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實現了低損耗、低耗電、可依系統需求做出適當調配的傳輸設備。

■ 電-光轉換器 (TX) 　   型號 波長 放射性 電纜等化器 時鐘恢復器 EO-100B 1310nm -3.5dBm 有 有 EO-140★ 無 無 EO-160★ 有 無   ★表示訂製品   插入口: 1孔 體積: 17×43.4×78.4mm 重量: 77g               ■ CWDM用電光轉換器   型號 波長 放射性 電纜等化器 時鐘恢復器 EO-100A-** 1271 - 1611nm -2.5dBm 有 有   ** 煩請詳見下表完整規格型號       插入口: 1孔 體積: 17×43.4×79.2mm 重量: 58g 前部面板顏色為淺灰色，附防塵蓋 　           ■ 光-電轉換器 (RX)   型號 波長 放射性 時鐘恢復器 OE-101B 1200 - 1620nm -24dB 有 OE-151★ 無   ★ 表示訂製品   插入口: 1孔 體積: 17×43.4×78.4mm 重量: 77g       主要的性能及優點：   能夠對應多種訊號規格，HD-SDI(提升至1.485Gbps)，SD-SDI及DVB-ASI 可支援載入音訊傳輸 可通過病理性測試信號(pathological signal)的檢測 未附有時鐘恢復器的機種，也可傳送HD-SDI以外的信號(傳送速度50Mbps至1.5Gbps) 設計簡潔，在1U的機箱內可以安裝多達16個模組 支援熱插拔 符合成本效率 使用方便，只需插入BNC和光連接接頭   備註： 不含等化器模組的產品僅在當系統中的同軸電纜發生短路故障時使用，並且可以進一步的降低成本。       ■ HD-SDI 傳送場合的系統參考 　 * 條件: line loss 0.5dB/km 　       型號 特性 EO-700★ NTSC / PAL 電轉光 OE-701★ NTSC / PAL 光轉電   ★ 表示訂製品         支援NTSC及PAL兩種視訊信號。 支援傳送Tri-Level Sync同步訊號。 有效延長傳輸訊號距離，最大可達45KM。 (條件: line loss 0.5dB/km)       產品規格 型號 EO-700 OE-701 功能 電轉光 光轉電 波長 1310nm 1200 to 1620nm 發光範圍 / 最小受光範圍 -3.5dBm -26dBm 類比視訊輸入 / 輸出接頭 1x75ΩBNC / 輸入 1x75ΩBNC / 輸出 光纖接頭 1xSC (單模) 訊噪比 ( S / N ) 60dB 頻寬 6MHz 規範 SMPTE 170M, ITU-R BT.470, CB, CE UL / cUL, FCC Part 15 ClassA, FDA, RoHS

Wavelength Multiplexing Systems

■ Multiplexing
　

“Multiplexing” is a technology that allows multiple signals with different
wavelengths to be transmitted together over a single optical fiber. Three
general types of multiplexing — WDM, CWDM and DWDM — offer increasing
signal-carrying capacites, as described below.
　

Wavelength Division Multiplexing (WDM)
WDM is the simplest form of multiplexing and uses two wavelengths of
1310nm and 1551nm. Unlike when using and potical divider, insertion loss
can be kept below 0.5dB.
　

Coarse Wavelength Division Multiplexing (CWDM)
CWDM systems use 8 wavelengths (20nm grid) primarily between 1471nm
and 1611nm. To these it is also possible to add 8 more between 1271nm
and 1451nm to allow a maximum of 16 wavelengths to be carried as a
single multiplexed transmission. An ultra-thin membrane filter on the optical
multiplexer/demultiplexer (mux/demux) keeps insertion loss at just 2-3dB.
*CWDM standardized through ITU G695.

■ Optical Converter (TX for CWDM)

Canare’s CWDM optical converter uses a DFB laser, which offers a much
tighter spectrum than FP lasers. Up to 16 different wavelengths fall within
1271nm and 1611 nm in 20nm
intervals. The wavelengths in the
20nm grid between 1391nm and
1411nm are not used because their
proximity to the water peak results in
too much attenuation.

■ Optical Multiplexer/Demultiplexers

The optical signals output from the optical converter (TX) are combined into a
single signal by the multiplexer (mux) and transmitted along a single optical
fiber. At the receiving end, these combined optical signals are demultiplexed
(demux) to split them back into their original component 8 signals.
Optical mux/demuxers are bi-directional, so the same model can be used
for transmitting and receiving on each end. It’s also possible to use 4
wavelengths out of the 8 for transmitting and the remaining four for receiving.
Both 8-wavelength and 16-wavelength models are available, and combining
these with an optical converter allows a variety of system contructions with
many uses.

■ Optical Converter (RX)
Canare’s optical converter (RX) converts a light signal comprised of 8
different wavelengths into electrical signals. This converter is common to all
wavelengths and one converter is required for each wavelength.