M*g
2 楼
一开始不准备租office，想把公司的地址直接注册为apt的地址，货物也存放在家里，
不知道这么做有没有不妥，需不需要去city，county，state或者apt的office申请一下
之类的？
不知道这么做有没有不妥，需不需要去city，county，state或者apt的office申请一下
之类的？
w*1
3 楼
谢谢啦！
S*t
4 楼
在春天到来以前
那条小河干涸了
小松鼠却在这个时候醒过来
它擦去嘴角的口水
揉乱额前的头发
四周张望一下
只是轻轻一跳
就跳出相框 --- 消失了
那条小河干涸了
小松鼠却在这个时候醒过来
它擦去嘴角的口水
揉乱额前的头发
四周张望一下
只是轻轻一跳
就跳出相框 --- 消失了
d*e
5 楼
UML是不是忽悠？那些东西难道不是我们大二的时候就学过的吗？
XML是不是忽悠？它的功能是不是和CSV差不多？
让穷人上互联网消灭贫困，让小孩用电脑提高学习成绩，怎么越听越不靠谱啊？
XML是不是忽悠？它的功能是不是和CSV差不多？
让穷人上互联网消灭贫困，让小孩用电脑提高学习成绩，怎么越听越不靠谱啊？
M*r
6 楼
【 以下文字转载自 LosAngeles 讨论区 】
发信人: Modeler ((Balance)), 信区: LosAngeles
标 题: Presto!
发信站: BBS 未名空间站 (Tue Apr 21 22:20:06 2009)
http://www.prestomypc.com/
http://www.youtube.com/watch?v=tF9alxLqR7c&feature=related
http://www.youtube.com/watch?v=nfzbFBAWduQ
发信人: Modeler ((Balance)), 信区: LosAngeles
标 题: Presto!
发信站: BBS 未名空间站 (Tue Apr 21 22:20:06 2009)
http://www.prestomypc.com/
http://www.youtube.com/watch?v=tF9alxLqR7c&feature=related
http://www.youtube.com/watch?v=nfzbFBAWduQ
mw
7 楼
what i want to build is:
class My{
public:
My(const T& t_instance){
local_t <== t_instance
}
void doSomething()
{
local_T->doIt();
}
private:
member local_T;
// need to have a reference/pointer/whatever that can access the T instance
within the class
};
怎么样才能让一个成员变量保存一个const reference呢？
有没有比较经典的解决办法？
谢谢
class My{
public:
My(const T& t_instance){
local_t <== t_instance
}
void doSomething()
{
local_T->doIt();
}
private:
member local_T;
// need to have a reference/pointer/whatever that can access the T instance
within the class
};
怎么样才能让一个成员变量保存一个const reference呢？
有没有比较经典的解决办法？
谢谢
s*9
8 楼
在申请internship时遇到这个问题 Do you require U.S. work authorization (for
example, H-1B/TN visa) to begin employment with XXX?
这个问题是指问正式工作还是问intern时期是否需要work authorization,我知道很可
能是指被录用后,不过还是怕弄错了.谢谢.
example, H-1B/TN visa) to begin employment with XXX?
这个问题是指问正式工作还是问intern时期是否需要work authorization,我知道很可
能是指被录用后,不过还是怕弄错了.谢谢.
c*k
9 楼
就是在SOI wafer(0.75um Si and 1.0um SiO2)上设计一个单模的Ridge waveguide.用
经典公式近似了一下，参数如下：
Width: 1.5um, total waveguide height: 0.75um, etching depth: 0.1um. 所以，
Slab height: 0.65um
但是想用设计软件验证一下，实验室有Rsoft CAD photonic suite, 结果请见图：支持
N多mode, 这个Rsoft总是把Slab也当成波导的一部分，怎么办，是软件参数设置的不对
吗？谢谢
经典公式近似了一下，参数如下：
Width: 1.5um, total waveguide height: 0.75um, etching depth: 0.1um. 所以，
Slab height: 0.65um
但是想用设计软件验证一下，实验室有Rsoft CAD photonic suite, 结果请见图：支持
N多mode, 这个Rsoft总是把Slab也当成波导的一部分，怎么办，是软件参数设置的不对
吗？谢谢
S*I
10 楼
应该是你
【在 c*******g 的大作中提到】
: 我sublease房子给别人
: 应该是我付sublease fee还是新进来的人付啊？
: 3x
【在 c*******g 的大作中提到】
: 我sublease房子给别人
: 应该是我付sublease fee还是新进来的人付啊？
: 3x
e*a
11 楼
办理营业执照的时候，市政府的Zoning部门可能要审查一下，如果没有问题，就可以。
【在 M*********g 的大作中提到】
: 一开始不准备租office，想把公司的地址直接注册为apt的地址，货物也存放在家里，
: 不知道这么做有没有不妥，需不需要去city，county，state或者apt的office申请一下
: 之类的？
【在 M*********g 的大作中提到】
: 一开始不准备租office，想把公司的地址直接注册为apt的地址，货物也存放在家里，
: 不知道这么做有没有不妥，需不需要去city，county，state或者apt的office申请一下
: 之类的？
f*n
12 楼
出入境来说可以。但是如果坐飞机航空公司会有什么要求就不知道了。
h*t
13 楼
春天尚早呢，大雪将来。。。
h*8
14 楼
还以为进错版了：）
a*i
15 楼
That is Linux?
t*t
16 楼
you may declare const T& or const T*. for const T&, you must initialize it
in the initializer list for all constructors.
【在 mw 的大作中提到】
: what i want to build is:
: class My{
: public:
: My(const T& t_instance){
: local_t <== t_instance
: }
: void doSomething()
: {
: local_T->doIt();
: }
in the initializer list for all constructors.
【在 mw 的大作中提到】
: what i want to build is:
: class My{
: public:
: My(const T& t_instance){
: local_t <== t_instance
: }
: void doSomething()
: {
: local_T->doIt();
: }
G*u
17 楼
你不需要任何形式的sponsorship来做这个实习 用cpt或者opt就可以 这里你可以填no
j*y
18 楼
把基模的照片啥的也发上来看看
【在 c******k 的大作中提到】
: 就是在SOI wafer(0.75um Si and 1.0um SiO2)上设计一个单模的Ridge waveguide.用
: 经典公式近似了一下，参数如下：
: Width: 1.5um, total waveguide height: 0.75um, etching depth: 0.1um. 所以，
: Slab height: 0.65um
: 但是想用设计软件验证一下，实验室有Rsoft CAD photonic suite, 结果请见图：支持
: N多mode, 这个Rsoft总是把Slab也当成波导的一部分，怎么办，是软件参数设置的不对
: 吗？谢谢
【在 c******k 的大作中提到】
: 就是在SOI wafer(0.75um Si and 1.0um SiO2)上设计一个单模的Ridge waveguide.用
: 经典公式近似了一下，参数如下：
: Width: 1.5um, total waveguide height: 0.75um, etching depth: 0.1um. 所以，
: Slab height: 0.65um
: 但是想用设计软件验证一下，实验室有Rsoft CAD photonic suite, 结果请见图：支持
: N多mode, 这个Rsoft总是把Slab也当成波导的一部分，怎么办，是软件参数设置的不对
: 吗？谢谢
S*w
19 楼
it's up to you guys
【在 c*******g 的大作中提到】
: 我sublease房子给别人
: 应该是我付sublease fee还是新进来的人付啊？
: 3x
【在 c*******g 的大作中提到】
: 我sublease房子给别人
: 应该是我付sublease fee还是新进来的人付啊？
: 3x
B*t
20 楼
你们county可能会要你提供你房东的许可文件/信件。
wh
21 楼
我以为是包子帖……以为说抢包子要讲timing，很激动地以为我赶上了好timing...
【在 S*******t 的大作中提到】
: 在春天到来以前
: 那条小河干涸了
: 小松鼠却在这个时候醒过来
: 它擦去嘴角的口水
: 揉乱额前的头发
: 四周张望一下
: 只是轻轻一跳
: 就跳出相框 --- 消失了
【在 S*******t 的大作中提到】
: 在春天到来以前
: 那条小河干涸了
: 小松鼠却在这个时候醒过来
: 它擦去嘴角的口水
: 揉乱额前的头发
: 四周张望一下
: 只是轻轻一跳
: 就跳出相框 --- 消失了
M*u
22 楼
uml是忽悠
xml还好吧
【在 d******e 的大作中提到】
: UML是不是忽悠？那些东西难道不是我们大二的时候就学过的吗？
: XML是不是忽悠？它的功能是不是和CSV差不多？
: 让穷人上互联网消灭贫困，让小孩用电脑提高学习成绩，怎么越听越不靠谱啊？
xml还好吧
【在 d******e 的大作中提到】
: UML是不是忽悠？那些东西难道不是我们大二的时候就学过的吗？
: XML是不是忽悠？它的功能是不是和CSV差不多？
: 让穷人上互联网消灭贫困，让小孩用电脑提高学习成绩，怎么越听越不靠谱啊？
e*e
23 楼
用linux的内核居然要收费？
s*9
24 楼
谢谢
c*k
25 楼
好吧，请看
【在 j**y 的大作中提到】
: 把基模的照片啥的也发上来看看
【在 j**y 的大作中提到】
: 把基模的照片啥的也发上来看看
z*f
26 楼
真的要付这个费吗？我这两天也面临这个问题，还想着怎么不给才好？
b*o
27 楼
normally no,
go read your lease paper
【在 M*********g 的大作中提到】
: 一开始不准备租office，想把公司的地址直接注册为apt的地址，货物也存放在家里，
: 不知道这么做有没有不妥，需不需要去city，county，state或者apt的office申请一下
: 之类的？
go read your lease paper
【在 M*********g 的大作中提到】
: 一开始不准备租office，想把公司的地址直接注册为apt的地址，货物也存放在家里，
: 不知道这么做有没有不妥，需不需要去city，county，state或者apt的office申请一下
: 之类的？
l*u
28 楼
有松鼠的前传和后续么
【在 S*******t 的大作中提到】
: 在春天到来以前
: 那条小河干涸了
: 小松鼠却在这个时候醒过来
: 它擦去嘴角的口水
: 揉乱额前的头发
: 四周张望一下
: 只是轻轻一跳
: 就跳出相框 --- 消失了
【在 S*******t 的大作中提到】
: 在春天到来以前
: 那条小河干涸了
: 小松鼠却在这个时候醒过来
: 它擦去嘴角的口水
: 揉乱额前的头发
: 四周张望一下
: 只是轻轻一跳
: 就跳出相框 --- 消失了
h*i
29 楼
不是你生活在忽悠的时代，而是你入了一个忽悠的门。
Computer Science就是一个忽悠。用Herbert Simon的话来说，就是所谓的“the science of artificial"，土话翻译就叫“玩虚的科学”。你祖师爷都这么说了，这能不忽悠么？
CS不忽悠的东西都是别的学科的东西。呵呵。
【在 d******e 的大作中提到】
: UML是不是忽悠？那些东西难道不是我们大二的时候就学过的吗？
: XML是不是忽悠？它的功能是不是和CSV差不多？
: 让穷人上互联网消灭贫困，让小孩用电脑提高学习成绩，怎么越听越不靠谱啊？
Computer Science就是一个忽悠。用Herbert Simon的话来说，就是所谓的“the science of artificial"，土话翻译就叫“玩虚的科学”。你祖师爷都这么说了，这能不忽悠么？
CS不忽悠的东西都是别的学科的东西。呵呵。
【在 d******e 的大作中提到】
: UML是不是忽悠？那些东西难道不是我们大二的时候就学过的吗？
: XML是不是忽悠？它的功能是不是和CSV差不多？
: 让穷人上互联网消灭贫困，让小孩用电脑提高学习成绩，怎么越听越不靠谱啊？
w*p
30 楼
Run slab mode analysis first (no ridge shape), find the 1st order mode Nref
of slab mode.
When you simulate the slab with ridge, use the above index as the Nmin to
make sure the slab mode will not be included.
【在 c******k 的大作中提到】
: 就是在SOI wafer(0.75um Si and 1.0um SiO2)上设计一个单模的Ridge waveguide.用
: 经典公式近似了一下，参数如下：
: Width: 1.5um, total waveguide height: 0.75um, etching depth: 0.1um. 所以，
: Slab height: 0.65um
: 但是想用设计软件验证一下，实验室有Rsoft CAD photonic suite, 结果请见图：支持
: N多mode, 这个Rsoft总是把Slab也当成波导的一部分，怎么办，是软件参数设置的不对
: 吗？谢谢
of slab mode.
When you simulate the slab with ridge, use the above index as the Nmin to
make sure the slab mode will not be included.
【在 c******k 的大作中提到】
: 就是在SOI wafer(0.75um Si and 1.0um SiO2)上设计一个单模的Ridge waveguide.用
: 经典公式近似了一下，参数如下：
: Width: 1.5um, total waveguide height: 0.75um, etching depth: 0.1um. 所以，
: Slab height: 0.65um
: 但是想用设计软件验证一下，实验室有Rsoft CAD photonic suite, 结果请见图：支持
: N多mode, 这个Rsoft总是把Slab也当成波导的一部分，怎么办，是软件参数设置的不对
: 吗？谢谢
z*f
31 楼
我的情况是，到走时交钥匙就行了，只有100元的deposit。可是apartment问我要200的
sublease fee，很郁闷，反正也找到人继续合同了，又没耽误他啥事，交sublease fee
觉得很受委屈。
sublease fee，很郁闷，反正也找到人继续合同了，又没耽误他啥事，交sublease fee
觉得很受委屈。
A*u
32 楼
说的是who啊
w*o
33 楼
赞
optibpm里面能这么搞么？我以前也有过这个问题，没解决好
Nref
【在 w*******p 的大作中提到】
: Run slab mode analysis first (no ridge shape), find the 1st order mode Nref
: of slab mode.
: When you simulate the slab with ridge, use the above index as the Nmin to
: make sure the slab mode will not be included.
optibpm里面能这么搞么？我以前也有过这个问题，没解决好
Nref
【在 w*******p 的大作中提到】
: Run slab mode analysis first (no ridge shape), find the 1st order mode Nref
: of slab mode.
: When you simulate the slab with ridge, use the above index as the Nmin to
: make sure the slab mode will not be included.
c*r
34 楼
我们这里没有subleas fee。
j*y
35 楼
好诗
w*p
36 楼
I didn't use this software before, so I don't know, Rsoft is very popular in
this area...
【在 w********o 的大作中提到】
: 赞
: optibpm里面能这么搞么？我以前也有过这个问题，没解决好
:
: Nref
this area...
【在 w********o 的大作中提到】
: 赞
: optibpm里面能这么搞么？我以前也有过这个问题，没解决好
:
: Nref
c*l
37 楼
ice age?
【在 l*******u 的大作中提到】
: 有松鼠的前传和后续么
【在 l*******u 的大作中提到】
: 有松鼠的前传和后续么
c*k
38 楼
请问run 这个slab waveguide 的slab mode时的slab宽度设置多少合适？
不同的slab宽度的1st order slab mode的Neff 还不一样啊，
比如现在设成
20um width: Neff=3.363936（1st order slab mode）
10um width: Neff=3.363858（1st order slab mode）
Nref
【在 w*******p 的大作中提到】
: Run slab mode analysis first (no ridge shape), find the 1st order mode Nref
: of slab mode.
: When you simulate the slab with ridge, use the above index as the Nmin to
: make sure the slab mode will not be included.
不同的slab宽度的1st order slab mode的Neff 还不一样啊，
比如现在设成
20um width: Neff=3.363936（1st order slab mode）
10um width: Neff=3.363858（1st order slab mode）
Nref
【在 w*******p 的大作中提到】
: Run slab mode analysis first (no ridge shape), find the 1st order mode Nref
: of slab mode.
: When you simulate the slab with ridge, use the above index as the Nmin to
: make sure the slab mode will not be included.
h*t
39 楼
是冬眠宣言吧
w*p
40 楼
It doesn't matter that much, you can the width which is close to your real s
ituation.
Use this 0th mode of the slab as Nmin when you simulate ridge structure, the
simulation will only show the fundamental mode of the ridge structure.
【在 c******k 的大作中提到】
: 请问run 这个slab waveguide 的slab mode时的slab宽度设置多少合适？
: 不同的slab宽度的1st order slab mode的Neff 还不一样啊，
: 比如现在设成
: 20um width: Neff=3.363936（1st order slab mode）
: 10um width: Neff=3.363858（1st order slab mode）
:
: Nref
ituation.
Use this 0th mode of the slab as Nmin when you simulate ridge structure, the
simulation will only show the fundamental mode of the ridge structure.
【在 c******k 的大作中提到】
: 请问run 这个slab waveguide 的slab mode时的slab宽度设置多少合适？
: 不同的slab宽度的1st order slab mode的Neff 还不一样啊，
: 比如现在设成
: 20um width: Neff=3.363936（1st order slab mode）
: 10um width: Neff=3.363858（1st order slab mode）
:
: Nref
M*8
41 楼
打头黄叶忽飘坠，知是框中松鼠来。。。。。。
c*k
42 楼
Many thanks for your reply.
I realize that you mean I should calculate Neff of 0th mode of the 2D slab
waveguide. In this case, it does not matter the slab width, since the
confinement only happen in the vertical direction, namely 0.65um.
However, if I intend to set a width value for this slab waveguide, this slab
waveguide actually become a strip waveguide (still 3D structure). So the
Neff of a fundamental mode will change with the slab width.
My understanding is correct?
s
the
【在 w*******p 的大作中提到】
: It doesn't matter that much, you can the width which is close to your real s
: ituation.
: Use this 0th mode of the slab as Nmin when you simulate ridge structure, the
: simulation will only show the fundamental mode of the ridge structure.
I realize that you mean I should calculate Neff of 0th mode of the 2D slab
waveguide. In this case, it does not matter the slab width, since the
confinement only happen in the vertical direction, namely 0.65um.
However, if I intend to set a width value for this slab waveguide, this slab
waveguide actually become a strip waveguide (still 3D structure). So the
Neff of a fundamental mode will change with the slab width.
My understanding is correct?
s
the
【在 w*******p 的大作中提到】
: It doesn't matter that much, you can the width which is close to your real s
: ituation.
: Use this 0th mode of the slab as Nmin when you simulate ridge structure, the
: simulation will only show the fundamental mode of the ridge structure.
w*p
43 楼
Yes, the slab w/o ridge is still a 3D structure, assuming your cross section
is in XY plane, progation direction is Z.
If you use different widths (X direction), the calculated Neff is slightly d
ifferent, which has been verified by your calculation.
【在 c******k 的大作中提到】
: Many thanks for your reply.
: I realize that you mean I should calculate Neff of 0th mode of the 2D slab
: waveguide. In this case, it does not matter the slab width, since the
: confinement only happen in the vertical direction, namely 0.65um.
: However, if I intend to set a width value for this slab waveguide, this slab
: waveguide actually become a strip waveguide (still 3D structure). So the
: Neff of a fundamental mode will change with the slab width.
: My understanding is correct?
:
: s
is in XY plane, progation direction is Z.
If you use different widths (X direction), the calculated Neff is slightly d
ifferent, which has been verified by your calculation.
【在 c******k 的大作中提到】
: Many thanks for your reply.
: I realize that you mean I should calculate Neff of 0th mode of the 2D slab
: waveguide. In this case, it does not matter the slab width, since the
: confinement only happen in the vertical direction, namely 0.65um.
: However, if I intend to set a width value for this slab waveguide, this slab
: waveguide actually become a strip waveguide (still 3D structure). So the
: Neff of a fundamental mode will change with the slab width.
: My understanding is correct?
:
: s
c*k
44 楼
You help me a lot! Two more questions:
1.The calculated Neff of a 0th slab mode with various widths as follows:
1.6um: 3.364379
10um: 3.363858
20um: 3.363936
50um: 3.364155
100um: 3.364166
You suggest me to choose a slab width that is close to a real situation.But
in fact we can consider the slab width to go infinite.So right now I have to
choose Neff with 3.364 as an average value. Any comments about this value?
2. If I keep other parameters same for a ridge waveguide, but just change a
ridg
【在 w*******p 的大作中提到】
: It doesn't matter that much, you can the width which is close to your real s
: ituation.
: Use this 0th mode of the slab as Nmin when you simulate ridge structure, the
: simulation will only show the fundamental mode of the ridge structure.
1.The calculated Neff of a 0th slab mode with various widths as follows:
1.6um: 3.364379
10um: 3.363858
20um: 3.363936
50um: 3.364155
100um: 3.364166
You suggest me to choose a slab width that is close to a real situation.But
in fact we can consider the slab width to go infinite.So right now I have to
choose Neff with 3.364 as an average value. Any comments about this value?
2. If I keep other parameters same for a ridge waveguide, but just change a
ridg
【在 w*******p 的大作中提到】
: It doesn't matter that much, you can the width which is close to your real s
: ituation.
: Use this 0th mode of the slab as Nmin when you simulate ridge structure, the
: simulation will only show the fundamental mode of the ridge structure.
w*p
45 楼
1. This Neff is ok to be used as Nmin when you calculate ridge structure.
2. Marcatili has a famous paper on this topic, you may want to read it. The formular is for approximate calculation, not accurate. I am not sure if Rsoft uses very fine meshes near boundaries, if you say "the width can be up to 2.5um", you really want to make sure you are in the middle of some safe region, which allows calculation/process tolerance. For example, if the Rsoft calculation and formular give you different sing
【在 c******k 的大作中提到】
: You help me a lot! Two more questions:
: 1.The calculated Neff of a 0th slab mode with various widths as follows:
: 1.6um: 3.364379
: 10um: 3.363858
: 20um: 3.363936
: 50um: 3.364155
: 100um: 3.364166
: You suggest me to choose a slab width that is close to a real situation.But
: in fact we can consider the slab width to go infinite.So right now I have to
: choose Neff with 3.364 as an average value. Any comments about this value?
2. Marcatili has a famous paper on this topic, you may want to read it. The formular is for approximate calculation, not accurate. I am not sure if Rsoft uses very fine meshes near boundaries, if you say "the width can be up to 2.5um", you really want to make sure you are in the middle of some safe region, which allows calculation/process tolerance. For example, if the Rsoft calculation and formular give you different sing
【在 c******k 的大作中提到】
: You help me a lot! Two more questions:
: 1.The calculated Neff of a 0th slab mode with various widths as follows:
: 1.6um: 3.364379
: 10um: 3.363858
: 20um: 3.363936
: 50um: 3.364155
: 100um: 3.364166
: You suggest me to choose a slab width that is close to a real situation.But
: in fact we can consider the slab width to go infinite.So right now I have to
: choose Neff with 3.364 as an average value. Any comments about this value?
c*k
46 楼
Another thing in Rsoft BeamProp simulation that really bother me is how to
choose right compute step sizes for XYZ directions.
For example, to calculate the Neff of 0th order mode in a slad waveguide,
say 15um slab width, keeping a same X domain as -50um~50um for all the cases
. 0.05 step size will have Neff=3.360727, and 0.02 step size will produce 3.
363853, and 0.01 size will lead to 3.364009. Smaller compute size will
always have a better accurate result?? But take too much time.
Could you
【在 w*******p 的大作中提到】
: It doesn't matter that much, you can the width which is close to your real s
: ituation.
: Use this 0th mode of the slab as Nmin when you simulate ridge structure, the
: simulation will only show the fundamental mode of the ridge structure.
choose right compute step sizes for XYZ directions.
For example, to calculate the Neff of 0th order mode in a slad waveguide,
say 15um slab width, keeping a same X domain as -50um~50um for all the cases
. 0.05 step size will have Neff=3.360727, and 0.02 step size will produce 3.
363853, and 0.01 size will lead to 3.364009. Smaller compute size will
always have a better accurate result?? But take too much time.
Could you
【在 w*******p 的大作中提到】
: It doesn't matter that much, you can the width which is close to your real s
: ituation.
: Use this 0th mode of the slab as Nmin when you simulate ridge structure, the
: simulation will only show the fundamental mode of the ridge structure.
w*p
47 楼
Usually the smaller step, the better accuracy, but more time-consuming.
Rsoft doesn't support localized mesh reshape, which means you can make the
meshes smaller in some critical region. So you have to live with that.
This is one of the software calculation tolerances I mentioned to you in
previous message, if the difference is within a certain range (for example,
diff steps give 0.1% difference in Neff), you can choose the bigger step to
save time.
Think about this, the refractive index you use
【在 c******k 的大作中提到】
: Another thing in Rsoft BeamProp simulation that really bother me is how to
: choose right compute step sizes for XYZ directions.
: For example, to calculate the Neff of 0th order mode in a slad waveguide,
: say 15um slab width, keeping a same X domain as -50um~50um for all the cases
: . 0.05 step size will have Neff=3.360727, and 0.02 step size will produce 3.
: 363853, and 0.01 size will lead to 3.364009. Smaller compute size will
: always have a better accurate result?? But take too much time.
: Could you
Rsoft doesn't support localized mesh reshape, which means you can make the
meshes smaller in some critical region. So you have to live with that.
This is one of the software calculation tolerances I mentioned to you in
previous message, if the difference is within a certain range (for example,
diff steps give 0.1% difference in Neff), you can choose the bigger step to
save time.
Think about this, the refractive index you use
【在 c******k 的大作中提到】
: Another thing in Rsoft BeamProp simulation that really bother me is how to
: choose right compute step sizes for XYZ directions.
: For example, to calculate the Neff of 0th order mode in a slad waveguide,
: say 15um slab width, keeping a same X domain as -50um~50um for all the cases
: . 0.05 step size will have Neff=3.360727, and 0.02 step size will produce 3.
: 363853, and 0.01 size will lead to 3.364009. Smaller compute size will
: always have a better accurate result?? But take too much time.
: Could you
w*o
48 楼
有时候可能不一定step越小越好,会有round-off error.模拟的东西感觉结果大概定性
就行了,反正不可能跟实验100%吻合.可以试试看用不同的step,看结果啥时候开始
converge
,
to
.1
【在 w*******p 的大作中提到】
: Usually the smaller step, the better accuracy, but more time-consuming.
: Rsoft doesn't support localized mesh reshape, which means you can make the
: meshes smaller in some critical region. So you have to live with that.
: This is one of the software calculation tolerances I mentioned to you in
: previous message, if the difference is within a certain range (for example,
: diff steps give 0.1% difference in Neff), you can choose the bigger step to
: save time.
: Think about this, the refractive index you use
就行了,反正不可能跟实验100%吻合.可以试试看用不同的step,看结果啥时候开始
converge
,
to
.1
【在 w*******p 的大作中提到】
: Usually the smaller step, the better accuracy, but more time-consuming.
: Rsoft doesn't support localized mesh reshape, which means you can make the
: meshes smaller in some critical region. So you have to live with that.
: This is one of the software calculation tolerances I mentioned to you in
: previous message, if the difference is within a certain range (for example,
: diff steps give 0.1% difference in Neff), you can choose the bigger step to
: save time.
: Think about this, the refractive index you use
w*p
49 楼
Good point!
【在 w********o 的大作中提到】
: 有时候可能不一定step越小越好,会有round-off error.模拟的东西感觉结果大概定性
: 就行了,反正不可能跟实验100%吻合.可以试试看用不同的step,看结果啥时候开始
: converge
:
: ,
: to
: .1
【在 w********o 的大作中提到】
: 有时候可能不一定step越小越好,会有round-off error.模拟的东西感觉结果大概定性
: 就行了,反正不可能跟实验100%吻合.可以试试看用不同的step,看结果啥时候开始
: converge
:
: ,
: to
: .1
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