensure smooth frequency rolling characteristics over the data rate. Fourth order (BT4) frequency response ORR is commonly used when designing data center network equipment. For NRZ(PAM2), the 3dB electrical bandwidth of the reference receiver is set to 75% of the optical symbol rate, and the bandwidth limit protection frequency is set to 150% of the optical symbol rate. The following frequency response requirements can be obtained by using these values for 28GBd optical signals:

Optical reference receiver attenuation frequency

-3 dB 0.75 * 28 G = 21 GHz

Nominal value: -13.4 dB

Range: -9.4 ~ -17.4 dB 1.50 * 28 G = 42 GHz

For PAM4 signal, lower BT4 filter. The electrical bandwidth is set to the frequency corresponding to 50% of the symbol rate. The DPO7OE series also provides ORRBT4 filtering, which supports important symbol rates in PAM4 standards such as 53.152GBd and 26.5625GBd.

By collecting signals on the high-bandwidth ATI channel, the linear phase can be maintained in the passbａnd of the channel. This enables a true optical reference receiver (ORR) quality filter with a baud rate of up to 28Gbd to be enabled on DPO7OE1, which requires a controlled electrical response of up to 42GHz and a PAM4 baud rate of up to 53GBps. The figure below shows the typical frequency response of DPO7OE1 on a DPO77002SX real-time oscilloscope.