消光比メータ

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ERM100の使用例

偏波保持(PM)ファイバの消光比(ER)測定
PMファイバのコネクターキーへのアライメント
PMファイバのレーザ光源へのアライメント

ERM100は、回転偏光子法を用いた消光比メータです。このベンチトップ型装置は、高速かつ簡単に偏波保持(PM)ファイバの消光比を測定します。この装置はPMファイバのアライメントが必要となる多くの用途で利用できます。

動作原理
消光比メータERM100は、光電流を発生させるディテクタとその前に位置する回転偏光子から構成されています。一般的に、この光電流はDCオフセットを有する正弦波となります。DCオフセットと変調の深さを同時に解析することにより、光の直線偏光の程度を決定し、消光比を求めています。

利点
このベンチトップ型の測定装置は、あらゆる種類のPMファイバのアライメント用途に適しています。フロントパネルの一連のボタンとLCDによって、調整と測定を素早く行なうことができます。多くのPMファイバのアライメントを効率的に実行することができます。

ERM100は工場で校正されており、ER、ミスアライメント角度、およびパワーを測定できます。この消光比メータはUSB接続を介したコンピュータ制御も可能で、LabVIEW™、LabWindows™/CVI™、MSVC、およびBorland C用のドライバが付属しています。

ERM100にはFC/PCコネクタが装備されています。他の種類のコネクタに関しては、当社までお問い合わせください。

発送
各ユニットは、本体、USBケーブル、LabVIEW™およびLabWINDOWS™CVIドライバーセット付きソフトウェアCD、およびマニュアルと一緒に発送されます。

使用例：PMアライメント

消光比メータERM100は、PMファイバの軸をアライメントするためにお使いいただけます。直線偏光を維持するため、PMファイバの入射光は直線偏光である必要があり、ファイバの主軸のひとつに対して平行に入射する必要があります。ERM100はこれを実行するのに便利です。このようなファイバーアライメントには、光源の種類に応じて、2種類の一般的なセットアップがあります。

広帯域光源 (SLED)
これら光源の波長に依存する複屈折のため、最大消光比を有する最適な角度を見つけるには、偏波面の結合角度のみを変える必要があります。

狭帯域光源 (半導体レーザ)
狭帯域光源では、波長に依存する複屈折はほとんどありません。PMファイバの信頼できる消光比を得るには、偏光状態のファスト軸とスロー軸の間の位相シフトを全て解析する必要があります。この解析は結合角度を調節しながら測定中にファイバに応力を加える(応力によって誘発された複屈折)ことによって行ないます。最適な角度を得るために、最大消光比は安定かつファイバにかけた応力に依存しないことが必要です。

一般的な使用例

直線偏光された光のPMファイバへの最適な入射
コネクターキーへの最適なアライメント
ピグテール (半導体レーザのPMファイバへのアライメント)

狭帯域光源でのER測定

PM Fiber Alignment

ERM100 Specifications^a
Wavelength Range	800 - 1700 nm
Max. ER^b	＞40 dB
ER Accuracy^b	0.5 dB
ER Resolution	0.1 dB
Angle Accuracy^b	0.5°
Angle Resolution	0.1°
Dynamic Range^c	-40 to 10 dBm
Operating Temperature	5 to 40 °C
Line Voltage	100 V, 115 V, 230 V +15%/-10%

仕様はすべて23 ± 5°Cで相対湿度 45 ± 15% での値です。
入力パワー＞-30 dBm
ダイナミックレンジは、波長に依存します。

ERM100シリーズ消光比メータ用ソフトウェア:

ソフトウェアは次のカテゴリに分類されています。

アプリケーション:標準アプリケーションソフトウエアパッケージとグラフィカルユーザーインターフェース(GUI)
ドライバ: National Instruments™、LabWindows™/CVI、LabVIEW™の開発環境用の機器用ドライバ
ファームウェア: 装置の内部操作用の低レベルソフトウエア
ユーティリティ: 汎用ソフトウェアツール

Posted Comments:

Andrew Robertson (posted 2020-07-08 10:34:51.043)

I've got an ERM100 with an FC/PC connector, if I connect with a patch cord with FC/APC - will the measurement PER reading make any sense or is it completely unusable? Will it effect the angle measurement?

dpossin (posted 2020-07-08 11:13:45.0)

Dear Andrew, Thank you for your feedback. Basically the ERM100 is just a rotating polarizer and a photodiode behind. Because the efficiency of the polarizer is angle dependent, the PER will be slightly under or overestimated by using an FC/APC connector together with ERM100 with FC/PC connection.

Robbie Murray (posted 2020-07-01 10:40:41.2)

Hi. The ERM100 is a great product, and now an invaluable tool in our lab. I have a couple of questions though: 1) Is it OK to use FC/APC connectors, even though we have the FC/PC option? 2) I have been trying to measure the PER of the output of a fibre amplifier (keeping the power below 10 dB at all times). Above a certain input power level (approx -6 dBm), the PER monitor stops providing a PER reading and gives the input power to low. However, there is definitely enough power entering the PER meter. What state of input polarisation (i.e. unpolarized, certain level of DOP etc) would give this input error, even though there is power entering the device. I suspect that the increasing power from the fibre amplifier is causing depolarization of the signal, how would this affect the PER meter. Many thanks

dpossin (posted 2020-07-06 04:22:28.0)

Dear Robert, Thank you for your feedback and for sharing your positive impressions about the ERM100. We really appreciate that. Basically the ERM100 is just a rotating polarizer and a photodiode behind. Because the efficiency of the polarizer is angle dependent, the PER will be slightly under or overestimated by using an FC/APC connector together with ERM100 with FC/PC connection. I am reaching out to you in order to discuss your second question.

Marcus Duelk (posted 2020-02-13 14:04:49.237)

Hello, We have been using several of the ERM100 units over the past years. They have been working great for us. But, we would like to have something similar also for the visible range, like 400-800nm. Could you offer a variant of the ERM100 that is tailored to the visible range ? I am sure it will be mainly a matter of using a different polarization filter and a different photodetector inside, the architecture itself and the firmware could probably remain the same ... Thanking in advance. Best regards, Marcus Duelk

MKiess (posted 2020-03-05 06:14:40.0)

This is a response from Michael at Thorlabs. Thank you for the inquiry. We have the possibility to build some special designs here. However, due to the required optics it could become more difficult to cover the complete desired wavelength range without restrictions. Depending on your application, our PAX1000VIS Polarimeter, would also be a good alternative. I have contacted you directly to discuss the details with you.

srikanth (posted 2017-10-22 23:37:58.18)

May I know dynamic range of ERM-100 in the wavelength range of 1000-1100nm? Will ERM-100 works with line supply in India (~230V, 50Hz). -srikanth

swick (posted 2017-11-06 03:32:56.0)

This is a response from Sebastian at Thorlabs. Thank you for the inquiry. The dynamic range at 1000-1100nm will be slightly shifted but still at approx. -40 dBm to 10 dBm. The ERM100 will work with line voltage 230V (50Hz). We have contacted you directly for further assistance.

pskochinski (posted 2017-09-11 09:11:11.84)

What is the minimum input optical power required to achieve a PER measurement of 30dB or 40dB?

swick (posted 2017-09-14 04:41:24.0)

This is a response from Sebastian at Thorlabs. Thank you for the inquiry. For measuring PER of 40dB the optical input power should be > -30dBm. For PER of 30dB the power should be approx. > -33dBm to -35dBm The exact power level limitation is dependent on noise and wavelength. I will contact you directly to provide further assistance.

user (posted 2016-01-14 17:29:28.627)

How do you change the time stamp on ERM-100 software app to match with the time on the connected PC? Thank you.

shallwig (posted 2016-01-15 10:52:15.0)

This is a response from Stefan at Thorlabs. Thank you very much for your inquiry. In the software GUI of the ERM100 it is not possible to modify the time stamp. The software package also contains drivers for programming in Labview. Here it should be possible to implement the time from the connected PC into your measurement. As you left no contact data please contact me at euorpe@thorlabs.com for further question.

ddewitte (posted 2014-09-19 11:41:18.887)

What fiber connectors are available for this unit? Also would it be possible to make the connectors swappable? Do you have an ER meter for visible wavelengths (400 - 800nm)? Thank you, ~Daniel DeWitte

shallwig (posted 2014-09-22 04:09:47.0)

This is a response from Stefan at Thorlabs. Thank you very much for your inquiry. We can offer this extinction ratio meter with FC/PC and FC/APC connectors, the connectors are not swappable. At the moment we have the ERM100 with a specified wavelength range from 800 -1700nm and we can offer a special version for the wavelengths range 600-1000nm. We are still working on an ER meter for the visible range. I will contact you directly to discuss your application in detail.

tcohen (posted 2012-02-21 11:24:00.0)

Response from Tim at Thorlabs: Thank you for your feedback. We are able to offer a custom ERM100 with higher attenuation in the collimator such that you can use it at +20dBm. We have contacted you directly with more information.

stephen_yeh (posted 2012-02-20 10:16:28.0)

Hello, ERM100's spec says max. power range is +10dBm. Can it make +20dBm at 1550nm? or have to use attenuator together? thanks

apalmentieri (posted 2010-01-21 08:44:59.0)

A response from Adam at Thorlabs to Aditya: The warranty on the ERM100 is 2 years.

aditya.suresh (posted 2010-01-20 20:30:59.0)

Can you please let me know if there is a manufaturers warranty etc for this product?

Laurie (posted 2009-02-24 08:24:17.0)

Response from Laurie at Thorlabs to anton: Thank you for your interest in our products and your feedback. Currently, Thorlabs does not offer any splicing equipment. However, if desired, our ERM100 can be used to monitor the polarization after splicing is completed. Many third party splicers have built-in monitoring systems that keep track of the light intensity profiles of the light from each fiber splice. Someone from our technical support staff will be contacting you directly to provide a bit more information on these third-party splicers.

anton (posted 2009-02-10 09:03:32.0)

I need to splice two PM fibers with polarization extinction ratio above 37 dB. Can I use this device for this purpose? If yes, could you please advise the scheme because I did not find that in the user manual.

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消光比メータ

ERM100の使用例

使用例：PMアライメント

一般的な使用例

狭帯域光源でのER測定